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Revision 5690 - Directory Listing
Modified Wed Jun 11 19:17:30 2008 UTC (11 years, 6 months ago) by apizer
correct syntax error in BEGIN that caused a warning in Perl 5.10

Revision 5684 - Directory Listing
Modified Sat May 24 23:05:02 2008 UTC (11 years, 6 months ago) by dpvc
Moved previous_equivalence_message filter to Formula object directly,
so it is no longer needed in the FUNCTION_CMP macro itself.

Revision 5676 - Directory Listing
Modified Thu May 22 19:15:59 2008 UTC (11 years, 6 months ago) by gage
minor changes to help with debugging.

Revision 5667 - Directory Listing
Modified Mon May 12 00:50:24 2008 UTC (11 years, 7 months ago) by gage
Uploading changes in the AppletObjects.pl and Applet.pm modules.

Revision 5662 - Directory Listing
Modified Mon May 5 17:24:46 2008 UTC (11 years, 7 months ago) by gage
fix method of setting debug

Revision 5661 - Directory Listing
Modified Mon May 5 16:44:11 2008 UTC (11 years, 7 months ago) by gage
Latest improvements for the Applet.pm and AppletObjects.pl files

Revision 5639 - Directory Listing
Modified Sat Apr 26 21:00:02 2008 UTC (11 years, 7 months ago) by gage
define ans_label slot in a new AnswerHash to be undefined.

Revision 5638 - Directory Listing
Modified Sat Apr 26 20:52:18 2008 UTC (11 years, 7 months ago) by gage
provide ans_label for the current answer being evaluated to
answer evaluator subroutines as well to AnswerEvaluator objects.

Revision 5625 - Directory Listing
Modified Wed Mar 26 02:42:20 2008 UTC (11 years, 8 months ago) by gage
Added more debugging code

Revision 5624 - Directory Listing
Modified Wed Mar 26 01:25:52 2008 UTC (11 years, 8 months ago) by gage
Modified method in which parameters are passed to
flash applets (uses   FlashVars   parameter )

Revision 5622 - Directory Listing
Modified Tue Mar 25 21:59:06 2008 UTC (11 years, 8 months ago) by gage
cosmetic changes
some corrections on typos for setState subroutines.

Revision 5619 - Directory Listing
Modified Sun Mar 16 14:39:39 2008 UTC (11 years, 8 months ago) by gage
New version of Applet.pm and AppletObjects.pl that supports both flashnew FlashApplet();
and java applets
new JavaApplet();

see pod docs in those two files for more details.

Revision 5607 - Directory Listing
Modified Thu Jan 31 14:26:45 2008 UTC (11 years, 10 months ago) by dpvc
Fixed differentiation of log() function (it used to give an error
about undefined function D_ln).

Revision 5600 - Directory Listing
Modified Wed Jan 16 22:51:52 2008 UTC (11 years, 10 months ago) by dpvc
Make sure that real and complex values have their contexts changed if
one is specified in the call to new().

Revision 5595 - Directory Listing
Modified Thu Dec 20 00:08:17 2007 UTC (11 years, 11 months ago) by gage
remove \ensuremath

from around the output.  I don't think it will work properly (although it might have worked with LatexToHTML)

Revision 5594 - Directory Listing
Modified Thu Dec 20 00:04:39 2007 UTC (11 years, 11 months ago) by gage
Updated documentation.  Fixed a hard coded reference in the DEFAULT_OBJECT_TEXT.

Added getQE(name) for referencing HTML elements in PG questions.

Added listQuestionElements()  for discovering the names/ids of input HTML elements in PG questions.

Revision 5592 - Directory Listing
Modified Sun Dec 2 14:19:50 2007 UTC (12 years ago) by dpvc
Fixed a problem where intervals minus sets containing more than one
point were not being handled properly.

Revision 5591 - Directory Listing
Modified Mon Nov 26 17:58:28 2007 UTC (12 years ago) by glarose
Add mg as a mass unit.  Hopefully the fact that this wasn't here before
is an oddity rather than indicating that I'm screwing something up.

Revision 5590 - Directory Listing
Modified Tue Nov 20 15:04:47 2007 UTC (12 years ago) by glarose
Make VectorField plotting honor setting of x_steps and y_steps.

Revision 5589 - Directory Listing
Modified Thu Nov 15 12:31:50 2007 UTC (12 years ago) by dpvc
When two sets are added, combine them rather than form a union.
(This allows Inequailities context to report errors better when
student answers are of the form x=a or x=b.)

Revision 5588 - Directory Listing
Modified Thu Nov 15 12:30:47 2007 UTC (12 years ago) by dpvc
Do the reduction check on sets when they are compared (to see if there
are repeated values, for example).

Revision 5583 - Directory Listing
Modified Tue Nov 6 16:47:19 2007 UTC (12 years, 1 month ago) by gage
Added some further documentation pointing out the workaround to make
flash objects embedded within forms (as all objects in a PG problem are)
work with IE.

-- Mike

Revision 5581 - Directory Listing
Modified Tue Nov 6 16:23:33 2007 UTC (12 years, 1 month ago) by dpvc
When (-x)*y or x*(-y) reductions are performed, don't print extra
parentheses in string and TeX version.  I.e., display as -xy not
-(xy).  This makes reduction with polynomials work better.

Revision 5578 - Directory Listing
Modified Mon Nov 5 16:45:33 2007 UTC (12 years, 1 month ago) by gage
This version of Applet.pm now works with IE.

More documentation and features are forth coming
but it is ready for some experimental use by those
developing Applets.

Revision 5574 - Directory Listing
Modified Tue Oct 30 15:57:04 2007 UTC (12 years, 1 month ago) by gage
Preliminary version of Applet.pm which will provide a uniform interface
for including FlashApplets (eventually other applets) in a webwork
problem.   This remains experimental so the interface will probably
change.

Revision 5535 - Directory Listing
Modified Wed Sep 26 02:15:29 2007 UTC (12 years, 2 months ago) by dpvc
Localize the $ans variable (rather than incorrectly using a closure).

Revision 5520 - Directory Listing
Modified Mon Sep 24 22:33:16 2007 UTC (12 years, 2 months ago) by dpvc
Update the List() object to not add "(" and ")" around the list unless
they are explicitly entered by the author.  This prevents extraneous
parentheses from being introduced into the problem text that the
author hadn't expected.

Parentheses now are added only for nested lists, as in
List(1,List(2,3)), which will display as "1, (2, 3)", not "1, 2, 3".

Revision 5517 - Directory Listing
Modified Thu Sep 20 18:02:24 2007 UTC (12 years, 2 months ago) by dpvc
Make adaptive parameters try again if they fail to be found the first
time (Gavin has found cases where the random points cause the
coefficient matrix to be singular, so a second try should resolve the
problem).

Revision 5511 - Directory Listing
Modified Sat Sep 15 14:45:22 2007 UTC (12 years, 2 months ago) by dpvc
Cosmetic changes.

Revision 5510 - Directory Listing
Modified Sat Sep 15 14:44:03 2007 UTC (12 years, 2 months ago) by dpvc
Reduce -0 to 0.

Revision 5509 - Directory Listing
Modified Sat Sep 15 00:56:51 2007 UTC (12 years, 2 months ago) by dpvc
Formula objects and Context objects contain reference loops, which
prevent them from being freed properly by perl when they are no longer
needed.  This is a source of an important memory leak in WeBWorK.  The
problem has been fixed by using Scalar::Util::weaken for these
recursive references, so these objects can be freed properly when they
go out of scope.  This should cause an improvement in the memory usage
of the httpd child processes.

Revision 5485 - Directory Listing
Modified Tue Sep 11 14:07:51 2007 UTC (12 years, 3 months ago) by dpvc
A couple of syntax issues.

Revision 5475 - Directory Listing
Modified Sat Sep 8 22:54:17 2007 UTC (12 years, 3 months ago) by dpvc
Report error messages correctly when ijk notation is involved and
ijkAnyDimension is set.

Revision 5474 - Directory Listing
Modified Sat Sep 8 22:30:40 2007 UTC (12 years, 3 months ago) by dpvc
Use ijkAnyDimension in the check for parallel vectors as well.

Revision 5473 - Directory Listing
Modified Sat Sep 8 22:27:02 2007 UTC (12 years, 3 months ago) by dpvc
Had the inequality going the wrong way.  OOPS!

Revision 5472 - Directory Listing
Modified Sat Sep 8 22:24:06 2007 UTC (12 years, 3 months ago) by dpvc
Make vectors that are creates using ijk notation remain in ijk
notation when displayed.  (This is easy now that objects produced by
combining others inherit the parent objects' flags.)

Added another context flag (ijkAnyDimension) that controls whether
vectors in ijk notation will conform to whatever dimension is used by
the vector they are being compared to.  When set, i+2*j will equal
<1,2> even though i and j are vectors in 3-space.  The value of
ijkAnyDimension is 1 by default.

This eliminates the need for the Vector2D context.

Revision 5471 - Directory Listing
Modified Sat Sep 8 21:46:52 2007 UTC (12 years, 3 months ago) by dpvc
Make copies of the components rather than just copying the pointers.

Revision 5469 - Directory Listing
Modified Sat Sep 8 21:35:21 2007 UTC (12 years, 3 months ago) by dpvc
Removed an experiment that I accidentally left in during the last commit.

Revision 5468 - Directory Listing
Modified Sat Sep 8 21:33:53 2007 UTC (12 years, 3 months ago) by dpvc
The make() method now inherits all the settings of the parent object,
so that flags set by the user (e.g., tolerances, periods, and so on)
will be passed on as new objects are created.  For example, in

     $x = Real(1)=>with(tolerance=>.0001);
     $y = sin($x);

$y will also have tolerance set to .0001.

This also applies to binary operations, where the result will now
inherit all the values of either operand, with the left-hand operand
taking precedence when they both have a flag set but to different
values.

This is a significant change, and there may be unforeseen side effects
that I'll have to take care of as they appear.  It passes my test
suite, however, so I'm hoping they will be limited.

Revision 5467 - Directory Listing
Modified Sat Sep 8 21:25:06 2007 UTC (12 years, 3 months ago) by dpvc
Allow interval data to be given in more forms (eg, (a,b,"(",")") in
addition to ("(",a,b,")"), since that is the order that the value()
method returns the data.)

Revision 5464 - Directory Listing
Modified Fri Sep 7 14:18:30 2007 UTC (12 years, 3 months ago) by dpvc
Derivatives of absolute values were leaving out the chain rule when
written as |...| (but not as abs(...)).  The chain rule is built into
the derivatives of function objects automatically, but not of lists,
which is how |...| is implemented (a special form of parentheses), and
so I missed it when adding the derivative in this form.  Argh!

Revision 5462 - Directory Listing
Modified Thu Sep 6 10:36:15 2007 UTC (12 years, 3 months ago) by dpvc
Only try to reduce intervals, sets and unions.  (Don't call isReduced
on objects that don't support it).

Revision 5455 - Directory Listing
Modified Thu Aug 30 02:45:18 2007 UTC (12 years, 3 months ago) by dpvc
Make sure Formula's value() method doesn't produce an error when it
can't extact the separate entries of the formula.

Revision 5454 - Directory Listing
Modified Thu Aug 30 02:38:07 2007 UTC (12 years, 3 months ago) by dpvc
Disassemble Formula's properly when used with multiple variables in
substitute(), etc.  For example:

    $f->substitute(['x','y'] => Formula("xy,x^2-y^2"));

Revision 5453 - Directory Listing
Modified Thu Aug 30 02:20:06 2007 UTC (12 years, 3 months ago) by dpvc
Allow specification of values for multiple variables a once for
eval(), substitute() and so on.  You can use

    $f->eval(['x','y'] => Point(1,2));
or
    $f->eval(['x','y'] => [1,2]);
or
    $P = Point(1,2);
    $f->eval(['x','y'] => $P);

to do the equivalent of

    $f->eval(x=>1,y=>2);

Note that you must use quotes for the variable names and that they
must be enclosed in square brackets, not parentheses, when you supply
more than one variable.  You can combine single with multiple
variables, as in

     $f->eval(['x','y']=>Point(1,2),z=>3);

Revision 5442 - Directory Listing
Modified Tue Aug 28 23:08:44 2007 UTC (12 years, 3 months ago) by gage
Backporting changes from HEAD to rel-2-4-dev

Revision 5439 - Directory Listing
Modified Tue Aug 28 21:53:42 2007 UTC (12 years, 3 months ago) by dpvc
Updated contexts to include a "name" field that at least tracks what
context you started with (though it can be modified and no longer be
the same as the original context).

Remove the individual named variables in the Default.pm file; they are
now available only through the %Parser::Context::Default::context
hash.

Remove the >< and . operators, the <...> parentheses, the norm and
unit functions, and the i, j, and k constants from the Point context.
So the Point context no longer includes vectors and vector
operaterations.

Revision 5436 - Directory Listing
Modified Tue Aug 28 01:30:25 2007 UTC (12 years, 3 months ago) by dpvc
Had the wrong inequality (but since answers won't usually contain
newlines, this won't have affected anyone).

Revision 5433 - Directory Listing
Modified Sun Aug 26 19:05:18 2007 UTC (12 years, 3 months ago) by dpvc
Improve error messages for unreduced unions.

Revision 5432 - Directory Listing
Modified Sun Aug 26 18:53:23 2007 UTC (12 years, 3 months ago) by dpvc
Only try to form intervals from lists that could be intervals when
they are of length 2.

Revision 5431 - Directory Listing
Modified Sun Aug 26 12:14:00 2007 UTC (12 years, 3 months ago) by dpvc
Allow object classes to override their own precedence values.

Revision 5430 - Directory Listing
Modified Sun Aug 26 12:13:12 2007 UTC (12 years, 3 months ago) by dpvc
Had the test reversed in isReduced when returning a boolean rather
than an array (Argh!)

Revision 5429 - Directory Listing
Modified Sun Aug 26 11:56:24 2007 UTC (12 years, 3 months ago) by dpvc
Make sure the constructor creates the interval in the correct context.

Revision 5428 - Directory Listing
Modified Sun Aug 26 03:03:29 2007 UTC (12 years, 3 months ago) by dpvc
Allow Interval constructor to handle more situations.

Revision 5427 - Directory Listing
Modified Sun Aug 26 03:02:06 2007 UTC (12 years, 3 months ago) by dpvc
Minor change (don't need to check for isValue since we are already
assuming that in the previous line).

Revision 5426 - Directory Listing
Modified Sun Aug 26 03:00:59 2007 UTC (12 years, 3 months ago) by dpvc
Add a predefined type structure for intervals.

Revision 5410 - Directory Listing
Modified Fri Aug 24 03:05:07 2007 UTC (12 years, 3 months ago) by dpvc
Use the original when determining what structures to copy.

Revision 5409 - Directory Listing
Modified Fri Aug 24 03:03:55 2007 UTC (12 years, 3 months ago) by dpvc
Use string() rather than stringify() since we don't want the
StringifyAsTeX setting to affect this check.

Revision 5408 - Directory Listing
Modified Fri Aug 24 03:02:54 2007 UTC (12 years, 3 months ago) by dpvc
Load the UNIVERSAL package and make it available to Parser Items and Contexts.

Revision 5405 - Directory Listing
Modified Wed Aug 22 23:38:13 2007 UTC (12 years, 3 months ago) by dpvc
Revamp the isReduced() method for Unions and Sets so that it produces
error indicators in addition to the T/F result.  The answer checker
now uses that to produce more meaningful error messages for students
(in the past it always said "Your union can be produced without
overlaps" even when that was not the actual reason why the union is
not reduced).

Revision 5403 - Directory Listing
Modified Wed Aug 22 23:31:10 2007 UTC (12 years, 3 months ago) by dpvc
Make sure Context's cmpDefaults hash is copied when duplicated.  (Now
that isHash() and so on can be used, this can be improved.)

Revision 5401 - Directory Listing
Modified Wed Aug 22 20:16:26 2007 UTC (12 years, 3 months ago) by dpvc
Allow conversion of error messages after the value substitution has
been performed.  Also provide a subroutine to do more complex
conversion of error messages:

    Context()->{error}{convert} = sub {
      my $message = shift;
      ... manipulate message ...
      return $message;
    }

Revision 5399 - Directory Listing
Modified Wed Aug 22 19:49:36 2007 UTC (12 years, 3 months ago) by dpvc
Allow contexts to override the MathObject constructors separately from
the ones generated by the parser.  That way, you can define Real(),
for example, to produce ScientificNotation, without screwing up the
reals used in the parser itself.

Revision 5396 - Directory Listing
Modified Mon Aug 20 06:35:54 2007 UTC (12 years, 3 months ago) by dpvc
Make sure copy() creates new variables and values hash references (and
any other hash or array refs in the formula).

Revision 5389 - Directory Listing
Modified Sun Aug 19 21:43:37 2007 UTC (12 years, 3 months ago) by dpvc
Only do this translation when not in hardcopy mode (but the answer
checkers aren't called then anyway, so that is probably not ever going
to occur).

Revision 5387 - Directory Listing
Modified Sun Aug 19 21:31:17 2007 UTC (12 years, 3 months ago) by dpvc
Always make units be in \textstyle (in particular, in the preview display).

Revision 5384 - Directory Listing
Modified Sun Aug 19 19:18:18 2007 UTC (12 years, 3 months ago) by dpvc
Allow objects to explicitly DENY being a given type, even if isa()
says they are.

Revision 5383 - Directory Listing
Modified Sun Aug 19 18:07:19 2007 UTC (12 years, 3 months ago) by dpvc
The copy method was not copying all the values from the original
(since it was making a new object from scratch).  We now copy the
complete hash and recursively copy the parse tree.

Revision 5382 - Directory Listing
Modified Sun Aug 19 18:00:48 2007 UTC (12 years, 3 months ago) by dpvc
The overridden with() method was not preserving all the settings in
the Formula.  This has been fixed.

Revision 5377 - Directory Listing
Modified Sun Aug 19 14:41:26 2007 UTC (12 years, 3 months ago) by dpvc
Make sure clear doesn't remove the special 'start' paren that is
required by the Parser class.

Revision 5376 - Directory Listing
Modified Sun Aug 19 03:41:45 2007 UTC (12 years, 3 months ago) by dpvc
Allow formatted answers to include newlines, and convert them to <BR>
so that we can try to improve the layout in the results table.
(Piecewise functions will want this, since they can be very long
otherwise.  Raw matrix entries might want that, too.)

Revision 5375 - Directory Listing
Modified Sun Aug 19 03:39:10 2007 UTC (12 years, 3 months ago) by dpvc
Improved method of looking up the item class so that it will work with
more deeply nested namespaces.

Revision 5369 - Directory Listing
Modified Sun Aug 19 00:30:41 2007 UTC (12 years, 3 months ago) by dpvc
The "undef" in Parser::Context->getCopy(undef,"NAME") is no longer
needed, and will be ignored if provided, but you can now use

    Parser::Context->getCopy("NAME");

which is more reasonable to read.

Revision 5367 - Directory Listing
Modified Sat Aug 18 23:46:02 2007 UTC (12 years, 3 months ago) by dpvc
Include extra parens when they have been requested.

Revision 5364 - Directory Listing
Modified Sat Aug 18 23:34:09 2007 UTC (12 years, 3 months ago) by dpvc
Handle promotion of Parser::Items better when they have been
subclassed, and be sure to initialize the {variables} field.

Revision 5363 - Directory Listing
Modified Sat Aug 18 23:33:05 2007 UTC (12 years, 3 months ago) by dpvc
Added a number of methods to improve the ability to test unknown
values for their types (e.g., isHash, isBlessed, etc), and modified
several of the service routines to use them.

Improved the isValue and related routines to use more sophisticated
methods of determining whether a class is a MathObject.

Made the UNIVERSAL isa() and can() methods available for use from
within the safe compartment.

Some miscellaneous cleanup.

Revision 5362 - Directory Listing
Modified Sat Aug 18 21:47:03 2007 UTC (12 years, 3 months ago) by dpvc
The changes in version 1.81 broke promotion of objects created by hand
through the MathObject constructors since they don't have open and
close explicitly like the parsed versions do.  So check the context
for the default parens for these.

Revision 5356 - Directory Listing
Modified Sat Aug 18 02:47:09 2007 UTC (12 years, 3 months ago) by dpvc
The MultiAnswer object calls cmp_compare() in a non-standard way (in
order to get its checker routine to run inside an eval call, which it
can't do itself since it is not a .pm file, and so is in the safe
compartment).  Recent changes to this routine to take advantage of
MathObjects storing their contexts broke this non-standard usage.  (It
should really be changed so that this hack isn't necessary in the
MultiAnswer object.)

Revision 5349 - Directory Listing
Modified Fri Aug 17 19:40:55 2007 UTC (12 years, 3 months ago) by dpvc
Use the more powerful getFlag method to get the context flag rather
looking in the context directly.

Revision 5348 - Directory Listing
Modified Fri Aug 17 19:37:53 2007 UTC (12 years, 3 months ago) by dpvc
Modified Value::Error so that it works as a method as well as a direct
call.  So you can use Value::Error(), Value->Error() or $mathObj->Error()
to call it.  I probably should change all the Value::Error calls to
Value->Error ones, but may not bother, as there is not much gain in
it and I've gotten pretty used to it the way it is.

Also fixed a typo where the showTraceback flag was not being honored.

Revision 5345 - Directory Listing
Modified Fri Aug 17 16:24:40 2007 UTC (12 years, 3 months ago) by dpvc
Fixed a typo that prevented the flags from the cmp() method from being
accessible to the getFlag() method.  OOPS!

Revision 5331 - Directory Listing
Modified Wed Aug 15 04:10:41 2007 UTC (12 years, 4 months ago) by dpvc
Added a reduce flag for x^1 processing (it was not able to be
disabled before).

Revision 5330 - Directory Listing
Modified Wed Aug 15 04:09:41 2007 UTC (12 years, 4 months ago) by dpvc
Added a Ref() function that returns the reference address (for
checking if two MathObject references are to the identical object).
Without this, the objects would be compared as MathObjects rather than
perl references.

Revision 5323 - Directory Listing
Modified Tue Aug 14 15:57:19 2007 UTC (12 years, 4 months ago) by dpvc
Fixed a problem where Real's were being promoted to NumberWithReals
during the numeric comparison (when units should be ignored).  This
error was a result of the changes made this summer.

[This class should probably be redesigned to implement the overloaded
operators and, in particular, handle the equality check in compare()
rather than an over-ridden cmp_parse.  That would make it possible to
manipulate numbers-with-units via perl code in a natural way, just
like all the other MathObjects.]

Revision 5312 - Directory Listing
Modified Fri Aug 10 20:00:24 2007 UTC (12 years, 4 months ago) by sh002i
forward-port (sh002i): Fix PG_restricted_eval so that no lexicals are
used in the scope of the eval()

Revision 5253 - Directory Listing
Modified Thu Aug 9 06:30:52 2007 UTC (12 years, 4 months ago) by dpvc
Copy the error message translation array when a Context is duplicated.

Revision 5252 - Directory Listing
Modified Thu Aug 9 06:01:48 2007 UTC (12 years, 4 months ago) by dpvc
Make sure ^ is quoted in character patterns so it doesn't become a
negatted character pattern.

Revision 5251 - Directory Listing
Modified Thu Aug 9 03:22:43 2007 UTC (12 years, 4 months ago) by dpvc
Added withPostFilter and withPreFilter methods to the AnswerHash.
These install the filter but return the AnswerHash rather than the
filter lists so that you can do things like

       ANS(Real(10)->cmp->withPostFilter(...));

rather than having to save the answer checker, add the filter, then
call ANS with it.

Also adjusted some spacing.

Revision 5246 - Directory Listing
Modified Wed Aug 8 07:16:46 2007 UTC (12 years, 4 months ago) by dpvc
Don't convert lists to inervals unless they have the correct types of parens.

Revision 5241 - Directory Listing
Modified Tue Aug 7 04:35:32 2007 UTC (12 years, 4 months ago) by dpvc
Make perlFunction() maintain the context properly when the function is
evaluated.  (Still need to make it set the {equation} field?)

Also set the {equation} field for values returned by eval().

Revision 5240 - Directory Listing
Modified Tue Aug 7 04:33:31 2007 UTC (12 years, 4 months ago) by dpvc
Use cached value of context rather than looking it up each time.

Revision 5239 - Directory Listing
Modified Tue Aug 7 04:32:33 2007 UTC (12 years, 4 months ago) by dpvc
Use corret indices for the left and right endpoints.  (The paren types
are not stared in the data, only the endpoints, so use entries 0
and 1, not 1 and 2).

Revision 5238 - Directory Listing
Modified Tue Aug 7 04:30:59 2007 UTC (12 years, 4 months ago) by dpvc
Use getCopy() rather than depricated get() method.

Revision 5237 - Directory Listing
Modified Tue Aug 7 04:30:27 2007 UTC (12 years, 4 months ago) by dpvc
Allow Context()->variables-add(name=>[type,options]) format for
declaring a variable.

Revision 5236 - Directory Listing
Modified Tue Aug 7 04:27:35 2007 UTC (12 years, 4 months ago) by dpvc
Fixed an error in the documentation.

Revision 5214 - Directory Listing
Modified Mon Jul 23 12:11:14 2007 UTC (12 years, 4 months ago) by dpvc
Allow Parser::Formula to accept context parameter.

Revision 5181 - Directory Listing
Modified Sun Jul 15 13:03:43 2007 UTC (12 years, 5 months ago) by dpvc
Removed promote() from calls to funcitons where the operand will
already be a Complex; overloaded operations guarantee this, unless the
funciton is called explicitly through the package name.  It is
more direct to do something like sin(Complex($a,$b)) than
Value::Complex::sin($a,$b) anyway.  Although I was trying to allow
both forms, it is not worth the overhead to allow the second form, and
it is nor really "best practice" anyway.

Revision 5180 - Directory Listing
Modified Sun Jul 15 12:11:07 2007 UTC (12 years, 5 months ago) by dpvc
Accidental typo due to global search and replace.

Revision 5178 - Directory Listing
Modified Fri Jul 13 21:59:34 2007 UTC (12 years, 5 months ago) by dpvc
Make periodic comparisons have their tolerances based on the correct
answer point rather than just the period.  (This avoids zeroLevel
checks on one coordiante when period is pure imaginary or pure real.)

Also fixed promote() calls since it has been moved to Value.pm.

Revision 5170 - Directory Listing
Modified Fri Jul 13 20:50:45 2007 UTC (12 years, 5 months ago) by dpvc
Make Real and Complex objects promote their period fields so that they
can be specified as strings rather than actual objects.

Also make the default promote() routine be the more sophisticated one
used by Real and Complex (and so remove the reoutine from those objects).

Revision 5132 - Directory Listing
Modified Mon Jul 9 19:54:21 2007 UTC (12 years, 5 months ago) by dpvc
Better control over when extra parentheses are added.

Revision 5131 - Directory Listing
Modified Mon Jul 9 19:53:15 2007 UTC (12 years, 5 months ago) by dpvc
Remove the space inserted by \left...\right when it appears in a
multiplication operation (so function calls look better, for example).

Revision 5130 - Directory Listing
Modified Mon Jul 9 12:45:06 2007 UTC (12 years, 5 months ago) by dpvc
Added new flags to error checking of operands and function arguments.
This is so that a context can be developed that is more forgiving
about what can be put next to what.  Such a context can NOT be used
for evaluation or answer checking, but can be used to generate TeX
output in more sophisticated situations.

Revision 5128 - Directory Listing
Modified Fri Jul 6 15:22:29 2007 UTC (12 years, 5 months ago) by dpvc
Have getFlag look in the equation's equation for the flag as well (so
that formulas that are split into separate formulas will have their
points be able to find flags from the original list-values formula.

Revision 5127 - Directory Listing
Modified Fri Jul 6 15:21:12 2007 UTC (12 years, 5 months ago) by dpvc
Record the equation of the separate components of the list so that
getFlag will be able to obtain the values from the original list or
formula.

Revision 5126 - Directory Listing
Modified Fri Jul 6 15:19:37 2007 UTC (12 years, 5 months ago) by dpvc
The value computed by modulo() is already a Complex, so no need to
cast it to be one (in fact, it screwed up the value, since make()
expects the real and imagniary parts separately).

Revision 5125 - Directory Listing
Modified Wed Jul 4 20:26:24 2007 UTC (12 years, 5 months ago) by dpvc
Use precompiled patterns for efficiency.

Revision 5124 - Directory Listing
Modified Wed Jul 4 20:13:03 2007 UTC (12 years, 5 months ago) by dpvc
Make the patterns be pre-compiled patterns for efficiency.

Revision 5123 - Directory Listing
Modified Wed Jul 4 20:11:17 2007 UTC (12 years, 5 months ago) by dpvc
Make sure the caiseInsensitive array is copied when the context is
copied (so that the token list will be maintained correctly).

Revision 5122 - Directory Listing
Modified Wed Jul 4 17:04:51 2007 UTC (12 years, 5 months ago) by dpvc
Allow constants to be defined by a hash (like everything else) if desired.

Revision 5121 - Directory Listing
Modified Wed Jul 4 17:02:26 2007 UTC (12 years, 5 months ago) by dpvc
Cosmetic change.

Revision 5120 - Directory Listing
Modified Wed Jul 4 17:00:18 2007 UTC (12 years, 5 months ago) by dpvc
Allow constants to override their string representations.

Revision 5119 - Directory Listing
Modified Wed Jul 4 01:19:18 2007 UTC (12 years, 5 months ago) by dpvc
Removed some unneeded spaces in the comments.

Revision 5118 - Directory Listing
Modified Wed Jul 4 01:18:52 2007 UTC (12 years, 5 months ago) by dpvc
Make string() method use the separator specified in the List
definition rather than a hard coded comma.

Revision 5117 - Directory Listing
Modified Wed Jul 4 01:17:56 2007 UTC (12 years, 5 months ago) by dpvc
Use a precedence lower than the lowest allowed precedence when closing
the formula as a whole (to force ALL the operators to be performed).

Revision 5116 - Directory Listing
Modified Tue Jul 3 10:44:30 2007 UTC (12 years, 5 months ago) by dpvc
Modified the method used to tokenize a formula to use one large
pattern that includes all the token types rather than individual
patterns for variables, strings, operators, and so on.  This allows
the Parser to handle the situation where a token of one type is a
prefix of a token of another type (e.g., < as a parenthesis but <- as
an operator) without worrying about which one is checked first.  The
new mtheod is also more flexible about having additional patterns
(like quoted strings, or arbitrary variable names) and about
specifying the order in which they are applied.

Revision 5115 - Directory Listing
Modified Mon Jul 2 23:48:00 2007 UTC (12 years, 5 months ago) by dpvc
Get the period and logperiodic values using getFlags rather than only
looking in the object itself (this allows it to inherit the values
from a Formula, for example).

Revision 5114 - Directory Listing
Modified Mon Jul 2 23:21:06 2007 UTC (12 years, 5 months ago) by dpvc
Fixed error in derivative of quotients introduced by recent bad editing.

Revision 5113 - Directory Listing
Modified Mon Jul 2 16:27:13 2007 UTC (12 years, 5 months ago) by dpvc
Improve some error messages.
In comparisons, mark the values created by the formulas so that they
will use the formula's tolerances.

Revision 5112 - Directory Listing
Modified Mon Jul 2 16:18:49 2007 UTC (12 years, 5 months ago) by dpvc
Make getFlag() look for an {equation} field and add that into the
search path for the flag.  This lets Formula object tag their results
so that printing and comparisons will use the flags from the Formula
for formats and tolerances.

Revision 5111 - Directory Listing
Modified Mon Jul 2 00:50:14 2007 UTC (12 years, 5 months ago) by dpvc
Changed with() to make a copy (as suggested last week).  This one is a
deep copy, however, since the tree is modified and we don't want to
change the original, we need to make a deep copy.

Adjust bop() to remove dependency on hard-coded Parser package name.

Remove stringify, which is now identical to parent version

Move usesOneOf to near isConstant (cosmetic change only).

Revision 5108 - Directory Listing
Modified Sun Jul 1 18:34:13 2007 UTC (12 years, 5 months ago) by dpvc
Remove unneeded parens and do better type coersion in new() method.
Preserve contexts in more situations.
Handle errors in powers better.
Promote more types of objects (specifically, parse string values) in several places.
Handle dimensions more carefully in comparison.
Handle dimensions more carefully in column extraction.
Allow identity matrix dimension to come from the object creating it, when applicable.
Don't override stringify or string methods.  (This used to be needed
  to force the display to use proper open and close symbols, but
  we now coerce the rows to be of matrix type, so that is no longer needed.)

Revision 5107 - Directory Listing
Modified Sun Jul 1 18:25:24 2007 UTC (12 years, 5 months ago) by dpvc
Arrange for creation of constant Matrices to produce 1 x n matrices
(rather than vectors) properly.  (This involves including an extra
array reference in List.pm, which must be removed in list types that
don't need them, namely intervals and absolute value.)

Revision 5106 - Directory Listing
Modified Sun Jul 1 18:22:48 2007 UTC (12 years, 5 months ago) by dpvc
Make extract() handle out-of-bound indices better.

Revision 5105 - Directory Listing
Modified Sun Jul 1 11:18:39 2007 UTC (12 years, 5 months ago) by dpvc
Do a better version of promote (get the context right) for these
function calls.

Revision 5104 - Directory Listing
Modified Sun Jul 1 11:17:31 2007 UTC (12 years, 5 months ago) by dpvc
Remove unneeded parens, and don't use $isMatrix (scalar(@d) being
non-zero can be used instead).
Make sure ColumnVector status is retained in make() (so that adding
column vectors produces a column vector, for example).
Convert more values in promote (e.g., strings).
Fix a number of error messages and comments, and some formatting.
Handle contexts better.
Arrange for method inheritence in abs and areParallel.
Don't need stringify since it is now the same as the parent version.

Revision 5103 - Directory Listing
Modified Sun Jul 1 11:11:01 2007 UTC (12 years, 5 months ago) by dpvc
Promote more possible values (e.g., strings).

Revision 5102 - Directory Listing
Modified Sun Jul 1 11:10:08 2007 UTC (12 years, 5 months ago) by dpvc
Break out of makeValue earlier if the object is already a Value object.

Revision 5101 - Directory Listing
Modified Sun Jul 1 01:50:21 2007 UTC (12 years, 5 months ago) by dpvc
Remove unneeded paretheses.
Don't need $isMatrix (since scalar(@d) non-zero tells us that).
Fix up some error messages.

Revision 5100 - Directory Listing
Modified Sat Jun 30 15:07:45 2007 UTC (12 years, 5 months ago) by dpvc
Maintain context in a number of places where it was being lost.
Properly create Intervals from List and Point objects, when apropriate.
Properly create Formulas from non-constant Unions.
Properly report whether Unions of single items are reduced.
Only add parentheses when needed in stringify.

Revision 5099 - Directory Listing
Modified Sat Jun 30 15:02:17 2007 UTC (12 years, 5 months ago) by dpvc
Make sure classMatch always has a Context object, and don't report
Package errors in this routine.

Revision 5097 - Directory Listing
Modified Sat Jun 30 02:39:10 2007 UTC (12 years, 5 months ago) by dpvc
Promote arguments to Union operations.
Fix a typo.
Remove stringify since it is now the same as the parent class.

Revision 5096 - Directory Listing
Modified Sat Jun 30 02:37:34 2007 UTC (12 years, 5 months ago) by dpvc
Remove unneeded parens in if statements.
Don't need $isMatrix (since scalar(@d) > 0 only in that case).
Promote arguements to Set operations.
Use Union routine to handle subtraction, since promotion may return an
interval or union under some circumstances.

Revision 5095 - Directory Listing
Modified Sat Jun 30 02:33:11 2007 UTC (12 years, 5 months ago) by dpvc
Need to use flag() not getFlag() for context objects.

Revision 5094 - Directory Listing
Modified Sat Jun 30 02:32:34 2007 UTC (12 years, 5 months ago) by dpvc
Don't need those parens.

Revision 5093 - Directory Listing
Modified Sat Jun 30 00:35:17 2007 UTC (12 years, 5 months ago) by dpvc
Produce a set when the endpoints of the interval are the same.
Fixed an error with the length method.
Make transferFlags only operate on the endpoints, no the parens.
Allow subtraction between intervals and non-intervals.
Promote non-intervals in the set operations.

Revision 5092 - Directory Listing
Modified Sat Jun 30 00:29:52 2007 UTC (12 years, 5 months ago) by dpvc
Vectors can't be in Unions, even when of length two and with no parens.

Revision 5091 - Directory Listing
Modified Sat Jun 30 00:28:32 2007 UTC (12 years, 5 months ago) by dpvc
Handle canBeInUnion properly (it must come AFTER isSetOfReals, and
needs to deal with empty parens).

Revision 5090 - Directory Listing
Modified Sat Jun 30 00:26:42 2007 UTC (12 years, 5 months ago) by dpvc
Allow empty open and close parens for canBeInUnion method.
Reverse order of loops in transferFlags so that we can skip the
transfer if there is no flag in the object (true most of the time).

Revision 5089 - Directory Listing
Modified Fri Jun 29 22:07:10 2007 UTC (12 years, 5 months ago) by dpvc
Transfer flags from parent objects to their children for comparisons
and printing purposes.  Also touch up a few type-coersion issues.  (It
may be possible to not to need Value::isValue() if these can all be
taken care of.)

Revision 5088 - Directory Listing
Modified Fri Jun 29 20:05:15 2007 UTC (12 years, 5 months ago) by dpvc
Improved an error message, fixed comparison of infinity to real
numbers, and aded a missing space in TeX output.

Revision 5085 - Directory Listing
Modified Fri Jun 29 19:13:37 2007 UTC (12 years, 5 months ago) by dpvc
Fixed some type checking.  Removed some unwantedd fuzzy checks (use
exact checks instead).  Preserve context flags from complex object to
real and imaginary parts.  Preserve context during function evaluations.

Revision 5084 - Directory Listing
Modified Fri Jun 29 19:11:05 2007 UTC (12 years, 5 months ago) by dpvc
Adjusted some of the type checking to use more appropriate tests.

Revision 5083 - Directory Listing
Modified Fri Jun 29 19:08:53 2007 UTC (12 years, 5 months ago) by dpvc
Combine isReal and isComplex into a single classMatch call.

Revision 5082 - Directory Listing
Modified Fri Jun 29 19:08:04 2007 UTC (12 years, 5 months ago) by dpvc
Only promote complex numbers of they aren't already complex (this
prevents changing the context, since Parser::Function->call is called
directly, so $self->context is the current context, not the context of
the argument being passed).

Revision 5072 - Directory Listing
Modified Thu Jun 28 23:40:46 2007 UTC (12 years, 5 months ago) by dpvc
Fixed a typo in the compare method.

Revision 5068 - Directory Listing
Modified Thu Jun 28 22:45:57 2007 UTC (12 years, 5 months ago) by dpvc
Look for the StringifyAsTeX flag in the current context only (not the
original context of the object).  This will make Context()->texStrings
work properly even when some objects are created in other contexts.

Revision 5067 - Directory Listing
Modified Thu Jun 28 22:33:31 2007 UTC (12 years, 5 months ago) by dpvc
Added perl method so that the result is always a number (not a blank
when it is false).

Revision 5060 - Directory Listing
Modified Thu Jun 28 20:42:53 2007 UTC (12 years, 5 months ago) by dpvc
Use Value->context rather than $$Value::context.

Revision 5056 - Directory Listing
Modified Thu Jun 28 11:32:10 2007 UTC (12 years, 5 months ago) by dpvc
Make List() preserve the correct_ans field when it is used to coerce a
single element to a singleton list.

Revision 5042 - Directory Listing
Modified Thu Jun 28 01:31:09 2007 UTC (12 years, 5 months ago) by dpvc
Recent changes to automatically do promotion in the Value methods was
a mistake.  I put it back into the subclass methods again.

Revision 5041 - Directory Listing
Modified Wed Jun 27 23:30:54 2007 UTC (12 years, 5 months ago) by dpvc
Fixed incorrect use of numeric rather than string comparison.

Revision 5040 - Directory Listing
Modified Wed Jun 27 22:45:39 2007 UTC (12 years, 5 months ago) by dpvc
Don't create a new copy of an object if it is already of the correct
class in promote().

Revision 5039 - Directory Listing
Modified Wed Jun 27 20:22:20 2007 UTC (12 years, 5 months ago) by dpvc
OOPS, the example in the previous message is wrong.  You need to use

      $a = Context()->variables->get("a")->{value};
      $b = Context()->variables->get("b")->{value};

(brtaces around the "value").

Revision 5038 - Directory Listing
Modified Wed Jun 27 20:20:12 2007 UTC (12 years, 5 months ago) by dpvc
Adaptive-parameter values are now stored in the Context so that they
can be retreived if needed.  E.g.,

    Formula("a x + b") == Formula("5 x - 3");
    $a = Context()->variables->get("a")->value;
    $b = Context()->variables->get("b")->value;

will have $a equal to 5 and $b equal to -3.

Revision 5037 - Directory Listing
Modified Wed Jun 27 19:50:45 2007 UTC (12 years, 5 months ago) by dpvc
Changed the with() method to produce a (shallow) copy rather than
modify the original object.  So now $x->with(foo=>'bar') will make a
copy of $x with a field "foo" set to "bar" rather than set "foo" to
"bar" in $x itself.

(This is in response to discussion from our June 26th meeting at UofR.)

Revision 5027 - Directory Listing
Modified Sat Jun 23 20:20:09 2007 UTC (12 years, 5 months ago) by dpvc
Forgot to handle context in the make() method.

Revision 5026 - Directory Listing
Modified Sat Jun 23 20:08:07 2007 UTC (12 years, 5 months ago) by dpvc
Make the Package method really be a method of the context rather than
the Value objects, and make the Value method call the context one.
This means it is not necessary to pass the context as a parameter any
longer.

Revision 5025 - Directory Listing
Modified Sat Jun 23 20:05:49 2007 UTC (12 years, 5 months ago) by dpvc
Was taking the context form the wrong position in the parameter list.

Revision 5024 - Directory Listing
Modified Sat Jun 23 19:46:00 2007 UTC (12 years, 5 months ago) by dpvc
Fix typo, and handle case where Allow is called from package.

Revision 5023 - Directory Listing
Modified Sat Jun 23 19:45:17 2007 UTC (12 years, 5 months ago) by dpvc
Make context method work when called from package rather than blessed object.

Revision 5016 - Directory Listing
Modified Fri Jun 22 02:39:24 2007 UTC (12 years, 5 months ago) by dpvc
Handle ans_array() correctly again (context issues, and allow parser
to create a formula from an existing subtree).

Revision 5015 - Directory Listing
Modified Fri Jun 22 01:56:06 2007 UTC (12 years, 5 months ago) by dpvc
more fixes to handle the contexts properly.

Revision 5014 - Directory Listing
Modified Fri Jun 22 00:26:47 2007 UTC (12 years, 5 months ago) by dpvc
Fixed context issues and a typo (must have been interrupted when
editing this file earlier).  Also modified the units pattern to allow
trailing spaces.

Revision 5013 - Directory Listing
Modified Thu Jun 21 23:29:10 2007 UTC (12 years, 5 months ago) by dpvc
Don't use \cdot with things like 3i.

Revision 5012 - Directory Listing
Modified Thu Jun 21 23:10:13 2007 UTC (12 years, 5 months ago) by dpvc
Added Package method to the Context object to replace the
Value->Package() calls and simplify the $self->Package calls (don't
have to look up the context again).

Revision 5006 - Directory Listing
Modified Sat Jun 16 02:08:02 2007 UTC (12 years, 5 months ago) by dpvc
Fixed an error with the modulo method, and adjusted formatting.

Revision 5005 - Directory Listing
Modified Sat Jun 16 02:07:07 2007 UTC (12 years, 5 months ago) by dpvc
Fixed a problem with modulo method.

Revision 5004 - Directory Listing
Modified Fri Jun 15 03:17:31 2007 UTC (12 years, 6 months ago) by dpvc
Only set the context if the data is a MathObject.

Revision 5001 - Directory Listing
Modified Tue Jun 12 04:05:56 2007 UTC (12 years, 6 months ago) by dpvc
More fixes for creating items in the corret context.  Also added a
method for looking up the package associated with a particular Parser
class (for consistency with the Value->Package call).

Revision 4996 - Directory Listing
Modified Sun Jun 10 11:34:27 2007 UTC (12 years, 6 months ago) by dpvc
Allow promote() to accept a context as the first argument so that the
promoted object can be forced into the given context.

Revision 4995 - Directory Listing
Modified Sun Jun 10 01:19:29 2007 UTC (12 years, 6 months ago) by dpvc
Use numeric rather than string comparison to see if contexts are
equal.

Revision 4994 - Directory Listing
Modified Sun Jun 10 01:17:29 2007 UTC (12 years, 6 months ago) by dpvc
Update to handle the fact that the Value package now includes the
context with all MathObjects.  (This may still need some work.)

Revision 4993 - Directory Listing
Modified Fri Jun 8 12:09:53 2007 UTC (12 years, 6 months ago) by dpvc
Added more flexible type checking for MathObject classes.  This makes
it possible to correctly match types even when the context has
specified a different package to handle a given type, for example.

Revision 4992 - Directory Listing
Modified Fri Jun 8 11:05:48 2007 UTC (12 years, 6 months ago) by dpvc
Fixed typo.

Revision 4991 - Directory Listing
Modified Fri Jun 8 02:09:21 2007 UTC (12 years, 6 months ago) by dpvc
Update new() and make() methods to accept a context as the first
parameter (making it easier to create objects in a given context
without having to resort to a separate call to coerce them to the
given context after the fact).

Revision 4990 - Directory Listing
Modified Thu Jun 7 23:48:20 2007 UTC (12 years, 6 months ago) by dpvc
More updates to use the new Value->Package() call.  This will make the
standard object-creation functions like Real() and Complex() use the
new lookup method.

Revision 4989 - Directory Listing
Modified Thu Jun 7 23:47:14 2007 UTC (12 years, 6 months ago) by dpvc
can't use inContext() with the "fake" make that produces perl reals,
so remove it for now.  (Perhaps we should just go with the Reals() and
not try to be fancy about it, since it will often get converted to a
Real anyway).  This will need more work.

Revision 4988 - Directory Listing
Modified Thu Jun 7 23:43:42 2007 UTC (12 years, 6 months ago) by dpvc
Give the MathObjects answer checker a _filter_name so it is easier to recognize.

Revision 4987 - Directory Listing
Modified Thu Jun 7 21:54:46 2007 UTC (12 years, 6 months ago) by dpvc
Added Value->Package(name[,context]) to look up what package is
currently set to handle the named type.  E.g.,
Value->Package("Complex") usually returns "Value::Complex".  These can
be overridden in the Context so that modified vesions of the
MathObjects can be made to replace the existing ones more easily.  In
particular, the Parser classes should call these (not yet implemented)
when they create objects, so that you can override the object they
create.

Also cleaned up some more context issues (with still more to come).

Revision 4981 - Directory Listing
Modified Thu Jun 7 12:35:02 2007 UTC (12 years, 6 months ago) by dpvc
Context() now always makes a copy of the context, even if it comes
from the problem's local contxt table.  That way it will work
consistently no matter where the context comes from.  (In the past, if
PGcourse.pl made a local copy of a context that it could modify, for
example, then Context() would not copy it when it was called, and that
means problems that relied on Context(name) resetting the context to
its original values would not work properly.

Revision 4980 - Directory Listing
Modified Thu Jun 7 12:30:28 2007 UTC (12 years, 6 months ago) by dpvc
Updated to include some recent changes in documentation and removal of
old commented-out code.

Revision 4979 - Directory Listing
Modified Thu Jun 7 11:59:05 2007 UTC (12 years, 6 months ago) by dpvc
More updates for marking MathObjects with the context in which they
were created, so they should now work like the Formula objects in that
respect.  As they are combined via overloaded operators, they should
pass on their contexts correctly.

Also normalized the use of getFlag() to obtain flags from the
MathObject's context rather than looking in the context directly.
This allows the math object to override the flag by setting the flag
value in the object's hash (e.g., $f->{tolerance} = .001).  I've also
added the ability to override context flags via the answerHash (e.g.,
$f->cmp(tolerance => .001)), though some filtering may need to be
added to this at some point.  Note that ONLY the context flags can be
overridden, not other parts of the context.

Revision 4976 - Directory Listing
Modified Wed Jun 6 23:00:14 2007 UTC (12 years, 6 months ago) by dpvc
Added comparisons for periodic reals and complex numbers (numbers that
match up to reduction module some number).  This makes
contextPeriodic.pl obsolete, but the problems that use it should not
need to change.  (It would be good to remove the loadMacros() call,
however.)

Reals and Complex numbers now overload the % operator for the modulo
operation.

Revision 4975 - Directory Listing
Modified Wed Jun 6 21:44:05 2007 UTC (12 years, 6 months ago) by dpvc
This begins some major updates to the Parser and Value libraries.
This may make the MathObjects unstable as things shake down, but I'll
try to keep that to a minimum.

This update reorganizes how the overloading of operations are
implemented.  The base Value class is now overloaded rather than the
individual Value classes.  This makes it easier to make subclasses
that take advantage of the overloading.

The code that handles promoting one MathObject to another has been
updated as a part of this.  This should also make subclassing the
existing MathObjects more flexible.

In the past, Formula objects included a pointer to the Context in
which the object was created, but other MathObject did not.  This
update is the first round of updates to include the context in the
other MathObjects, but more work needs to be done.

The changes here should not affect existing problems; it is possible
that some macro files will need to be updated, but none of the
standard ones in pg/macros seem to need it at the moment.

Revision 4969 - Directory Listing
Modified Thu May 24 17:55:37 2007 UTC (12 years, 6 months ago) by gage
Pod documentation upgrades

Revision 4964 - Directory Listing
Modified Tue May 22 18:02:40 2007 UTC (12 years, 6 months ago) by dpvc
Fixed an error with List answer checking when one of the elements was
the constant 0 (a check for whether a value was defined was not
properly handling the case when the answer is zero (which counts as
false in a boolean check)).

Revision 4962 - Directory Listing
Modified Wed May 16 00:36:37 2007 UTC (12 years, 6 months ago) by dpvc
Allow Real object to override the context's number format by setting
its format field.  E.g.:

    Real(1.2345)->with(format=>"%.2f")

Revision 4930 - Directory Listing
Modified Wed Apr 18 22:37:59 2007 UTC (12 years, 7 months ago) by dpvc
Clear the error message in Context before it is used in an answer
checker (prevents bleading of one error into a later answer).

Revision 4928 - Directory Listing
Modified Tue Apr 17 00:36:16 2007 UTC (12 years, 7 months ago) by dpvc
Modified the way the Parser-based versions of the traditional answer
checkers get copies of their contexts.  They now use a new method
getCopy to obtain the copy either from the problem's context table or
the default table (rather than only from the default).  That way the
instructor can use parserCustomization.pl to customize the contexts
used by the answer checkers.

Revision 4927 - Directory Listing
Modified Tue Apr 17 00:31:13 2007 UTC (12 years, 7 months ago) by dpvc
Added a Vector2D context that has i and j defined as vectors in
2-space so that they can be used to generate vectors in 2D.  This
avoids students getting the "incorrect number of coordinates" error.

Revision 4844 - Directory Listing
Modified Tue Mar 6 01:51:12 2007 UTC (12 years, 9 months ago) by gage
Format fix

Revision 4834 - Directory Listing
Modified Sun Mar 4 23:39:20 2007 UTC (12 years, 9 months ago) by gage
Formatting changes in documentation

Revision 4833 - Directory Listing
Modified Sun Mar 4 23:26:12 2007 UTC (12 years, 9 months ago) by gage
More format changes to documentation

Revision 4829 - Directory Listing
Modified Sun Mar 4 22:10:40 2007 UTC (12 years, 9 months ago) by gage
 Updated documentation in response to comments from Davide.
 More comments welcome. :-)

 --Mike

Revision 4827 - Directory Listing
Modified Sun Mar 4 20:58:26 2007 UTC (12 years, 9 months ago) by gage
Added pod documentation for these files

Revision 4826 - Directory Listing
Modified Sun Mar 4 20:57:00 2007 UTC (12 years, 9 months ago) by gage
Correct pretty_print so that it protects for HTML output
(replaces < by &lt;)

Revision 4824 - Directory Listing
Modified Sat Mar 3 00:31:14 2007 UTC (12 years, 9 months ago) by dpvc
Only show the adaptive parameters where there actually ARE some, and
fix a typo when looking up the adaptive points when there aren't any.

Revision 4823 - Directory Listing
Modified Sat Mar 3 00:17:12 2007 UTC (12 years, 9 months ago) by dpvc
Improved Formula diagonstics when adaptive parameters are used.  They
now allow you to graph the functions (they are no longer considered
multi-variable functions), and the values reported are the adapted
values rather then the unadapted correct answers.  This now correctly
reflects the tests that are being performed.

Revision 4822 - Directory Listing
Modified Sat Mar 3 00:11:28 2007 UTC (12 years, 9 months ago) by dpvc
Use zeroLevelTol values when checking answers that have adaptive parameters.

Revision 4795 - Directory Listing
Modified Sun Feb 25 20:59:09 2007 UTC (12 years, 9 months ago) by dpvc
Avoid an infinite loop when string-values formulas are used in a List.
Allow diagonstics to work for complex-valued functions.

Revision 4766 - Directory Listing
Modified Sat Feb 3 15:25:18 2007 UTC (12 years, 10 months ago) by gage
Added new permissable log files.
that can be written to.

Revision 4765 - Directory Listing
Modified Sat Feb 3 15:23:05 2007 UTC (12 years, 10 months ago) by gage
Begin pod documentation.

Revision 4764 - Directory Listing
Modified Sat Feb 3 15:20:25 2007 UTC (12 years, 10 months ago) by gage
added a "level" to pretty_print to prevent it from descending too far down
nested hashes.  The default level is set at 3 which is probably enough for
most purposes.

Revision 4760 - Directory Listing
Modified Wed Jan 31 16:16:44 2007 UTC (12 years, 10 months ago) by gage
Added space when combining preview latex strings    (foo  + bar   became   foo\quadbar  which didn't work
now its foo \quad bar which is better.

Revision 4729 - Directory Listing
Modified Sat Dec 16 14:10:12 2006 UTC (12 years, 11 months ago) by dpvc
Add a new operator // to be the same as / except its TeX form is a/b
rather than \frac{a}{b}.  This makes it possible get horizontal
fractions in exponents, for example, where vertical fractions often
don't look so good.

Revision 4728 - Directory Listing
Modified Sat Dec 16 14:07:58 2006 UTC (12 years, 11 months ago) by dpvc
Use Perl reals rather than Parser Reals in matrix for adaptive
parameters.

Revision 4680 - Directory Listing
Modified Tue Nov 28 19:12:12 2006 UTC (13 years ago) by sh002i
SECURITY: tighter constraints on which macro files can be loaded without
restriction. Previously, any file that *contained* the strings PG.pl,
dangerousMacros.pl, or IO.pl would be loaded with an empty opmask.

This is the second attempt to close this hole. The previous attempt
assumed that | binds tighter than ^ and $, which is not true. (Noticed
by dpvc). It also failed to escape metacharacters in the file names.

Revision 4678 - Directory Listing
Modified Mon Nov 27 18:57:41 2006 UTC (13 years ago) by sh002i
formatting, ordering

Revision 4672 - Directory Listing
Modified Mon Nov 27 04:20:40 2006 UTC (13 years ago) by dpvc
Abstracted the NumberWithUnits to a more general ObjectWithUnits and
moved the FormulaWithUnits to this file as well, since most of the
code is common.  Although, strictly speaking, FormulaWithUnits is not
legacy code, since the general object-with-units is here, it will be
easier to maintain FormulaWithUnits here as well.  When the Parser
gets a real units class, all of this can be removed.

Also fixed the unit lookup code to use the actual names from the Units
library, so we can now be more accurate about determining the extent
of the units, and can handle things like '5 kg m / s' now.  In the
case of ambiguous formulas with units, e.g., '5m kg' where m is a
variable, use '5*m kg' or '(5m) kg'.

Revision 4671 - Directory Listing
Modified Mon Nov 27 02:01:24 2006 UTC (13 years ago) by gage
Make
Units::fundamental_units  and

Units::known_units  public hashes.

Revision 4669 - Directory Listing
Modified Mon Nov 27 00:00:46 2006 UTC (13 years ago) by dpvc
The Units.pm library only accepts one division within the units, and
the Parser wasn't taking that into account, so students could enter
m/s/s and still get credit even if the units were m/s.  This have been
fixed.

Revision 4667 - Directory Listing
Modified Sun Nov 26 21:58:43 2006 UTC (13 years ago) by dpvc
Fixed a problem where the TeX version included two copies of the units
(one in TeX mode and one from the string() output).

Revision 4663 - Directory Listing
Modified Sun Nov 26 20:30:17 2006 UTC (13 years ago) by dpvc
Added ability to have additional information given when not enough
test points can be generated for a function comparison.  By default,
this information is NOT shown (since it could give students additional
information about what answer is expectd).  Professors can request it
by setting the 'showTestPointErrors' flag in the Context().

Revision 4662 - Directory Listing
Modified Sun Nov 26 20:11:03 2006 UTC (13 years ago) by dpvc
Allow overridden Parser classes to generate error messages that the
student will see.  (For formulas, error messages are trapped silently
by the overridden == and will not be seen.  This lets Parser objects
force a message to be seen.)

Revision 4654 - Directory Listing
Modified Wed Nov 15 16:50:05 2006 UTC (13 years ago) by sh002i
SECURITY: tighter constraints on which macro files can be loaded without
restriction. Previously, any file that *contained* the strings PG.pl,
dangerousMacros.pl, or IO.pl would be loaded with an empty opmask.

Revision 4625 - Directory Listing
Modified Fri Nov 3 23:05:37 2006 UTC (13 years, 1 month ago) by dpvc
Fixed problem with checking Matrices of dimension 1 x n.
(Fixes bug 1122.)

Revision 4583 - Directory Listing
Modified Mon Oct 23 11:43:40 2006 UTC (13 years, 1 month ago) by dpvc
Make sure \cdot is only used for a numeric right-hand part (finishes
fix of bug 1114).

Revision 4582 - Directory Listing
Modified Mon Oct 23 11:38:14 2006 UTC (13 years, 1 month ago) by dpvc
Use \cdot when a number is followed by a numeric fraction.
(Fixes bug 1114.)

Revision 4546 - Directory Listing
Modified Thu Oct 5 11:10:06 2006 UTC (13 years, 2 months ago) by dpvc
Fixed bad check for if the complex number is 1 (caused reduce to
incorrectly remove the complex number when used in multiplication).

Revision 4528 - Directory Listing
Modified Wed Sep 27 17:15:18 2006 UTC (13 years, 2 months ago) by dpvc
Fixed problem where a zero with units would me marked as "not looking
like anumber with units".

Revision 4513 - Directory Listing
Modified Fri Sep 22 16:36:57 2006 UTC (13 years, 2 months ago) by dpvc
Make ijk mode use the TeX definitions from the i, j and k constants as
defined in the context, if they exist, otherwise fall back on the
defaults.

Revision 4512 - Directory Listing
Modified Thu Sep 21 22:08:49 2006 UTC (13 years, 2 months ago) by dpvc
Fix problem with formula comparisons involving vector-valued formulas.
The coordinates for the vectors used in checking equality were plain
Perl reals rather than Parser-based reals, and so the comparisons were
being done using exact rather than fuzzy comparisons.

Revision 4511 - Directory Listing
Modified Wed Sep 20 23:38:38 2006 UTC (13 years, 2 months ago) by dpvc
Make a more sophisticated unit check so that it will handle things
like "3ft / s" (that don't have a space before the units).

Really need to make a units class for the Parser.

Revision 4510 - Directory Listing
Modified Wed Sep 20 21:50:56 2006 UTC (13 years, 2 months ago) by dpvc
Fixed unit checking so that units can include spaces (like 4 ft /
min).  Also fixed a problem where units were not being reported as
part of the student's entered answer.

Revision 4488 - Directory Listing
Modified Mon Sep 11 22:23:45 2006 UTC (13 years, 3 months ago) by dpvc
Allow matrices to set their own templates (instead of using "c" for
all columns), and handle missing open and close delimiters better.

Revision 4487 - Directory Listing
Modified Mon Sep 11 22:21:49 2006 UTC (13 years, 3 months ago) by dpvc
Allow the _check subroutine to affect the {isConstant} field.

Revision 4464 - Directory Listing
Modified Sat Sep 9 00:22:13 2006 UTC (13 years, 3 months ago) by dpvc
Add parenthesis around ijk vectors for string concatenation.

Revision 4454 - Directory Listing
Modified Thu Sep 7 01:18:08 2006 UTC (13 years, 3 months ago) by dpvc
Added ability to overrid TeX and perl versions by specifying a TeX or
perl field in the variable definition.  Also made vector-valued
variables show up in bold.

Revision 4423 - Directory Listing
Modified Tue Aug 29 11:12:56 2006 UTC (13 years, 3 months ago) by dpvc
Allow cmp_compare to return an array of answers, if requested (needed
by parserMultiPart.pl).

Revision 4388 - Directory Listing
Modified Sat Aug 19 23:31:38 2006 UTC (13 years, 3 months ago) by dpvc
Fixed the problem I pointed out at MathFest where some errors were not
being reported in the traditional num_cmp() function.  (Things like
'x+3' in a numeric field would not be reported as an error and x would
be treated as 0).  This is due to a change in version 1.14 when Sam
was normalizing the error reporting code; he didn't notice that warn
had been rerouted to die in PG_answer_eval().  I have replaced it.

Revision 4384 - Directory Listing
Modified Wed Aug 16 01:41:02 2006 UTC (13 years, 3 months ago) by dpvc
Fixed spelling errors in error messages.

Revision 4383 - Directory Listing
Modified Wed Aug 16 01:40:06 2006 UTC (13 years, 3 months ago) by dpvc
Fixed a problem where Set objects could incorrectly complain about the
parentheses (braces) used to declare the set.

Revision 4382 - Directory Listing
Modified Wed Aug 16 01:37:28 2006 UTC (13 years, 3 months ago) by dpvc
Fixed a bug where substituting values into a Formula object would not
be cleaned up properly (so later actions could incorrectly include the
same substitution).

Revision 4363 - Directory Listing
Modified Wed Aug 9 14:32:14 2006 UTC (13 years, 4 months ago) by sh002i
append "1;" to these files, to satisfy Apache2.

Revision 4301 - Directory Listing
Modified Wed Jul 26 13:23:09 2006 UTC (13 years, 4 months ago) by dpvc
Allow matrices to be created from lists of vectors or points, or from
formulas returning vectors or points.

Revision 4300 - Directory Listing
Modified Wed Jul 26 13:18:25 2006 UTC (13 years, 4 months ago) by dpvc
Fixed a problem with derivatives of constant-valued Matrices (and
vectors and points).  They were incorrectly getting an extra level of
nesting.

Revision 4299 - Directory Listing
Modified Wed Jul 26 12:27:07 2006 UTC (13 years, 4 months ago) by dpvc
Extended the differentiation operator to handle multiple derivatives:

	  $f->D("x","y")    is the same as $f->D("x")->D("y")
	  $f->D(2)          is the same as $f->D->D
	  $f->D(2,"x")      is the same as $f->D("x")->D("x")

and so on.

Revision 4181 - Directory Listing
Modified Wed Jun 28 19:15:03 2006 UTC (13 years, 5 months ago) by jj
Fixed bug which caused warnings in problems containing hints and/or solutions
containing math (i.e., requiring images).

Revision 4144 - Directory Listing
Modified Fri Jun 23 22:07:44 2006 UTC (13 years, 5 months ago) by dpvc
Use tolerance flags from the Real object itself, if available, before
looking at the context.

Revision 4143 - Directory Listing
Modified Fri Jun 23 22:06:47 2006 UTC (13 years, 5 months ago) by dpvc
Fix some problems with the Diagonstics output for Formula objects.
(The tolerances using in the diagnostics didn't always match the ones
used in the actual testing, and the wrong values were sometimes
displayed when a multi-variable function was displayed as a graph.)

Revision 4134 - Directory Listing
Modified Mon Jun 19 15:13:33 2006 UTC (13 years, 5 months ago) by dpvc
Fixed grade_problem so taht is uses the safe compartment.  (This is
important because the problem can supply its own grader, and that code
shoudl be run in the safe compartment, just like the answer checkers
are.  Without this, graders could call PG_restricted_eval() and
actually get access to the full WW environment rather than the safe
compartment.)

Revision 4124 - Directory Listing
Modified Wed Jun 7 23:01:44 2006 UTC (13 years, 6 months ago) by gage
Make sure that WeBWorK::Constants has been loaded before this file is evaluated.

Revision 4093 - Directory Listing
Modified Tue May 23 11:51:55 2006 UTC (13 years, 6 months ago) by dpvc
Fixed a problem where a pick screen error was produced if a student
entered a vector-valued formula rather than a constant vector when
parallel answers are being checked and the student used the Preview
button to submit the answer.

Revision 4044 - Directory Listing
Modified Thu Apr 6 00:23:59 2006 UTC (13 years, 8 months ago) by dpvc
Fixed a bug that caused can error when a Complex1 object was passed to
the answer checker (rather than a string that needs to be parsed).

Revision 4043 - Directory Listing
Modified Thu Apr 6 00:20:01 2006 UTC (13 years, 8 months ago) by dpvc
Fixed getFlag so that it sodesn't accidentally create the {context}
field of an object that doesn't already have one (Perl will create
hashes that don't already exist if you reference them).  This was
causing problems with the ans_array processing

Revision 4028 - Directory Listing
Modified Sat Feb 18 22:42:55 2006 UTC (13 years, 9 months ago) by dpvc
Change check for zero from fuzzy check to strict check (when the
problem used absolute tolerances, in particular, this can causebig
problems).

Revision 3992 - Directory Listing
Modified Mon Jan 30 16:20:09 2006 UTC (13 years, 10 months ago) by dpvc
When checking for division by zero, don't do fuzzy check.

Revision 3915 - Directory Listing
Modified Tue Jan 17 02:20:19 2006 UTC (13 years, 10 months ago) by dpvc
Fixed problem with formula-valued matrices producing an error message
incorrectly.  (Was checking the wrong attribute of the entries.)

Revision 3913 - Directory Listing
Modified Tue Jan 17 01:56:24 2006 UTC (13 years, 10 months ago) by dpvc
Fixed problem with variables that are multiplied with no space between
them (e.g., "ax") that was introduced when I changed the pattern to
allow multi-letter variable names.

The solution is to first check against the defined names before
checking for the more complete name pattern.

Revision 3872 - Directory Listing
Modified Sat Dec 31 16:31:48 2005 UTC (13 years, 11 months ago) by dpvc
Added ability to supply a code reference (rather than a Value object)
for the typeMatch and extra fields for the List answer checker (and
the String answer checker).  This makes these more useful in
overriding the match for specific problems that want better error
messages, for example.

Revision 3871 - Directory Listing
Modified Sat Dec 31 16:29:29 2005 UTC (13 years, 11 months ago) by dpvc
Avoid error when a CODE reference is checked to see if it is a Value object.

Revision 3869 - Directory Listing
Modified Sat Dec 31 14:57:39 2005 UTC (13 years, 11 months ago) by dpvc
Added a new flag that controls how a list with a single entry that is
a list is handled.  In the past, the student could not specify such an
item, but now the default is to form a list with a single entry that
is a list, provided the student has used parens explicitly around his
list.  So "1,2" will be a list with two items and "(1,2)" will be a
list with one item (a list).  This improves the ability to use the
list checker for lists of arbitrary pairs (like "(1,max)") especially
when you want to check for lists of these (e.g., "(1,max),(2,min)"),
since otherwise a single pair "(1,max)" entered by the student would
become the list "1,max" rather than the list containing the single
pair.

If you really want "(1,max)" to become the list "1,max", use

   List("1,max")->cmp(implicitList=>0);

to prevent single lists from forming a list of a single item.

Revision 3868 - Directory Listing
Modified Sat Dec 31 02:42:46 2005 UTC (13 years, 11 months ago) by dpvc
Now that the Parser allows multi-letter variable names, there is no
need to handle C0 specially.

Revision 3866 - Directory Listing
Modified Sat Dec 31 01:39:54 2005 UTC (13 years, 11 months ago) by dpvc
Allow multi-letter variable names and names like x1, x2, etc.

Revision 3782 - Directory Listing
Modified Thu Dec 1 13:17:27 2005 UTC (14 years ago) by dpvc
Fixed a problem with not including parentheses when a negative number
is the base of a power. (And in general, when a negative is used as an
operand of a higher-precendence operation, but it really only affected
powers.)

Revision 3763 - Directory Listing
Modified Thu Nov 17 13:21:43 2005 UTC (14 years ago) by dpvc
Give better error messages when the entries in Points, Vectors and
Matrices are not of the right type.

Revision 3762 - Directory Listing
Modified Thu Nov 17 13:20:50 2005 UTC (14 years ago) by dpvc
Adjusted the parentheses slightly so that matrices will only be formed
in Matrix context, not Point or Vector context (this produced
confusing messages for students in some circumstances where they didn't
balence their parentheses correctly).

Revision 3754 - Directory Listing
Modified Sat Nov 12 00:30:31 2005 UTC (14 years, 1 month ago) by dpvc
Roll back Mike's change, since this can cause unwanted error messages
in list comparisons and other situations where the equality check
could compare different types of objects (for example) or where the
comparison could legitimately fail.  We only want to report errors
here when the user-supplied checker code fails.

This change would cause errors to be reported, for example, when the
user (incorrectly) entered a vector one time and then a formula
(correctly) the next time.  When the previous answer is checked against
the current one, this change would report an error rather than
silently ignoring the error, as it should.

Revision 3752 - Directory Listing
Modified Sat Nov 12 00:12:54 2005 UTC (14 years, 1 month ago) by gage
Changes to code checking whether the previous answer is equivalent to the current answer.
In this module additional code was answer to check for errors in the overloaded ==
in case the two Values can't be compared.

In PGanswermacros.pl the filter which handles "parse_previous_answer"
was modified to make sure the context is the same in the previous answer and the current answer.

Revision 3716 - Directory Listing
Modified Sun Oct 16 03:37:17 2005 UTC (14 years, 1 month ago) by dpvc
In the past, when Value objects were inserted into strings, they would
automatically include parentheses so that if you had $f equal to 1+x
and $g equal to 1-x, then Formula("$f/$g") would mean (1+x)/(1-x)
rather than 1+(x/1)-x, which is what would happen as a straing string
substitution.

The problem is that this would also happen for real numbers, vectors,
and everything else, even when it wasn't necessary.  So if $x=Real(3),
then "Let x = $x" would be "Let x = (3)".

I have changed the behavior of the string concatenation for Value
objects so that parentheses are only added in a few cases: for
Formulas, Complex numbers, and Unions.  This makes the other Value
objects work more like regular variables in strings, but might cause
some problems with strings that are used as formulas.  For example, if
$a = Real(-3), then "x + 2 $a" will become "x + 2 -3", or "x-1" rather
than the expected "x - 6".  (The old approach would have made it "x +
2 (-3)" which would have worked properly).  For the most part, it is
easier to use something like "x + 2*$a" or even "x" + 2*$a in this
case, so the extra trouble of having to avoid parentheses when you
really meant to substitute the value into a string didn't seem worth
it.

Revision 3715 - Directory Listing
Modified Sun Oct 16 03:27:35 2005 UTC (14 years, 1 month ago) by dpvc
Added a new experimental diagonstic function for the function answer
checker.  When enabled, it will produce graphs of the correct answer,
the student answer, and the absolute and relative errors, and will
list the data points used in the comparison, plus the numerical values
of the results and errors.

To enable the diagnostic, use

   ANS(fun_cmp($f,diagnostics=>1));

Note that only single-variable functions can be graphed at the moment,
so if you are using a multi-variable check, you need to disable the
graphing.  To do this use

   ANS(fun_cmp($f,vars=>['x','y'],diagnostics=>[showGraphs=>0]));

The diagnostic mode is only available for the Parser-based versions of
the function checker, and (of course) with the native Parser objects
as well:

   ANS(Formula($f)->cmp(diagnostics=>1));

There are now Context settings to control the diagnostics, which can
be set through Context()->diagnostics->set().  For example

   Context()->diagnostics->set(formulas=>{showGraphs=>0});

would turn off graphs for all functions comparisons.  Some of the
other values you can set are:

   formulas => {
     showTestPoints => 1,        # show the test points and function values
     showRelativeErrors => 1,    # show the relative errors for the student answer
     showAbsoluteErrors => 1,    # show the absolute errors for the student answer
     showGraphs => 1,            # show the various graphs
     graphRelativeErrors => 1,   #  show the relative error graph
     graphAbsoluteErrors => 1,   #  show the absolute error graph
     clipRelativeError => 5,     #  don't show relative errors above 5
     clipAbsoluteError => 5,     #  don't show absolute errors above 5
     plotTestPoints => 1,        #  include dots at the test points
     combineGraphs => 1,         #  show correct and student graphs in one image
   },
   graphs => {
     divisions => 75,       # the number of data points to plot
     limits => [-2,2],      # the lower and upper limit of the plot
                            #  (taken from the function limits if not provided)
     size => 250,           # pixel size of the image (could be [width,height])
     grid => [10,10],       # number of grid lines in each direction
     axes => [0,0],         # where to put axes relative to origin
   }

Any of these can be set in the Context(), or in the answer checker
itself.  If you set diagnostics to an array reference, the entries in
the array refer to element of the formulas hash.  If you set
diagonstics to a hash reference, then you can set values in either the
formulas or graphs hashes, as in:

   ANS(Formula($f)->cmp(diagnostics=>{
     formulas => {showAbsoluteErrors=>0},
     graphs => {size=>300, divisions=>100},
   }));

If you want all function checkers to show diagnostics, use

   Context()->diagonstics->set(formulas=>{show=>1});

The image file names are modified to include the current time so that
the names will be unique.  This avoids problems with the browser cache
showing a old image when a new one has been generated.  But this also
means that the temporary image directory will fill up fast, so you may
need to empty it if you use the diagnostic images frequently.

This is just a first attempt at a diagnostic feature.  I think it will
help when you are not sure if the tolerances are set properly, or if
you think a student answer should be markes correct but isn't, as it
will point out which point(s) are not being accepted.

Revision 3714 - Directory Listing
Modified Sun Oct 16 02:44:34 2005 UTC (14 years, 1 month ago) by dpvc
Modified context data objects to provide a copy method so that the
various types of data can copy themselves (and can provide a more
comprehensive copy if necessary).

Revision 3713 - Directory Listing
Modified Fri Oct 14 23:33:58 2005 UTC (14 years, 2 months ago) by dpvc
Let Parser object's cmp(debug=>1) option set the debug feature of the
answer evaluator.

Revision 3703 - Directory Listing
Modified Mon Oct 10 23:47:26 2005 UTC (14 years, 2 months ago) by dpvc
Add a new context flag that controls how the student answer should be
displayed.  The formatStudentAnswer flag can be set to 'evaluated'
(the default), which shows the final numeric answer; 'parsed', which
shows the fully parsed version (including extra parentheses for
clarity); or 'reduced', which performs constant operations, but
doesn't perform function evaluations or named-constant substitutions.

For example, if the student answers 1+2+sqrt(3), then 'evaluated' will
produce  4.73205, 'reduced' will show 3+sqrt(3), and 'parsed' will
show 1+2+sqrt(3).

Revision 3702 - Directory Listing
Modified Mon Oct 10 23:41:05 2005 UTC (14 years, 2 months ago) by dpvc
If constant functions are not being reduced, don't mark the function
call as constant (since otherwise it might be evaluated later accidentally).

Revision 3696 - Directory Listing
Modified Mon Oct 10 12:37:13 2005 UTC (14 years, 2 months ago) by dpvc
Fixed a bug where correct_ans could not be overridden in the cmp()
method for Lists.

Revision 3678 - Directory Listing
Modified Sat Oct 1 01:13:27 2005 UTC (14 years, 2 months ago) by dpvc
Handle the names of entries in Lists and Formulas returning lists
better.  Also do better typechecking on these lists.  Finally, allow
better typechecking for String objects that are being used when a
Formula answer is allowed.

Revision 3677 - Directory Listing
Modified Sat Oct 1 01:10:27 2005 UTC (14 years, 2 months ago) by dpvc
Allow context to override object class used to create formula objects
(so that things like ImplicitPlane can create instances of themselves
automatically when needed).

This mechanism needs to be enlarged to encompass the other Value
object classes as well (like the Context()->{parser}{...} hash).

The real problem is that the List object probably shouldn't create a
formula returning a list when it is passed formulas, since there
really isn't much need for a formula returning a list to be
autogenerated (you can create one by hand using Formula if needed).

Right now, ALL the Value objects make themselves into Formulas when
one of their entries is a formula.  For example, Point(1,"x") produces
the same thing as Formula("(1,x)"), and List(1,"x") is the same as
Formula("1,x").  This is good for points, but not so good for lists.
And it might sometimes be nice to have a Vector of Formulas, or a
Matrix with Formula entries (rather than Formulas returning Vectors or
Matrices).  But this would require some serious changes internally in
the Value objects, which make assumptions about their values being
constant.  Changing that will be for another day...

Revision 3676 - Directory Listing
Modified Sat Oct 1 00:59:06 2005 UTC (14 years, 2 months ago) by dpvc
Correctly create Formula returning List when a list has formula
entries.

Revision 3669 - Directory Listing
Modified Thu Sep 29 22:02:07 2005 UTC (14 years, 2 months ago) by dpvc
Fixed a problem with the automatic upgrading of object classes for
when Value objects are subclassed but are not entered into the
precedence list.

Revision 3655 - Directory Listing
Modified Mon Sep 26 04:11:25 2005 UTC (14 years, 2 months ago) by gage
Changed the numerical values of lbf to make it more accurate (assuming that lbf is an abbreviation for ft-lbs which I doubt).

Also replaced the conversion factor for pounds with a more accurate figure.

Revision 3652 - Directory Listing
Modified Sat Sep 24 00:47:30 2005 UTC (14 years, 2 months ago) by dpvc
Added ability to have answers that are empty strings.  String("") now
will produce a valid string object regardless of the Context's defined
string values.  (You can prevent this using

       Context()->flags->set(allowEmptyStrings=>0);

if you wish).  String("")->cmp will produce an answer checker for an
empty string (it removes the blank checker that WW installs).

Revision 3637 - Directory Listing
Modified Mon Sep 19 00:16:24 2005 UTC (14 years, 2 months ago) by dpvc
Prevent the empty list from having open and close be set to 'start'
(a value used internally).

Revision 3633 - Directory Listing
Modified Sat Sep 17 13:22:52 2005 UTC (14 years, 2 months ago) by dpvc
Don't allow wrapping in label for ans_array errors.

Revision 3631 - Directory Listing
Modified Sat Sep 17 13:02:24 2005 UTC (14 years, 2 months ago) by dpvc
The Parser answer checkers used to give the student answer as the
parsed but unevaluated answer.  This has been changed so that the
student answer is now the computed result, no the parsed answer.
The answer preview still shows the parsed equation.  This is more
consistent with the traditional answer checkers, and probably is more
valuable to the students.

Revision 3630 - Directory Listing
Modified Sat Sep 17 12:39:09 2005 UTC (14 years, 2 months ago) by dpvc
Better error messages for unreduced unions.

Revision 3629 - Directory Listing
Modified Sat Sep 17 12:25:38 2005 UTC (14 years, 2 months ago) by dpvc
Improved error message layout and labeling for when ans_array is used.

Revision 3628 - Directory Listing
Modified Sat Sep 17 12:22:25 2005 UTC (14 years, 2 months ago) by dpvc
Improved error messages for formulas returning infinity

Revision 3613 - Directory Listing
Modified Mon Sep 12 23:28:37 2005 UTC (14 years, 3 months ago) by dpvc
Fixed an error where scalar() was used on a hash ref.
Fixed a misfeature where operations on formulas could return Value
objects of other classes; they should always return formulas, even
when the formula is constant.

Revision 3612 - Directory Listing
Modified Mon Sep 12 20:26:01 2005 UTC (14 years, 3 months ago) by dpvc
Avoid undefined value of $name.

Revision 3603 - Directory Listing
Modified Wed Sep 7 01:10:58 2005 UTC (14 years, 3 months ago) by dpvc
Added support for cplx_cmp() using the Parser.  Move
lib/Parser/Legacy/PGcomplexmacros.pl to the pg/macros directory to use
it.  As with the other legacy macros, $useOldAnswerMacros can be
controlled to determine whether the new or the old macros are used.

There is a new mode 'strict_cartesian' that is parallel to
'strict_polar'.  You must enter a+bi form, but the a and b can have
operations within them.

Revision 3596 - Directory Listing
Modified Fri Sep 2 22:29:59 2005 UTC (14 years, 3 months ago) by dpvc
Fixed error in atan2 where second argument was not promoted to a Real.

Revision 3591 - Directory Listing
Modified Tue Aug 30 12:21:36 2005 UTC (14 years, 3 months ago) by dpvc
The perl method for UOP and BOP now put spaces around the operator, to
prevent Perl from thinking that things like -e is a file test and
*Parser::Function->call is a name reference.  (Some of these had been
done by hand earlier, but now the base BOP and UOP classes handle it,
so we should not have problems in the future).  I removed the ad hoc
fixes from several other locations (Parser/Function.pm,
Parser/Context/Default.pm).

Also extended the operator definitions to allow operators to create
function-call syntax in perl mode (for when the operator doesn't
correspond to a perl operator).

Revision 3589 - Directory Listing
Modified Tue Aug 30 00:44:53 2005 UTC (14 years, 3 months ago) by dpvc
Added the ability to put class-specific answer-checker defaults into
the Context object.  For example,

    Context("Vector")->{cmpDefaults}{Vector}{promotePoints} = 1;

would make all Vector answer checkers include promotePoints=>1
automatically.  (Note however that if a subclass of Vector is used, it
will not get this defaults, since its class name would be different.
Perhaps something more sophisticated will be needed in the future.)

Revision 3587 - Directory Listing
Modified Tue Aug 30 00:36:55 2005 UTC (14 years, 3 months ago) by dpvc
Added a Point context that is a copy of the Vector context.  This will
allow users to override some settings in Vector context (namely, how
they are entered and displayed) without preventing users from being
able to enter points (in Point context).

Revision 3578 - Directory Listing
Modified Fri Aug 26 14:06:39 2005 UTC (14 years, 3 months ago) by jj
Fix bug where perl functions which may need parentheses by forcing them
when the function starts Parser::Function->.  This seems to work, but
there might be a better way to do it, or need other cleaning up.

Revision 3576 - Directory Listing
Modified Thu Aug 25 20:01:25 2005 UTC (14 years, 3 months ago) by glarose
Add some electrical units.  Take two, hopefully in the correct branch
this time.

Revision 3574 - Directory Listing
Modified Thu Aug 25 18:32:01 2005 UTC (14 years, 3 months ago) by jj
Updated instructions to match changes to global.conf.dist and the move
or PGanswermacros.pl.

Revision 3573 - Directory Listing
Modified Thu Aug 25 18:24:55 2005 UTC (14 years, 3 months ago) by jj
A separate copy of this file is no longer needed.

Revision 3569 - Directory Listing
Modified Thu Aug 25 03:40:44 2005 UTC (14 years, 3 months ago) by dpvc
Fixed problem with Context's not properly initializing themselves with
the WW environment parameters (like zeroLevelTol and useBaseTenLog).
The copy method and the method that did an initialized copy used to be
separate routines, but that turned out to be unnecessary, so they have
now been merged (copy always tries to initialize the WW values when it
can, and when the copied context doesn't already have them).

The reason this is complicated is that a number contexts are set up
before the global.conf data is available, so these can't be
initialized with the WW values.  Also, these default contexts are
stored in the persistant processes, and we don't want to leave
possibly course-specific values lying around in them, so whenever a
context is selected, it is copied from the standard version and the
WW parameters are inserted into it.  The problem author can only
modify the copy, not the original, so this is OK with mod_perl.

The context's copy method now always tries to initialize (we used to
have to call initCoopy to get a copy that has the WW parameters
inserted).  That turned out to cause trouble with code that handled
contexts without the usual Context() command.

Revision 3568 - Directory Listing
Modified Thu Aug 25 03:32:16 2005 UTC (14 years, 3 months ago) by dpvc
Fixed log and log10 perl methods so that log obeys the useBaseTenLog
flag, and log10 doesn't try to call main::log10, which is not
available from within this preloaded package.  The in- and outside
the safe compartment stuff is very confusing, and functions that are
not overloaded native perl functions seem to be not callable from the
Value::Formula package, so the perl method now calls
Parser::Function->call() directly (doesn't look pretty, but I've given
up on that).

Revision 3562 - Directory Listing
Modified Wed Aug 24 19:07:10 2005 UTC (14 years, 3 months ago) by dpvc
Changed stringify to check for an answer that is zero by using the
zeroLevelTol value directly (rather than use the fuzzy equality check
for zero, which depends on the tolType in a bad way).

Revision 3560 - Directory Listing
Modified Wed Aug 24 11:44:49 2005 UTC (14 years, 3 months ago) by dpvc
Made relative tolerances the default for when the tolType is not one
of 'relative' or 'absolute'.

Revision 3536 - Directory Listing
Modified Sat Aug 20 23:07:13 2005 UTC (14 years, 3 months ago) by dpvc
Added code to handle the case where the professor's answer is in
expondential notation using a little e instead of a big one.  (Perl
will convert .0000001 to 1E-07, for example, before it is passed to
num_cmp.)

Revision 3531 - Directory Listing
Modified Mon Aug 15 22:42:37 2005 UTC (14 years, 3 months ago) by dpvc
Fixed more undefined values

Revision 3529 - Directory Listing
Modified Mon Aug 15 01:50:21 2005 UTC (14 years, 4 months ago) by dpvc
Changed Context() call to direct reference to context, so as not to
leave the wrong content selected as the current one.

Revision 3525 - Directory Listing
Modified Sun Aug 14 00:23:10 2005 UTC (14 years, 4 months ago) by dpvc
Added methods for testing containment of one set in another, and so
on.  These include:

     $A->contains($B)        Test if $B is a subset of $A (or an
                             element of $A if $B$ is a real number).

     $A->isSubsetOf($B)      Test if $A is a subset of $B.

     $A->isEmpty             True if $A is the empty set.

     $A->intersects($B)      True if $A and $B have numbers in common.

     $A->intersect($B)       The set of numbers common to both $A and $B.

Be careful of the difference between "intersect" and "intersects".
One is a set the other a true/false value.

Revision 3524 - Directory Listing
Modified Sun Aug 14 00:18:46 2005 UTC (14 years, 4 months ago) by dpvc
Added a copy method that produces a deep copy of the given object.
This probably should be used through the new() methods to ducplicate
the data used when creating an object, otherwise changes to the
sub-objects will cause changes to the outer one.  For example, if an
interval is used to create a union and then the internal data for the
interval is changed by hand, the changes will also occur in the
union.  That is, Value objects contain their data by REFERENCE.  This
should probably be changed, but fortunately, no one should be
adjusting the internal structure of the objects by hand.

Revision 3523 - Directory Listing
Modified Sat Aug 13 22:38:39 2005 UTC (14 years, 4 months ago) by dpvc
Added canBeInUnion and isSetOfReals methods to the Parser package
(similar to the ones in the Value package), replacing the
canBeInterval flag and other ad hoc checks.

Removed ability to form interval like [a] now that we have sets.

Revision 3522 - Directory Listing
Modified Sat Aug 13 22:34:31 2005 UTC (14 years, 4 months ago) by dpvc
Maintain parentheses correctly when converting to perl.

Revision 3518 - Directory Listing
Modified Sat Aug 13 21:34:50 2005 UTC (14 years, 4 months ago) by dpvc
Allow a list of numbers to be converted to a set.

Revision 3517 - Directory Listing
Modified Sat Aug 13 21:31:46 2005 UTC (14 years, 4 months ago) by dpvc
Pass the canBeInUnion call on to the Formula's root node

Revision 3516 - Directory Listing
Modified Sat Aug 13 20:59:28 2005 UTC (14 years, 4 months ago) by dpvc
Added isSetOfReals and canBeInUnion methods to the Value objects, and
replaced the ad hoc tests for these conditions to call these
routines.

Cleaned up the make() methods for Intervals, Sets and Unions, and
improved the new() methods to handle more cases better.

Fixed Value::makeValue() to handle an array reference correctly.

I don't THINK any of this will break anything.  :-)

Revision 3515 - Directory Listing
Modified Sat Aug 13 20:55:35 2005 UTC (14 years, 4 months ago) by dpvc
Make formulas that produce lists get default open and close parens,
and have them retained in Formula() results.

Revision 3514 - Directory Listing
Modified Sat Aug 13 19:10:41 2005 UTC (14 years, 4 months ago) by dpvc
Make sure the singletons are sorted before comparing them to the
intervals (and each other).

Revision 3512 - Directory Listing
Modified Sat Aug 13 18:19:01 2005 UTC (14 years, 4 months ago) by dpvc
Can't use the length check when reducing unions, since it could
contain a single set that is not reduced, and we need to check that,
too.

Revision 3511 - Directory Listing
Modified Sat Aug 13 17:50:11 2005 UTC (14 years, 4 months ago) by dpvc
Fixed reduction warnings for individual sets, intervals and unions (in
making it work for lists, I broke it for the single items).

Revision 3510 - Directory Listing
Modified Sat Aug 13 17:32:58 2005 UTC (14 years, 4 months ago) by dpvc
Fixed a problem with redefine when used with classes that store their
data in a on-standard form (i.e., by overridding the create()
method).  Now they can define uncreate() to get the original data back
for use with redefine().

Revision 3509 - Directory Listing
Modified Sat Aug 13 17:24:00 2005 UTC (14 years, 4 months ago) by dpvc
Fixed mad error message (change needed due to new message translation
facility).

Revision 3508 - Directory Listing
Modified Sat Aug 13 16:58:56 2005 UTC (14 years, 4 months ago) by dpvc
Added isReduced method to tell if a Union, Set or Interval is already
reduced.  Fixed up sort to use CORE::sort, and added sort and reduce
to Intervals, which do nothing, but are there for consistency.

Revision 3507 - Directory Listing
Modified Sat Aug 13 16:57:14 2005 UTC (14 years, 4 months ago) by dpvc
Fixed error in testing is a union is reduced (didn't test if sets
within a union were reduced properly).

Revision 3505 - Directory Listing
Modified Sat Aug 13 16:33:50 2005 UTC (14 years, 4 months ago) by dpvc
Added sort methods to Union and Set that return objects with their
data sorted.

Revision 3504 - Directory Listing
Modified Sat Aug 13 15:57:17 2005 UTC (14 years, 4 months ago) by dpvc
Moved the union and set reduction checks from cmp_equal to cmp_compare
so that the messages can be produced even in lists of unions.

Improved the message facilities for the list comparison so that
cmp_compare can make errors that refer to the number of the entry in
the student's answer (otherwise an extra "There was a problem with
your nth value" message needs to be prepended, which looks bad if it
can be avoided).

Use the "extra" answer checker to report syntax error messages in unordered
lists.

Revision 3500 - Directory Listing
Modified Sat Aug 13 01:39:14 2005 UTC (14 years, 4 months ago) by dpvc
Fixed typo in previous update.

Revision 3499 - Directory Listing
Modified Sat Aug 13 00:41:24 2005 UTC (14 years, 4 months ago) by dpvc
Added sets to the differentiation information (no derivatives allowed)

Revision 3498 - Directory Listing
Modified Sat Aug 13 00:35:11 2005 UTC (14 years, 4 months ago) by dpvc
Fixed a typo in an error message.

Revision 3497 - Directory Listing
Modified Sat Aug 13 00:25:27 2005 UTC (14 years, 4 months ago) by dpvc
Added ability for Unions and Sets to simplify themselves
(automatically or on demand), and added flags to the Context and
answer checkers to control these features.  The new Context flags
are

    reduceUnions                tells whether unions are automatically
                                reduced when they are created.

    reduceUnionsForComparison   tells whether unions are reduced
                                before comparing them for equality
                                or inequality (etc) if they aren't
                                reduced already.

    reduceSets                  tells whether redundent elements are
                                removed from sets as they are created.

    reduceSetsForComparison     tells whether sets are reduced before
                                comparing them.

All of these default to true.

The Interval, Set, Union, and List answer checkers not have two new
flags for controlling these values:

    studentsMustReduceUnions    tells whether unions and sets will be
                                counted as incorrect when they are not
                                reduced to non-overlapping intervals
                                and at most one set with no repeated
                                entries.

    showUnionReduceWarnings     tells whether an error message will
                                be produced for non-reduced unions and
                                sets, or if they will be marked wrong
                                silently.  (Not available in Lists.)

Both of these are true by default, since most professors probably want
their students to write intervals in reduced form.  (Is this true?)
This corresponds the the current behavior of the interval checkers,
which require the student's answer to be the same set of intervals as
in the professor's, but with the addition of an error message when the
student answer is not reduced.

Revision 3495 - Directory Listing
Modified Fri Aug 12 23:21:52 2005 UTC (14 years, 4 months ago) by dpvc
Fixed use of undefined value for $position in TeX and String methods.

Revision 3494 - Directory Listing
Modified Fri Aug 12 23:02:11 2005 UTC (14 years, 4 months ago) by dpvc
Made the 'R' constant in Interval context show up as a bold R in TeX
mode.

Revision 3493 - Directory Listing
Modified Fri Aug 12 22:56:04 2005 UTC (14 years, 4 months ago) by dpvc
Detect preview mode correctly for either WW1 or WW2.

Revision 3492 - Directory Listing
Modified Fri Aug 12 22:55:19 2005 UTC (14 years, 4 months ago) by dpvc
Adjust spacing.

Revision 3491 - Directory Listing
Modified Fri Aug 12 22:54:38 2005 UTC (14 years, 4 months ago) by dpvc
Mark function as constant if it is.

Revision 3488 - Directory Listing
Modified Fri Aug 12 17:40:07 2005 UTC (14 years, 4 months ago) by dpvc
Avoid problem with undefined value being passed to protectHTML.

Revision 3487 - Directory Listing
Modified Fri Aug 12 17:09:42 2005 UTC (14 years, 4 months ago) by dpvc
Changed how Intervals implement the requireParenMatch flag for the
interval and union answer checker.  (Use a Context flag rather than a
flag on the interval itself.)  Moved the getFlag method from
Formula.pm to Value.pm so it can be used by any object class.  New
feature where classes can add more context flags to set (and reset
after the answer checker runs).

Revision 3484 - Directory Listing
Modified Fri Aug 12 01:26:11 2005 UTC (14 years, 4 months ago) by dpvc
Removed erroneous dollar sign.

Revision 3483 - Directory Listing
Modified Fri Aug 12 01:21:48 2005 UTC (14 years, 4 months ago) by dpvc
Added redefine() function to complement undefine() for various
Context() values.  For example

      Context()->operators->undefine('+');

makes '+' undefined, but

      Context()->operators->redefine('+');

will put it back.  You can specify a context from which to take the
redefinition, and a name in that context, as in

      Context()->operators->redefine('U',from=>"Interval");
      Context()->operators->redefine('u',from=>"Interval",using=>"U");
      Context()->operators->redefine('U',from=>$content);

where $content is a reference to a Context object.

The undefine() function lets you undefine several items at once, as in

      Context()->operators->undefine('+','-');

For redefine, you must put multiple names in square brackets because
of the optional parmeters:

      Context()->operators->redefine(['+','-']);

Revision 3482 - Directory Listing
Modified Fri Aug 12 01:15:30 2005 UTC (14 years, 4 months ago) by dpvc
Fixed bug with missing fields in initialization.

Revision 3477 - Directory Listing
Modified Thu Aug 11 20:57:18 2005 UTC (14 years, 4 months ago) by dpvc
Added ability to subtract intervals, sets and unions.  Adjusted the
precedence of the union 'U' to be above _ and + so that things like
(1,5) U (7,10) - {8} U (2,3) will do ((1,5) U (7,10)) - ({8} U (2,3))
rather than the previous (1,5) U ((7,10) - {8}) U (2,3).  Finally,
added a constant 'R' to the Interval context that is equivalent to
(-inf,inf), so you can do things like R-{0} now.

Still need to work out reducing unions so that things like (1,3)U(2,4)
can become (1,4).

Revision 3474 - Directory Listing
Modified Thu Aug 11 14:37:18 2005 UTC (14 years, 4 months ago) by dpvc
Changes needed for new Set object, plus for moving string, TeX and
perl into Value.pm.  Also removed unneeded spaces in perl versions of
the constants (these were to fix problems with the minus sign, but
that is now being handled by the minus operators themselves).

Revision 3473 - Directory Listing
Modified Thu Aug 11 14:34:24 2005 UTC (14 years, 4 months ago) by dpvc
Changes needt for Set object, and fixed a bug with unions containing
constant intervals with non-constant ones.

Revision 3472 - Directory Listing
Modified Thu Aug 11 14:33:09 2005 UTC (14 years, 4 months ago) by dpvc
Changes needed to Set object.  Also, use Parser to handle unions
defined as strings rather than doing it by hand (that's the whole
point, isn't it?).  Added object promotion from lower-precedence
classes (for better error messages), and fixed up the comparison
routine.

Revision 3471 - Directory Listing
Modified Thu Aug 11 14:28:07 2005 UTC (14 years, 4 months ago) by dpvc
Changes needed for Set object, better handling of an interval given as
a string, and a few misc. fixes.

Revision 3470 - Directory Listing
Modified Thu Aug 11 14:25:53 2005 UTC (14 years, 4 months ago) by dpvc
Changes needed for new Set object, and moving of string, TeX and perl
methods to Value.pm

Revision 3469 - Directory Listing
Modified Thu Aug 11 14:23:16 2005 UTC (14 years, 4 months ago) by dpvc
Added changes needed for the new Set object.

Revision 3468 - Directory Listing
Modified Thu Aug 11 14:22:36 2005 UTC (14 years, 4 months ago) by dpvc
Added in the Set object class.  Also made more comprehensive defaults
for string, TeX and perl output, so these don't have to be subclassed
so often.  These handle looking up the open and close parens and
recursively handling the entries in a list-type object.

Revision 3467 - Directory Listing
Modified Thu Aug 11 14:20:31 2005 UTC (14 years, 4 months ago) by dpvc
Properly maintain open and close parens in emtpy lists.

Revision 3466 - Directory Listing
Modified Thu Aug 11 14:19:26 2005 UTC (14 years, 4 months ago) by dpvc
Added new Set object class to the Parser.  It implements a finite set
of real numbers, for use with unions and intervals.  E.g., (1,2) U {3}
or (1,2) U {3,4,5}.  You can created Set objects in your perl code via
the Set() command, e.g, Set(3,4,5) or Set("{1,2,3}").  You should set
the Context to Context("Interval") if you plan to use Set objects, as
this defined the braces to form sets (rather than using them as
parentheses, which is the default WW behavior).  Note that in Interval
context, you can NOT use braces as parentheses.

Current, Set objects are only allowed to be sets of numbers.  It would
be possible to extend that in the future.

Revision 3465 - Directory Listing
Modified Thu Aug 11 00:38:33 2005 UTC (14 years, 4 months ago) by dpvc
Make upper-case alias a hidden one (since it is not needed for the
pattern).

Revision 3464 - Directory Listing
Modified Thu Aug 11 00:37:35 2005 UTC (14 years, 4 months ago) by dpvc
Dereference aliases to aliases properly.

Revision 3460 - Directory Listing
Modified Wed Aug 10 15:07:12 2005 UTC (14 years, 4 months ago) by dpvc
Interval (and Union) checker now accepts requireParenMatch flag for
deciding whether the interval type must match.  Setting
requireParenMatch to 0 will let (1,2) match (1,2] or [1,2], etc.

Revision 3459 - Directory Listing
Modified Wed Aug 10 15:05:34 2005 UTC (14 years, 4 months ago) by dpvc
Cosmetic change.

Revision 3458 - Directory Listing
Modified Wed Aug 10 14:28:59 2005 UTC (14 years, 4 months ago) by dpvc
The Parser versions of num_cmp and fun_cmp incorrectly left the
current Context set to the base context used by the answer checker.
The Context is now correctly reset to the one in effect before the
call to num_cmp or fun_cmp.

Also removed some redundant values in if-then checks.

Revision 3446 - Directory Listing
Modified Mon Aug 1 15:14:20 2005 UTC (14 years, 4 months ago) by dpvc
Fixed a bug that would cause step() to produce an error when called on
a constant value.  Also, added fact() function that was defined in
Algparser but not in Parser (which uses x! notation).

Revision 3445 - Directory Listing
Modified Mon Aug 1 14:20:16 2005 UTC (14 years, 4 months ago) by dpvc
Added missing "step" function that was defined in the AlgParser but
not in the Parser.

Be sure to copy the updated PGanswermacros.pl to the pg/macros directory.

Revision 3444 - Directory Listing
Modified Mon Aug 1 13:10:52 2005 UTC (14 years, 4 months ago) by dpvc
Make List("1,2,3") work like List("1","2","3") rather than produce a
list with one element that is a list.

Revision 3443 - Directory Listing
Modified Mon Aug 1 12:42:21 2005 UTC (14 years, 4 months ago) by dpvc
Added postfilter to Parser-based implementation of NUM_CMP so that the
student's answer is updated to be the result of evaluating the answer
(when there is no error in evaluating the answer).  This correctly
reflects the behaviour of the original NUM_CMP.

Revision 3442 - Directory Listing
Modified Mon Aug 1 12:37:35 2005 UTC (14 years, 4 months ago) by dpvc
Fixed typo that caused hilighting of the position of errors to be lost.

Revision 3441 - Directory Listing
Modified Mon Aug 1 12:04:23 2005 UTC (14 years, 4 months ago) by dpvc
Updates to make mode=>'frac' properly emulate the original num_cmp
behavior (it now allows decimals and fractions instead of requiring a
fraction).  There is also a new LimitedNumeric-StrictFraction context
(not currently used) that disallows decimals and requires fractions.

Revision 3440 - Directory Listing
Modified Mon Aug 1 12:01:39 2005 UTC (14 years, 4 months ago) by dpvc
Folded in Mike's changes for status messages.

Revision 3426 - Directory Listing
Modified Fri Jul 29 19:44:04 2005 UTC (14 years, 4 months ago) by sh002i
Fix use of $SIG{__WARN__} and $SIG{__DIE__}.

* Each change to $SIG{__WARN__} and $SIG{__DIE__} is now dynamically
scoped with "local", rather than changing globally and then restoring at
the end of the block.

* The special value "DEFAULT" is used instead of sub {CORE::die(@_)} or
sub {CORE::warn(@_)} when preparing to eval STRING code.

* Where $SIG{__WARN__} and $SIG{__DIE__} are overridden to do
preprocessing with PG_errorMessage, the previously installed handlers
will be called instead of the built-in warn or die functions after
preprocessing occurs. (For example, the warn and die handlers defined in
Apache::WeBWorK or the warn handler defined in WeBWorK::PG will be
called.)

* The behavior in process_answers is modified so that the custom
handlers are installed once before the answer evaluation loop. This
causes them to be in effect during the setup/teardown code, but I don't
think this will be a problem.

Revision 3384 - Directory Listing
Modified Sat Jul 16 19:24:31 2005 UTC (14 years, 4 months ago) by jj
Fixed typo related to useBaseTenLog.

Revision 3374 - Directory Listing
Modified Wed Jul 13 01:46:49 2005 UTC (14 years, 5 months ago) by dpvc
Wrong correction in the previous commit.  Use CODE::push

Revision 3373 - Directory Listing
Modified Wed Jul 13 01:23:38 2005 UTC (14 years, 5 months ago) by gage
Made modifications that allow use of complex numbers in matrices.  You can
also LR decompose a non-square matrix.  Documentation is still needed
and further testing.

Revision 3372 - Directory Listing
Modified Wed Jul 13 01:22:43 2005 UTC (14 years, 5 months ago) by gage
Made modifications that allow the use of complex numbers in matrices

Revision 3370 - Directory Listing
Modified Tue Jul 12 22:29:53 2005 UTC (14 years, 5 months ago) by dpvc
A first pass at making parser error messages localizable.  The
Context()->{error}{msg} hash can be used to specify translations of
the standard messages.  For example,

    Context()->{error}{msg}{'Division by zero'} = "Don't divide by zero, dude!";
    Context()->{error}{msg}{'Function '%s' has too many inputs'} =
        "You passed too many arguments to '%s'";

(I didn't translate into another language, here, but you could do
that, too.)

The msg hash could also be used within answer checkers to make certain
answer messages more appropriate for the given type of expected answer.

Revision 3369 - Directory Listing
Modified Tue Jul 12 21:05:37 2005 UTC (14 years, 5 months ago) by dpvc
Fixed various perl compiler warnings (due to extra "my", and so on).

Revision 3367 - Directory Listing
Modified Tue Jul 12 02:02:46 2005 UTC (14 years, 5 months ago) by dpvc
Fixed problem with minus signs in formulas that are turned into perl
mode.  Perl needs extra spaces to avoid problems with -e type operators.

Revision 3364 - Directory Listing
Modified Fri Jul 8 21:45:14 2005 UTC (14 years, 5 months ago) by jj
Fixed typo in installation instructions.

Revision 3363 - Directory Listing
Modified Thu Jul 7 02:40:52 2005 UTC (14 years, 5 months ago) by gage
Added some pod documentation to this file.  It needs more -- several methods
of MatrixReal1 have been overridden

Revision 3360 - Directory Listing
Modified Tue Jul 5 22:13:16 2005 UTC (14 years, 5 months ago) by gage
Added some pod documentation

Revision 3353 - Directory Listing
Modified Tue Jul 5 01:43:30 2005 UTC (14 years, 5 months ago) by dpvc
Don't load Parser.pl (it causes trouble with the Matrix.pm module).
We only needed it because of the calls to Real() that were being used
by Formula objects, so have them call Value::Real directly.

be sure to get the latest versions of Parser and Value (including the
top-level Parser.pm and Value.pm) in order to use this update.

Revision 3352 - Directory Listing
Modified Tue Jul 5 01:38:19 2005 UTC (14 years, 5 months ago) by dpvc
Modified the perl() method to make calles to Value:: directly rather
than to the main:: stubs for creating Value objects.  This will make
it work better from within packages or when Parser.pl hasn't been
loaded.

A few things still won't work in this case; e.g., calls to Closed()
for intervals (these could be handled better using ->with()) and to
functions like Factorial and log10 that are defined in Parser.pl.

Finally, there should be better object-based control over what
routines are called to create these objects, so that subclasses of the
Value objects will be able to be generated correctly.

Revision 3351 - Directory Listing
Modified Tue Jul 5 00:31:57 2005 UTC (14 years, 5 months ago) by gage
Modified formatting

Revision 3350 - Directory Listing
Modified Tue Jul 5 00:08:54 2005 UTC (14 years, 5 months ago) by dpvc
Main file that calls in the legacy modules.

Revision 3349 - Directory Listing
Modified Mon Jul 4 22:11:08 2005 UTC (14 years, 5 months ago) by gage
Add comment

Revision 3348 - Directory Listing
Modified Mon Jul 4 20:18:40 2005 UTC (14 years, 5 months ago) by dpvc
Folded in Mike's changes to checkbox_cmp.

Revision 3347 - Directory Listing
Modified Mon Jul 4 20:12:22 2005 UTC (14 years, 5 months ago) by dpvc
This is an attempt at making the traditional answer checkers call the
new Parser in place of their original ones.  That is, if you follow
the instructions in the README file, then problems that use
std_num_cmp(), fun_cmp(), etc. will really be using the new Parser
instead of the original PGanswermacros.pl versions.

The old answer checkers are still available, and can be switched back
on a site-wide, course-wide, or problem-by-problem basis.  See the
README for details.

Revision 3345 - Directory Listing
Modified Mon Jul 4 19:49:06 2005 UTC (14 years, 5 months ago) by gage
Reworked some of the code for AnswerEvaluator

The messages printed out when using the debug flag should now
be somewhat better.

-- Mike

Revision 3344 - Directory Listing
Modified Mon Jul 4 19:39:37 2005 UTC (14 years, 5 months ago) by dpvc
Fixed problem with sorting (problem with $a, $b, I think).

Revision 3343 - Directory Listing
Modified Mon Jul 4 16:21:04 2005 UTC (14 years, 5 months ago) by dpvc
Handle TeX versions of variables whose names include underscores
better.

Revision 3342 - Directory Listing
Modified Mon Jul 4 15:53:26 2005 UTC (14 years, 5 months ago) by dpvc
Better messages when adaptive parameters are too big.

Revision 3341 - Directory Listing
Modified Mon Jul 4 15:43:53 2005 UTC (14 years, 5 months ago) by dpvc
Implement "remove trailing zeros" format, like in prfmt().  I still
think '%g' works better in most cases ('%f#' will print larger values
without using scientific notation, which is nice, but will print small
numbers like .000000005 as 0, even though the fuzzy comparison of this
to zero will not be true.)

Revision 3339 - Directory Listing
Modified Mon Jul 4 15:22:22 2005 UTC (14 years, 5 months ago) by dpvc
Don't use the overloaded Real class for doing adaptive parameter
checks (use non-fuzzy checks, since we are checking the fuzziness by hand).

Revision 3336 - Directory Listing
Modified Mon Jul 4 13:15:57 2005 UTC (14 years, 5 months ago) by dpvc
Change so as not to use raw HTML in the error messages.

Revision 3335 - Directory Listing
Modified Mon Jul 4 03:28:09 2005 UTC (14 years, 5 months ago) by dpvc
Allow Parser::Number::NoDecimals() to accept a context to be modified
(rather than always changing the curent context).

Revision 3334 - Directory Listing
Modified Sun Jul 3 20:10:37 2005 UTC (14 years, 5 months ago) by dpvc
Updates to allow string matches to be case-insensitive.  This is now
the default, and can be overridden in the Context by setting the
string's "caseSensitive" attribute.  e.g.:

	 Context()->strings->add("FooBar"=>{caseSensitive=>1});

would rewuire "FooBar" to be entered exactly as typed.

Revision 3333 - Directory Listing
Modified Sun Jul 3 20:06:33 2005 UTC (14 years, 5 months ago) by dpvc
Adjusted some spacing

Revision 3332 - Directory Listing
Modified Sun Jul 3 20:05:28 2005 UTC (14 years, 5 months ago) by dpvc
Fixed a bug in the enable/disable routines that would cause them to
always work on the current context rather than the one whose
enable/disable method was being called.

Revision 3328 - Directory Listing
Modified Fri Jul 1 15:52:36 2005 UTC (14 years, 5 months ago) by gage
Added commment

Revision 3322 - Directory Listing
Modified Wed Jun 29 02:47:40 2005 UTC (14 years, 5 months ago) by gage
Corrected how preview_latex_strings are handled when two
AnswerHashes are ANDed or ORed.

Revision 3298 - Directory Listing
Modified Thu Jun 16 15:32:02 2005 UTC (14 years, 5 months ago) by dpvc
New flag showAllErrors for when a custom checker is supplied.  This
will cause all errors generated in the user's code to be reported
(normally, messages from the Value and Parser packages are ignored).

Revision 3296 - Directory Listing
Modified Thu Jun 16 04:03:40 2005 UTC (14 years, 5 months ago) by dpvc
Fixed a problem with auto-generated functions getting an incomplete
variable list.

Revision 3295 - Directory Listing
Modified Thu Jun 16 00:52:13 2005 UTC (14 years, 5 months ago) by gage
Fixed documentation for $graph->size()

Revision 3291 - Directory Listing
Modified Wed Jun 15 22:00:32 2005 UTC (14 years, 5 months ago) by jj
Changed whitespace removal of TeX strings to safer version.

Revision 3274 - Directory Listing
Modified Thu Jun 9 11:16:01 2005 UTC (14 years, 6 months ago) by dpvc
Fixed Disable() and Enable() so that they can be called as

    Context()->functions->disable()
and
    Context()->functions->enable()

as well as

    Parser::Context::Functions::Disable()
and
    Parser::Context::Functions::Enable()

The former is the preferred syntax.

Revision 3273 - Directory Listing
Modified Mon Jun 6 02:32:20 2005 UTC (14 years, 6 months ago) by dpvc
Forgot to check hardcopy mode.  Fixed some problems with that.  The
answer array items have to turn off verbatim mode that is used when
answer are included in the hardcopy.  This causes paragraph breaks
between entries in a singleResult MultiPart that includes ans_arrays,
which make the output less pretty, but at least they show up.

Revision 3269 - Directory Listing
Modified Sun Jun 5 23:52:11 2005 UTC (14 years, 6 months ago) by dpvc
Added ability to have Matrix, Vector and Point objects produce input
arrays similar to the ones available in PGmatrixmacros.pg.  This
provides some substantial new functionality, and it may still have
some shaking down to do, but it should not affect the existing
functionality of the answer checkers.

To create an answer array for a matrix, vector or point, use the new
ans_array() or named_ans_array() methods of these objects.  For
example:

	Context("Matrix");
	$M = Matrix([1,2],[3,4]);

	BEGIN_TEXT
	\{$M->TeX\} = \{$M->ans_array\}
	END_TEXT

	ANS($M->cmp);

This creates a matrix, then prints it ans creates an answer array of
the appropriate size for the matrix.  The answer checker will
automatically know to handle the multiple entry blanks.

To used a named answer rule, use:

	Context("Matrix");
	$M = Matrix([1,2],[3,4]);

	BEGIN_TEXT
	\{$M->TeX\} = \{$M->named_ans_array('fred')\}
	END_TEXT

	NAMED_ANS(fred => $M->cmp);

Both methods also take an optional argument that specifies the width
of the answer rules.  The default is 5.

You can get a multi-input point or vector array as well, and you can
make column vectors as follows:

        Context("Vector");
	$V = ColumnVector("1+x","3x","1-x");

	BEGIN_TEXT
	\{$V->TeX\} = \{$V->ans_array\}
	END_TEXT

	ANS($V->cmp);

Note that you can make answer arrays for matrices and vectors of
formulas as well as constants, provided the formula is an explicit
matrix or vector of formulas, and is not obtained by matrix
arithmatic.

For concistencey, all objets now have ans_rule and named_ans_rule
methods as well.  The default width is 20 for these.

Revision 3267 - Directory Listing
Modified Sun Jun 5 23:25:20 2005 UTC (14 years, 6 months ago) by dpvc
Allow for vectors to be marked as Column Vectors.

Revision 3266 - Directory Listing
Modified Sun Jun 5 23:24:29 2005 UTC (14 years, 6 months ago) by dpvc
Better handling of delimiters that are explicitly set byt he user.
Fixed an incorrect call during object class promotion.
Added ability to sepcify that a vector is a Column Vector.

Revision 3265 - Directory Listing
Modified Sun Jun 5 23:22:20 2005 UTC (14 years, 6 months ago) by dpvc
Better handling of open and close delimiters that are explicitly set.

Revision 3264 - Directory Listing
Modified Sun Jun 5 23:18:01 2005 UTC (14 years, 6 months ago) by dpvc
Fix some incorrect calls when the promoting types to higher precedence
object types.

Revision 3263 - Directory Listing
Modified Sun Jun 5 23:08:32 2005 UTC (14 years, 6 months ago) by dpvc
Fixed a bug with Matrix->perl() method that would cause an extra level
of nesting in constant matrices.

Revision 3261 - Directory Listing
Modified Sat Jun 4 13:50:41 2005 UTC (14 years, 6 months ago) by dpvc
Avoid possible infinite loop with length and typeref calls.

Revision 3260 - Directory Listing
Modified Sat Jun 4 13:50:01 2005 UTC (14 years, 6 months ago) by dpvc
Remove unneeded comment.

Revision 3259 - Directory Listing
Modified Fri Jun 3 22:03:23 2005 UTC (14 years, 6 months ago) by dpvc
Added a ->with() method that lets you set fields of a Parser object as
you create it.  For example:

    $f = Formula("sqrt(x)")->with(limits=>[0,3]);

or

    ANS(Formula("(x+1)/x")->with(checkUndefinedPoints=>1,test_at=>[[0]])->cmp);

or

    ANS($f->with(test_points=>[[0],[1],[2]])->cmp);

Revision 3258 - Directory Listing
Modified Fri Jun 3 19:14:00 2005 UTC (14 years, 6 months ago) by dpvc
Better control over number of points that can be undefined, and
new ability to specify required test points plus additional random
ones.  (Previously, if you set the test points, no random points were
generated.)  For example:

     $f = Formula("(x^2-1)/(x-1)");
     $f->{test_at} = [[1]];  # test at x=1 plus random points

as opposed to

     $f->{test_points} = [[-1],[0],[1]];

which tests only the points x = -1, x = 0 and x = 1.

Revision 3257 - Directory Listing
Modified Thu Jun 2 22:50:24 2005 UTC (14 years, 6 months ago) by dpvc
Modified the Formula answer checker to allow checking of points where
the functions are undefined (i.e., attempt to check that the domains
agree).  This can be enabled by setting the checkundefinedPoints flag
in the Context(), or in the formula itself.  Test points where the
function is undefined will be retained and the student's answer will
have to be undefined at the same points.  If the points are selected
at random, the points where the function is undefined are kept in
addition to the ones where it is defined, so the required number of
test points where the function IS defined will still need to be
found.  The number of undefined points can be up to the number of
defined points.  This number can be reduced by setting the
max_undefined flag.  If you want to guarantee that a specific
undefined point be tested, you can provide that point using the
test_points field of the formula.  For example:

     Context()->flags->set(checkUndefinedPoints=>1);
     $f = Formula("(x^2-1)/(x-1)");
     $f->{test_points} = [[-1],[0],[1],[2]];
     ANS($f->cmp);

will guarantee that the singularity at x=1 is tested, so the answer
x+1 will not be marked as correct.

If an answer matches at all the test points where the functions are
both defined, but some of the undefind points differ between the two
functions, the answer checker will generate an error message
indicating that the domains of the functions don't agree.  (This is
ONLY generated with the functions match except for that.)  This can be
controlled by setting the showDomainErrors flag in the formula's cmp()
call:

     ANS($f->cmp(showDomainErrors=>0));

The default is to show these errors.

Revision 3256 - Directory Listing
Modified Thu Jun 2 19:53:06 2005 UTC (14 years, 6 months ago) by dpvc
Fixed an accidental hard-coded operation from always being "add" to
being the correct operation when promoting the operations to an object
of higher precedence.  (But since formulas are normally the highest
precedence, this will never have occurred.)

Revision 3221 - Directory Listing
Modified Mon May 2 00:58:00 2005 UTC (14 years, 7 months ago) by dpvc
During a call(), if the evaluation produced an error message generated
by Value::Error, report it, otherwise report a generic message.

Revision 3219 - Directory Listing
Modified Fri Apr 29 22:30:55 2005 UTC (14 years, 7 months ago) by dpvc
Added derivative of |x| as x/|x|.

Revision 3218 - Directory Listing
Modified Fri Apr 29 02:37:13 2005 UTC (14 years, 7 months ago) by dpvc
Fixed a bug with adaptive parameters where the relative tolerance
was not being properly computed.  This allowed large constants to be
treated as correct when they shouldn't be.

Revision 3217 - Directory Listing
Modified Wed Apr 27 21:30:13 2005 UTC (14 years, 7 months ago) by dpvc
Copy parameters like limits, etc, to the newly created formula when
'C0' is added by the "upToConstant=>1" option in formula cmp().

Revision 3216 - Directory Listing
Modified Wed Apr 27 21:29:10 2005 UTC (14 years, 7 months ago) by dpvc
Use correct form of "x" with lists (rather than hack using split()).

Revision 3214 - Directory Listing
Modified Sat Apr 9 18:33:07 2005 UTC (14 years, 8 months ago) by gage
Provide a default warning subroutine if none has been defined.

Revision 3210 - Directory Listing
Modified Thu Mar 31 19:44:49 2005 UTC (14 years, 8 months ago) by dpvc
Added a check that the coordinates are numeric.  This avoids an error
were <i+j+k> was accepted as OK.

Revision 3207 - Directory Listing
Modified Tue Mar 29 13:14:17 2005 UTC (14 years, 8 months ago) by dpvc
Handle error messages in the list checker better.  In particular, make
the error messages generated by custom checkers called on elements in
the list look better.  Also, in an ordered list, if the student enters
extra values, call an answer checker to do a syntax check.  (By
default, use the first element again, but the user can supply a
separate object to use for the checker using the extra=>object
option.)

Revision 3206 - Directory Listing
Modified Tue Mar 29 03:25:29 2005 UTC (14 years, 8 months ago) by dpvc
Compartmentalize the equality check one step further.  The cmp_equal
method now calls a new cmp_compare method to perform the actual
comparison (rather than use == directly).  The cmp_compare method
either calls a user-supplied checker routine, or defaults to using the
== operator.  The list checker also uses cmp_compare to check the
individual items in the list.  The list checker also calls a new
cmp_list_checker method to perform the list check.  This can be
overridden by a user-supplied list-checking routine.

To supply an alternate checking routine, use the "checker" option to
the cmp() method of the correct answer object.  For example:

    sub check {
      my ($correct,$student,$ans) = @_;
      return 0 unless $correct->length == $student->length;
      my ($x,$y) = $student->value;  # break up a point;
      return $x**2 - $y**2 = 1;      # check if it is on a hyperbola
    }
    Point(1,0)->cmp(checker=>~~&check);

This will check if the student's point lies on the given hyperbola.  All
the usual error messages will be issued if the student's answer is not
a point, or is of the wrong dimension, etc.

You can use

    sub list_check {
      my ($correct,$student,$ans) = @_;
      my @correct = @{$correct}; my @student = @{$student};
      ...
      return ($score,@errors);
    }
    List(...)->cmp(list_checker=>~~&list_check);

to replace the list-checking routine with your own custom one.  The
$correct and $student values are array references to the elements in
the lists provided by the professor and student.  (Note that you do
NOT get a List() object; this allows you to handle lists of formulas,
since a List of formulas becomes a formula returning a list).  The
checker routine should return the number of correct elements in the
student's list ($score), and a list of error messages produced while
checking the two lists (@errors).  (This is a list of messages, since
you might want to include an error for each entry in the list, for
example).

If your checker or list_checker routine wants to die with an error
message, use Value::Error(message).  This will put the message in the
WeBWorK display area at the top of the page.  If you use die(message),
or if the code fails due to a runtime error, then "pink screen of
death" will be produced indicating the error and asking the student to
report the error to the professor.

Revision 3205 - Directory Listing
Modified Tue Mar 29 02:55:10 2005 UTC (14 years, 8 months ago) by dpvc
Properly handle string values in postprocessing of vectors and other
related lists.  (It used to report a dimension error for things like 'NONE').

Revision 3204 - Directory Listing
Modified Mon Mar 28 23:47:50 2005 UTC (14 years, 8 months ago) by dpvc
Peroperly negate infinities even when reduceConstants is not in
effect.

Revision 3203 - Directory Listing
Modified Mon Mar 28 23:46:06 2005 UTC (14 years, 8 months ago) by dpvc
Handle extra parentheses better.

Revision 3202 - Directory Listing
Modified Mon Mar 28 23:45:27 2005 UTC (14 years, 8 months ago) by dpvc
Handle log as ln or log properly.

Revision 3194 - Directory Listing
Modified Wed Mar 16 13:35:01 2005 UTC (14 years, 8 months ago) by dpvc
removed a commented-out line that was no longer needed.

Revision 3193 - Directory Listing
Modified Wed Mar 16 13:33:59 2005 UTC (14 years, 8 months ago) by dpvc
Fixed a typo.

Revision 3192 - Directory Listing
Modified Wed Mar 16 13:30:28 2005 UTC (14 years, 8 months ago) by dpvc
Update the overloaded operators so that they can be overridden by
subclasses of the predefined object classes.  This involves calling
the objects method rather than using a hard reference to the routine
in the parent class.

Also, change the name of the string comparison routine to
compare_string to avoid conflicts with cmp that is used to produce the
answer checker for the class.

Finally, in Value.pm, promotePrecedence no longer has to do fancy
footwork to get "special" precedence to work (this was a hack to get
around the misfeature of the overloaded operators -- now that that is
being handled correctly, there is no need for it).

Revision 3187 - Directory Listing
Modified Sat Feb 26 23:03:12 2005 UTC (14 years, 9 months ago) by gage
Allow subclasses of AnswerEvalutor to be used.  Check for a match
with a substring AnswerEvaluator instead of equality.

Revision 3177 - Directory Listing
Modified Fri Feb 18 00:04:09 2005 UTC (14 years, 9 months ago) by dpvc
Missed one situation when making the previous update.  Fixed it.

Revision 3174 - Directory Listing
Modified Thu Feb 17 16:12:45 2005 UTC (14 years, 9 months ago) by dpvc
Fixed it so that direct calls to the add, sub, mult, etc functions
would work as expected (even though there is no need to call them directly).

Revision 3172 - Directory Listing
Modified Tue Feb 15 21:58:54 2005 UTC (14 years, 9 months ago) by dpvc
Updated the answer checkers so that you can more easily specify how
the correct answer shoudl be displayed.  In the past, you could use
something like Real(sqrt(2))->cmp(correct_ans=>"sqrt(2)") to do this,
but that is awkward.  Now the Compute() function (which parses and
then evaluates a string) sets things up so that the original string
will be what is used as the correct answer.  That means
Compute("sqrt(2)")->cmp will have the same result as the example
above.

You can also set the {correct_ans} properly of any Parser object to
have that value used as the correct answer.  For example

     $x = Real(sqrt(2));
     $x->{correct_ans} = "sqrt(2)";
     ANS($x->cmp)

would also produce the same answer checker as the two previous
examples.  All three methods should work.  Use the one that is most
convenient for you.

Revision 3171 - Directory Listing
Modified Tue Feb 15 21:53:23 2005 UTC (14 years, 9 months ago) by dpvc
Improved the Real(), Complex(), Point(), Vector(), Matrix() and
String() constructors so that they will process formulas passed to
them as strings rather than requiring perl objects for these.

For example, you can use Real("2/3") rather than Real(2/3) if you
want.  Also, Real("1+x") will return a formula returning a real
(essentially the same as Formula("1+x") in this case).

Revision 3166 - Directory Listing
Modified Tue Feb 15 02:20:52 2005 UTC (14 years, 9 months ago) by dpvc
Fixed an error with Matrix() that could cause it to loop infinitely
when bad data is passed to it.

Also, allow Matrix(), Point(), Vector(), and Real() to accept string
values that are evaluated to produce the value returned.

(Sorry, accidentally committed with a blank message.)

Revision 3165 - Directory Listing
Modified Tue Feb 15 02:16:10 2005 UTC (14 years, 9 months ago) by dpvc
*** empty log message ***

Revision 3093 - Directory Listing
Modified Sun Jan 16 00:52:49 2005 UTC (14 years, 10 months ago) by gage
Undoing some of the temporary changes I made to the warn message.

This may break what happens with xmlrpc however. (sigh)

Revision 3074 - Directory Listing
Modified Tue Jan 4 17:56:33 2005 UTC (14 years, 11 months ago) by dpvc
Fixed index problem with matrix multiplciation.  (It was returning the
transpose!)

Revision 3071 - Directory Listing
Modified Sat Jan 1 22:29:41 2005 UTC (14 years, 11 months ago) by gage
Temporary modifications which allow the Warning mechanisms to work when
using the XML access methods.

This needs to be looked at again.  There is also a problem with defining
permissions for creating directories.  There is a temporary #FIXME
that seems to work.

Revision 2991 - Directory Listing
Modified Tue Nov 9 15:23:38 2004 UTC (15 years, 1 month ago) by gage
Defined some variables that were causing warning messages.
Someone more familiar with this script should look at this
to make sure that this subsection of the parser is working correctly.

-- Mike

Revision 2985 - Directory Listing
Modified Wed Nov 3 22:39:21 2004 UTC (15 years, 1 month ago) by dpvc
Fixed a bug in processing absolute values with implicit
multiplication.

Revision 2969 - Directory Listing
Modified Tue Nov 2 01:55:21 2004 UTC (15 years, 1 month ago) by dpvc
Fixed typo in a comment.

Revision 2938 - Directory Listing
Modified Tue Oct 19 00:24:47 2004 UTC (15 years, 1 month ago) by dpvc
Added reduction rules to remove redundent negatives.
Override string and TeX methods that avoid redundent parentheses.

Revision 2937 - Directory Listing
Modified Tue Oct 19 00:23:01 2004 UTC (15 years, 1 month ago) by dpvc
Added "areParallel" method as a synonym for "isParallel".

Revision 2936 - Directory Listing
Modified Tue Oct 19 00:22:07 2004 UTC (15 years, 1 month ago) by dpvc
Don't promote an object unless it is a Value object.

Revision 2916 - Directory Listing
Modified Wed Oct 13 18:41:07 2004 UTC (15 years, 2 months ago) by dpvc
Clear error messages before doing the answer check (this clears old
messages left over inclass this checker is called by another one,
e.g. when using UNORDERD_ANS()).

Revision 2915 - Directory Listing
Modified Wed Oct 13 03:31:17 2004 UTC (15 years, 2 months ago) by dpvc
Trap errors in functions that are not native perl functions (like
acos() and csc(), etc.).  In the past, if an error occurred within the
definition of a function, the error message that was reported was the
internal error within the definition of the function.  For example
csc(0) would report "illegal division by zero", while acos(-2) would
report "can't take sqrt of -3".  Now the errors will be "can't take
csc of 0" and "can't take acos of -2".

Revision 2914 - Directory Listing
Modified Wed Oct 13 02:41:33 2004 UTC (15 years, 2 months ago) by dpvc
Added support for useBaseTenLogs to make log() work like ln() or
log10() depending on the value in the course.conf file.

Also fixed a bug that caused the WeBWorK parameters not to be
copied into contexts by initCopy().

Revision 2909 - Directory Listing
Modified Tue Oct 12 20:49:25 2004 UTC (15 years, 2 months ago) by dpvc
In Complex context, make sqrt() and log() of negative numbers return
their complex values.  Also make ^ and ** do the same with negative
bases.  These can be controlled by setting/clearing the
"negativeIsComplex" entry for these functions and operators.

Revision 2908 - Directory Listing
Modified Tue Oct 12 20:46:43 2004 UTC (15 years, 2 months ago) by dpvc
Report errors for powers of negative numbers rather than return 'nan'.
Don't allow 'nan' to be made into a Real object.

Revision 2907 - Directory Listing
Modified Tue Oct 12 20:44:20 2004 UTC (15 years, 2 months ago) by dpvc
In StandardPrecedence mode, make the precedence of function apply
match that in use by that AlgParser.

Revision 2900 - Directory Listing
Modified Tue Oct 12 00:52:47 2004 UTC (15 years, 2 months ago) by dpvc
Don't give coordinate hints during parallel vector checks.  Also fixed
a typo.

Revision 2842 - Directory Listing
Modified Wed Sep 29 15:47:30 2004 UTC (15 years, 2 months ago) by dpvc
Allow string constants to include spaces.

Revision 2832 - Directory Listing
Modified Mon Sep 27 17:47:04 2004 UTC (15 years, 2 months ago) by dpvc
Fix problem with TeX output of implicit multiplication between
items that would put two digits next to each other (like 2 3^2).

Revision 2823 - Directory Listing
Modified Thu Sep 23 21:09:14 2004 UTC (15 years, 2 months ago) by dpvc
Fixed Parser so that you can replace the Formula class as well as the
other object types.

Revision 2803 - Directory Listing
Modified Sun Sep 19 15:11:08 2004 UTC (15 years, 2 months ago) by dpvc
The $Parser::class variable was being handled after the "use"
statements at the end, so had to put a BEGIN around it.

Revision 2802 - Directory Listing
Modified Sun Sep 19 14:43:32 2004 UTC (15 years, 2 months ago) by dpvc
Eliminated unneeded parentheses in TeX output when unary minus and
plus are used with fractions.

Revision 2801 - Directory Listing
Modified Sun Sep 19 14:41:57 2004 UTC (15 years, 2 months ago) by dpvc
More changes for the isZero and isOne checks.  (Missed this file when
I committed the others.)

Revision 2800 - Directory Listing
Modified Sun Sep 19 14:27:39 2004 UTC (15 years, 2 months ago) by dpvc
Added isZero and isOne checks for Parser::Value objects (i.e., for
constants within formulas).  These now correctly handle vector and
matrices, in particular.  The isOne and isZero checks are used in the
reduce() method to simplify formulas.

Revision 2799 - Directory Listing
Modified Sun Sep 19 11:49:32 2004 UTC (15 years, 2 months ago) by dpvc
Added a new flag to the Formula()->cmp answer checker that allows a
constant-valued formula to be evaluated and then use the checker for
the resulting type.  This is useful when you want the correct answer
for a numeric check to be shown in a symbolic form (like "pi/4")
rather than as a decimal number.  To do this, use

       Formula("pi/4")->cmp(eval=>1);

rather than Real(pi/4)->cmp, which would show the correct answer as
0.785398.  Note that Formula("pi/4")->cmp would also match against
pi/4, but it does it as a function rather than a number, so error
messages might be issued indicating that the checker is expecting a
formula that returns a number, rather than just a number; this might
be confusing to a student.  It would also accept answers like
"pi/4-x+x" as correct, whereas with eval=>1 this would produce an
error message saying that the answer was supposed to be a number not a
formula returning a number.

Similarly, if you want to show sqrt(2)/2 as the correct answer, use

     Context()->flags->set(reduceConstants=>0, reduceConstantFunctions=>0);
     Formula("sqrt(2)/2")->cmp(eval=>1);

The first line tells the parser not to automatically reduce
expressions that only involve constants, so that the value of the
formula in the second line will not be reduced to a decimal before
the cmp method is called.

Revision 2798 - Directory Listing
Modified Sun Sep 19 11:29:06 2004 UTC (15 years, 2 months ago) by dpvc
Make Formula()->eval return a Real (ie, aValue::Real object) rather
than a perl number.  That way, you can use $f->eval->cmp rather than
needing Real($f->eval)->cmp, and so on.

Also make Formula()->perl do the same, for consistency.

(This could have been accomplished by having the Parser::Number class
evaluate to a Real, but for efficiency during computation, we put
off making the Real object until the end.  It probably doesn't make
that big a difference, but every little bit helps.)

Revision 2797 - Directory Listing
Modified Sun Sep 19 01:16:10 2004 UTC (15 years, 2 months ago) by dpvc
File needed to reduction flags that was accidentally left out of the
previous commit.  Sorry!

Revision 2796 - Directory Listing
Modified Sun Sep 19 01:15:03 2004 UTC (15 years, 2 months ago) by dpvc
Added flags that control the reductions performed by
Formula()->reduce.  Each reduction operation can be individually
enabled or disabled in the context, and in the reduce() call itself.

More complex reductions need to be developed.

Revision 2795 - Directory Listing
Modified Sat Sep 18 23:16:37 2004 UTC (15 years, 2 months ago) by dpvc
Fixed typo in addParens method name.

Revision 2791 - Directory Listing
Modified Thu Sep 16 23:43:54 2004 UTC (15 years, 2 months ago) by dpvc
Don't reduce constants in the display of student answers (so they can
tell how the parser interprets their answer).  The drawback is that
the final number is not displayed.  (We may need to add more columns
to the results display.)

Revision 2790 - Directory Listing
Modified Thu Sep 16 23:03:03 2004 UTC (15 years, 2 months ago) by dpvc
Use extra parens in the string version of the student's answer, but
not in the professor's (unless the problem sets the showExtraParens
flag).

Revision 2789 - Directory Listing
Modified Thu Sep 16 22:24:32 2004 UTC (15 years, 2 months ago) by dpvc
Added context flags to control automatic reduction of operations that
involve only constant values.  The default is to combine constants,
but this can now be disabled.

Also added a new flag to control the addition of extra parentheses
that make string values painfully unambiguous (these are for
situations that students tend to get wrong).  By default this is
turned off (so that professor answers won't contain excessive
parentheses), but the answer checker will be made to turn this on for
student answers.

Finally, when extra parens are added to formulas, they alternate
between ( ) and [ ] to make it easier to read.

Revision 2788 - Directory Listing
Modified Thu Sep 16 22:19:59 2004 UTC (15 years, 2 months ago) by dpvc
Produce an error when attempting to auto-create a formula using a
function that has been removed from the current context.

Revision 2772 - Directory Listing
Modified Sun Sep 12 11:11:47 2004 UTC (15 years, 3 months ago) by dpvc
Make partial credit in list answer checkers be the default (now that
WeBWorK can handle this).

Revision 2771 - Directory Listing
Modified Sat Sep 11 17:11:29 2004 UTC (15 years, 3 months ago) by dpvc
Fixed a bug with constants where the values were being cached so that
changes in the context were not being reflected in the formulas that
use them.

Revision 2768 - Directory Listing
Modified Fri Sep 10 23:55:31 2004 UTC (15 years, 3 months ago) by dpvc
When creating formulas from functions, don't evaluate even if the
formula is constant.  (This makes it possible to create automatically
create formulas even if they only contain constants.)

Revision 2757 - Directory Listing
Modified Fri Sep 10 14:50:14 2004 UTC (15 years, 3 months ago) by dpvc
No longer produces the message that there are too many answers if
hints are being shown about individual entries in a list.  (This gave
away the answer about which ones to remove.)

Revision 2756 - Directory Listing
Modified Fri Sep 10 14:48:35 2004 UTC (15 years, 3 months ago) by dpvc
Changed the error message produced for functions that have been
removed from the parser.  I hope this will be more appropriate for
students.

Revision 2746 - Directory Listing
Modified Wed Sep 8 02:00:52 2004 UTC (15 years, 3 months ago) by dpvc
Fixed error where AlgParser produces \sech and \csch, which are not
defined in TeX.  This fixes bug #665.

Revision 2701 - Directory Listing
Modified Sat Aug 28 15:53:09 2004 UTC (15 years, 3 months ago) by dpvc
Only convert (f(x))^2 to f^2(x) for specified functions f
(as marked in the Context).

Revision 2698 - Directory Listing
Modified Sat Aug 28 13:52:33 2004 UTC (15 years, 3 months ago) by dpvc
Add better error reporting in PG translator.  In particular, these
changes add two new features:

	1)  produce a full stack trace when a .pg file dies, and
	2)  convert (eval nnn) references to filenames, when
	    possible, in warn and die messages while processing a
	    .pg file.

There is also a change in the webwork tree that is needed to make this
all work, so be sure to apply updates in both trees.

Revision 2697 - Directory Listing
Modified Sat Aug 28 12:43:57 2004 UTC (15 years, 3 months ago) by dpvc
Two more minor TeX improvements.

Revision 2696 - Directory Listing
Modified Sat Aug 28 12:34:56 2004 UTC (15 years, 3 months ago) by dpvc
Improved TeX and string output in a number of situations.  Improved
use of parentheses to avoid things like x+-3.  Fixed wrong parentheses
in powers.  Display (sin(x))^2 as sin^2(x) in TeX output.

Revision 2692 - Directory Listing
Modified Fri Aug 27 21:49:36 2004 UTC (15 years, 3 months ago) by dpvc
Use the current context if the answer doesn't have one itself (like
with Value objects).

Revision 2688 - Directory Listing
Modified Fri Aug 27 19:42:59 2004 UTC (15 years, 3 months ago) by dpvc
Added in functMaxConstantOfIntegration support in the adaptive
parameter answer checking.  Also added a flag to the formula answer
checker that allows checking a formula up to a constant (for
integration problems).  This really just adds a new parameter to the
context and adds that to the formula, so there is nothing deep about
this.

	ANS(Formula("2x")->cmp(upToConstant=>1));

Finally, don't look for adaptive parameters if they aren't actually
used in the professor's formula (even if they are defined).

Revision 2687 - Directory Listing
Modified Fri Aug 27 00:28:27 2004 UTC (15 years, 3 months ago) by dpvc
Added ability to have linear adaptive parameters in the function
answer checker.  It only works for real-valued functions, though.
To use a parameter, use

       Context()->variables->add(a=>'Parameter');

and then use 'a' as a variable within your answer.  The student will
not be allowed to enter the parameter, but the professor will.

Note that the correct answer will show the full professor's answer,
including the parameters, even though the student can't type it.  Is
this the right behaviour?

Revision 2684 - Directory Listing
Modified Tue Aug 24 21:35:21 2004 UTC (15 years, 3 months ago) by dpvc
Added the makeUnion call that was removed earlier.  The AnswerChecker
for formulas sometimes called it (when the student's answer is constant).

Revision 2682 - Directory Listing
Modified Tue Aug 24 03:36:54 2004 UTC (15 years, 3 months ago) by dpvc
Fixed a bug with  sin^2 x  that introduced when I adjusted the
error report for implied multiplication.

Revision 2681 - Directory Listing
Modified Tue Aug 24 03:34:47 2004 UTC (15 years, 3 months ago) by dpvc
TeX mode now adds parentheses around fractions, when needed.

Revision 2680 - Directory Listing
Modified Tue Aug 24 03:33:30 2004 UTC (15 years, 3 months ago) by dpvc
Made string function look for a string field in teh definition of the
function as an override for its name. (This way, you can make asin
appear as arcsin or even sin^(-1) if you want).

Revision 2679 - Directory Listing
Modified Tue Aug 24 03:31:47 2004 UTC (15 years, 3 months ago) by dpvc
Fixed wrong error messages when operators are undefined in a context.

Revision 2678 - Directory Listing
Modified Mon Aug 23 23:55:37 2004 UTC (15 years, 3 months ago) by dpvc
Modified the parser so that the classes for the various object
constructors are stored in the context table rather than hard-coded
into the parser.  That way, you can override the default classes with
your own.  This gives you even more complete control to modify the
parser.  (You had been able to replace the definitions of operators,
functions and list-like objects, but could not override the behaviour
of numbers, strings, variables, and so on.  Now you can.)

This effects most of the files, but only by changing the name of the
calls that create the various objects.

There are also a couple of other minor fixes.

Revision 2676 - Directory Listing
Modified Mon Aug 23 05:00:16 2004 UTC (15 years, 3 months ago) by dpvc
Better highlighting for syntax error involving implied
multiplication.  (No highlighted had been done in the past.)

Revision 2675 - Directory Listing
Modified Mon Aug 23 04:59:05 2004 UTC (15 years, 3 months ago) by dpvc
Get the type right when evaluating an AbsoluteValue and obtaining a
Value object.

Revision 2674 - Directory Listing
Modified Mon Aug 23 04:58:00 2004 UTC (15 years, 3 months ago) by dpvc
Remove more lines in error messages produced while evaluation student
answers.

Revision 2673 - Directory Listing
Modified Mon Aug 23 01:21:27 2004 UTC (15 years, 3 months ago) by dpvc
Moved WW-specific routines from Parser.pm to WeBWorK.pm.
Changed error reporting when the error message was not generated by
the parser directly.  (The stack trace and line number references are
removed before the error is reported.)

Revision 2672 - Directory Listing
Modified Sun Aug 22 22:46:14 2004 UTC (15 years, 3 months ago) by dpvc
Added easy calls to disable/enable collections of functions or
individual functions in the current context.  So you can say

	   Parser::Context::Functions::Disable('Trig');

to disallow the use of trig functions, or

	   Parser::Context::Functions::Disable('Trig','Numeric');
	   Parser::Context::Functions::Enable('sqrt');

to disable trig and numeric functions (like log, exp, abs, etc) but
allow sqrt.

Note that disabling sqrt() does not disable x^(1/2) (this must be done
through disabling the ^ and ** operators), and disabling abs() does
not disable |x| (which must be done by removing the '|' definition
from the Context's parens list).

Revision 2671 - Directory Listing
Modified Sun Aug 22 21:18:06 2004 UTC (15 years, 3 months ago) by dpvc
Fixed some inconsistencies between handing of matrices within the
parser and Value packages.  Added a predefined Matrix context.

Revision 2670 - Directory Listing
Modified Sun Aug 22 16:06:28 2004 UTC (15 years, 3 months ago) by dpvc
Had the default granularity the wrong direction.

Revision 2669 - Directory Listing
Modified Sun Aug 22 15:42:50 2004 UTC (15 years, 3 months ago) by dpvc
Made the granularity of the test-point intervals be a parameter that
can be set on a global or variable-by-variable basis, so this is now
controlable from the .pg file.  For example:

            Context("Numeric")->variables->are(
              k=>{limits=>[1,10], resolution=>1},
              x=>{limits=>[-2,2], granularity=>1000},
            );

will make k be a variable that will only take on integer values
between 1 and 10, and x a variable that will take on one of 1000
different values evenly spaced between -2 and 2 (so resolution is
4/1000 in this case).

These parameters can also be set for an individual formula:

           $f = Formula("k^2-1");
           $f->{resolution} = 1;
           $f->{limits} = [0,10];

Revision 2668 - Directory Listing
Modified Sun Aug 22 02:55:38 2004 UTC (15 years, 3 months ago) by dpvc
Fixed TeX output of Matrices to use \array rather than \matrix for
matrices with formulas as entries (this had already been fixed for
constant matrices).  Made intervals produce formulas when of of the
endpoints is a formula.  Removed unneeded comment.

Revision 2667 - Directory Listing
Modified Sun Aug 22 02:51:53 2004 UTC (15 years, 3 months ago) by dpvc
Added support for dimension warnings in the answer checker for
formulas that return points, vectors or matrices.

Revision 2666 - Directory Listing
Modified Sun Aug 22 00:56:32 2004 UTC (15 years, 3 months ago) by dpvc
Formulas can now be compared even if their variables are complex
numbers, or even points or vectors!  This makes it possible to ask
students for complex functions like z^2+i and so on.

You can specify limits for variables either via
Context()->variables->set(x=>{limits=>[0,1]})  (for reals) or
Context()->variables->set(z=>{limits=>[[-2,2],[0,1]]}) (for complexes).
Similarly for points and vectors (where the number of sub arrays
depends on the dimension).  You can also give the limits for a
specific formula by assigning to its ->{limits} field:

    $f = Formula("sqrt(x-10)");
    $f->{limits} = [10,12];

There are now named variable types for 'Point2D', 'Point3D',
'Vector2D' and 'Vector3D', in addition to 'Real' and 'Complex'.
You can also specify a variable type by giving an explicit instance of
a value of the given type.  E.g.

    Context()->variables->add(x=>'Real',y=>0);     # two real variables
    Context()->variables->add(z=>'Complex',w=>i);  # two complexes
    Context()->variables->add(r=>Vector(0,0,0));   # a vector in R^3
    Context()->variables->add(X=>'Vector3D');      # a vector in R^3

There still needs to be more error checking in processing
user-supplied limits, but I'm not sure how much overhead is worth it.

Revision 2665 - Directory Listing
Modified Sun Aug 22 00:41:44 2004 UTC (15 years, 3 months ago) by dpvc
Made the default context be Numeric context rather than Full context.
Since there is only one variable in this context, it will speed up
function answer checking.  It will also encourage you to choose the
correct context explicitly.

Also changed Complex context to have z as the only variable.  If you
want x and y as reals, you need to add them in by hand.  Again, this
is for efficiency in answer checking.

Revision 2664 - Directory Listing
Modified Sat Aug 21 22:02:14 2004 UTC (15 years, 3 months ago) by dpvc
Added a file to perform WeBWorK-specific modifications to the
Parser/Value packages.  (I've tried to make these independent of
WeBWorK, so you can use them in other perl code if you want to.)

The parameters for fuzzy reals and some of the other parameters now
are taken from the pg->{ansEvalDefaults} values (as defined in
global.conf or course.conf).  More still needs to be done with this,
however.

Revision 2661 - Directory Listing
Modified Fri Aug 20 15:56:56 2004 UTC (15 years, 3 months ago) by dpvc
A number of fixes to make handing lists work better.  In particular,
you can now specify checks for whether the right kinds of parentheses
(or none at all) are used on the student's answer.  Some of the flags
for the list checker have been changed to accommodate this.

Revision 2660 - Directory Listing
Modified Fri Aug 20 15:52:32 2004 UTC (15 years, 3 months ago) by dpvc
A number of adjustments to get negative infinities to work better.
They used to be stored as separate Parser strings, but now they are
flagged versions of a single string.

All of the problems are really due to the fact that there is no
Infinity class in the Parser (only a Value version).  That should be
changed, but will require some work, and can be put off for now.

It would be best if the classes within the two packages would match up
nearly 1-to-1, but for historical reasons, they don't.  Since the
introduction of Real, String and Infinity classes to the Value
package, The Infinity class is the one main difference between the
two, and once that is fixed, everything needs to be looked over to
check for unnecessary complications due to the historical lack of classes
in one or the other package.

Revision 2658 - Directory Listing
Modified Fri Aug 20 11:17:06 2004 UTC (15 years, 3 months ago) by dpvc
Make blank patterns be ^$ (which should never match) rather than empty
(which always matches).  this fixes a problem where if a context has
no functions, for example, the parser would attempt to create function
calls to a function named ''.

Revision 2657 - Directory Listing
Modified Fri Aug 20 11:13:51 2004 UTC (15 years, 3 months ago) by dpvc
Handle trapped error messages that are not produced by the parser
error reporter (i.e., by bugs within the parser itself).  Also added
an error if implied multiplication is attempted when the operator for
it is not defined in the current context.

Revision 2656 - Directory Listing
Modified Fri Aug 20 02:13:38 2004 UTC (15 years, 3 months ago) by dpvc
We need to protect the HTML in the professor's answer so that if it
contains <, for example, it won't disappear.

Revision 2655 - Directory Listing
Modified Fri Aug 20 02:11:50 2004 UTC (15 years, 3 months ago) by dpvc
Fixed typo.

Revision 2654 - Directory Listing
Modified Fri Aug 20 02:11:08 2004 UTC (15 years, 3 months ago) by dpvc
Avoid possible infinite recursion in promotePrecedence() when special
precedence is used.

Revision 2653 - Directory Listing
Modified Thu Aug 19 17:31:18 2004 UTC (15 years, 3 months ago) by dpvc
Fixed error with handling of +infinity and -infinity.
(They had been defined as strings, but now we can let the + and -
operators handle them).

Revision 2650 - Directory Listing
Modified Thu Aug 19 14:23:00 2004 UTC (15 years, 3 months ago) by dpvc
Added Parser::Number::NoDecimals() function that causes the parser to
give an error message when the student types a decimal number.  This
means the student must enter fractions as fractions, or values like
sqrt(2) or pi/4 symbolically not numerically.

Revision 2649 - Directory Listing
Modified Thu Aug 19 14:19:32 2004 UTC (15 years, 3 months ago) by dpvc
Fixed an error in the generation of regexp patterns for the various
data types.

Revision 2648 - Directory Listing
Modified Thu Aug 19 12:38:47 2004 UTC (15 years, 3 months ago) by dpvc
The answer checkers now work with subclasses of Formulas that are not
part of the Value:: package tree itself (we call Value::isFormula()
rather than checking the class directly).

I also removed the various cmp_* flags that stored method names as
they ended up not needing to be used (they were intended as a means of
overriding the default method names, but subclassing turned out to be
a better approach).

I moved some initialization of the answer checker out of the anonymous
subroutine that is installed in the checker and just have that
subroutine call the correct answer's main checker (which I renamed).

Finally, I changed the student_ans value to be an HTMLized version of
the student answer, since the student could include things like < in
his answer (e.g., for vectors), in which case his whole answer might
disappear.  I wonder if this couldn't be handled better at a higher
level, as it seems wrong to make the student_ans be HTML rather than
the parsed string.  I originally thought Problem.pm could do the
protecting of HTML special characters, but this won't work without
additional changes, since some answer checkers put HTML into
student_ans to mark sytanx errors in the student answer, and you DON'T
want to protect those HTML characters.  The student_ans field is
probably being misused in this, and there might want to be another
field that gets used by Problem.pm in place of student_ans (which can
be HTML protected) when it is non-empty; say student_HTML or something
like that.  The answer checkers could use that field if it wants to
add HTML to the student answer, and student_ans otherwise, with the
assurance that it's HTML characters will be protected.  That way, if a
second answer checker calls the first (like some list checkers do),
then the second checker doesn't have to worry about removing HTML from
the student ans, and doesn't ahve to wonder whether the student_ans
actually contains an error message or syntax markings rather than the
actual student answer.

Revision 2647 - Directory Listing
Modified Thu Aug 19 12:18:56 2004 UTC (15 years, 3 months ago) by dpvc
Context() now accepts a reference to an actual Context object rather
than a name of a predefined context, and will switch to that.

Revision 2646 - Directory Listing
Modified Thu Aug 19 12:16:41 2004 UTC (15 years, 3 months ago) by dpvc
Make it possible to create subclasses of objects in the value package
that are not actually in the Value:: package tree.  This makes it
possible to have .pl files (that are run via loadMacros) that create
new Value object classes that are local to the problem rather than
global to the system.  (With mod_perl, if a .pl file added to the
Value:: tree itself, the results would be persistent, and this could
adversely affect future problems processed by the same httpd child
process.  It could lead to "redefined subroutine" errors, or worse.)
This provides a safe way to extend the parser on a problem-specific
basis.

This technique is used in the line and plane answer checkers (coming
soon), for example.  If such a checker becomes widely used, it can
always be added into the Value:: tree at a later time.

Revision 2645 - Directory Listing
Modified Thu Aug 19 12:02:15 2004 UTC (15 years, 3 months ago) by dpvc
Make sure equality always returns a defined value, and
put spaces around the equal sign in string output.

Revision 2643 - Directory Listing
Modified Thu Aug 19 11:55:56 2004 UTC (15 years, 3 months ago) by dpvc
Use the standard precedences rather than the experimental ones by
default.  The professor will need to specificaly request the
non-standard ones, for now.

Revision 2634 - Directory Listing
Modified Tue Aug 17 15:21:58 2004 UTC (15 years, 3 months ago) by dpvc
Changed the string used for the student answer to be taken from the
unevaluated formula rather than the fully-evaluated one.  This leaves
constants unreplaced, for one thing.

Currently the parser combines constants automatically during the parse
[which should be controllable by a flag], so student answers that
produce numbers are fully evaluated at this point already, except for
constant substitution.  This could be changed so that even for
numberic results, the student sees the parsed expression (rather than
the numeric result), which might help them identify where they and the
parser differ in their interpretation.  It is still nice to see the
final computed result, however, but there is no place to show the
parsed input as well as the final result.  One solution would be to
add another column (wasting space).  Another would be to make the
value shown be "parsed-value = computed-value" when they are not the
same thing.  A bit ugly, but works within the current framework.

Revision 2632 - Directory Listing
Modified Tue Aug 17 12:05:18 2004 UTC (15 years, 3 months ago) by dpvc
Fixed typo in name of random generator.

Revision 2629 - Directory Listing
Modified Tue Aug 17 02:01:27 2004 UTC (15 years, 3 months ago) by dpvc
Fixed a number of minor problems with creating perl functions from
formulas (this is done automatically as part of the function answer
checker, so is showing up now that I have that checker in place).

Also improved error messages in the function answer checker, and fixed
a bug when students enter a constant list or union when the answer
checker expects formulas.

Revision 2628 - Directory Listing
Modified Mon Aug 16 21:41:05 2004 UTC (15 years, 3 months ago) by dpvc
Allow parser "constants" to be (in reality) formulas.  That way, for
example, you can defined T, N and B to be the formulas for the unit
tangent, normal and binormal of a space curve (as functions of "t")
and the student can write anwers in terms of T, N and B (without
having to compute them).

You could have created FUNCTIONS T(t), N(t) and B(t), and added them
to the parser to get almost the same effect, but the students would
have had to include the "(t)".  (If you want that, go ahead and do it
that way.)

Revision 2627 - Directory Listing
Modified Mon Aug 16 20:22:16 2004 UTC (15 years, 3 months ago) by dpvc
Removed unwanted side-effects of some type-match checks, and moved the
ignoreStrings flag so that it is available for the checkers of ANY type.

Revision 2626 - Directory Listing
Modified Mon Aug 16 19:44:26 2004 UTC (15 years, 3 months ago) by dpvc
One more fix for handling intervals properly (I think it's really
right this time).  Also, named constants that end in numbers will
produce TeX output with the number as a subscript (this was already
true for variable names).

Revision 2625 - Directory Listing
Modified Mon Aug 16 18:35:12 2004 UTC (15 years, 3 months ago) by dpvc
Added string comparison to all Value object classes (to compare the
string value of an object to another string).

Overloaded perl '.' operator to do dot product when the operands are
formulas returning vectors.  (Part of the auto-generation of
formulas).

A few improvements to real and complex class output results.

Made Union class slightly more robust and removed need for makeUnion
method other than in the Union itself.

Revision 2624 - Directory Listing
Modified Mon Aug 16 13:44:45 2004 UTC (15 years, 3 months ago) by dpvc
Added support for unorderd list or formulas with partial credit.
Fixed type mismatch reporting in formula answer checker.
Fixed an error with Unions producing incorrect perl versions under
some circumstances.

Revision 2622 - Directory Listing
Modified Sun Aug 15 22:46:57 2004 UTC (15 years, 3 months ago) by dpvc
Created the first draft of the Parser's function answer checker.  Some
work still needs to be done, in particular, type mismatches are not
being reported, and lists are being processed only as ordered lists
with no partial credit.

This doesn't implement everything from fun_cmp.  In particular, there
is no support for parameter matching at the moment.  This will have to
be added, but I'm not quite sure how to do it when the function's
return value is not a real number (e.g., an interval).

On the other hand, this checker is more forgiving about domain errors:
if tries a point where the professor's function is not defined, it
ignores that one and looks for another (until it decides it can't find
one).  Once it has these points, it tries them on the student's
answer, and if the student's function is undefined, then the student
answer is wrong (since it is not defined somewhere that the
professor's funciton is).  This avoids the "Error evaluating student
function at ..." messages, which just confused most students anyway.

Revision 2621 - Directory Listing
Modified Sun Aug 15 17:05:41 2004 UTC (15 years, 3 months ago) by dpvc
Improved error messages, particularly when the student enters a
formula in an answer that should be constant, and also for incorrect
answers in lists of answers.  There are a few other miscellaneous output
improvements as well.

Revision 2620 - Directory Listing
Modified Sun Aug 15 12:02:05 2004 UTC (15 years, 3 months ago) by dpvc
Had to put back the global context variable after all.  :-(
It gets reset in Parser.pl, so it should be OK even with mod_perl.

Revision 2619 - Directory Listing
Modified Sun Aug 15 00:45:46 2004 UTC (15 years, 4 months ago) by dpvc
Modified Context() function so that it no longer uses a global package
variable for storing the user's context table.

Revision 2617 - Directory Listing
Modified Sun Aug 15 00:13:38 2004 UTC (15 years, 4 months ago) by dpvc
The Union answer checker now uses the generic List checker, so that it
will be able to produce partial credit and hints about which Intervals
are correct.

Revision 2616 - Directory Listing
Modified Sat Aug 14 21:29:21 2004 UTC (15 years, 4 months ago) by dpvc
Added an equality operator (not active initially) that can be used for
things like equations of planes and so on.  I'm working on the answer
checker for that.

Revision 2615 - Directory Listing
Modified Sat Aug 14 21:27:45 2004 UTC (15 years, 4 months ago) by dpvc
*** empty log message ***

Revision 2612 - Directory Listing
Modified Sat Aug 14 19:29:42 2004 UTC (15 years, 4 months ago) by dpvc
Fixed some bugs in the handle of the context in ->string and ->TeX
methods of Value objects.

Revision 2611 - Directory Listing
Modified Sat Aug 14 15:59:35 2004 UTC (15 years, 4 months ago) by dpvc
Fixed a typo in one of the parser answer checkers.  Added a line that
was incorrecctly removed in the parser.

Revision 2610 - Directory Listing
Modified Sat Aug 14 13:55:54 2004 UTC (15 years, 4 months ago) by dpvc
The class file for the Value::String object.  (Forgot to add it before
the last commit.  Sorry!)

Revision 2609 - Directory Listing
Modified Sat Aug 14 13:54:52 2004 UTC (15 years, 4 months ago) by dpvc
Added a String type to the Value package.  Mostly this is to make it
possible to generate an answer checker for it that uses the parser.
It also makes it more consistent for handling things like stringify,
especially when they are recursively called internally.

Added new default strings "NONE" and "DNE", since these get used a
lot.

Modified how the default parameters are set up for the answer
checkers, and how the answer checker reports the expected answer type
in type mismatch error messages.

Revision 2607 - Directory Listing
Modified Sat Aug 14 11:26:49 2004 UTC (15 years, 4 months ago) by dpvc
Allow unary + and - to work on infinities.

Revision 2606 - Directory Listing
Modified Sat Aug 14 11:25:47 2004 UTC (15 years, 4 months ago) by dpvc
Can now specify that the objects stringify themselfs in their TeX
forms rather than their answer-string forms.  This makes it easier to
use the objects in the text of a problem (without having to call ->TeX
explicitly each reference).

Use

       Context()->texStrings

to start outputting TeX strings, and

      Context()->normalStrings

to switch back.

Revision 2605 - Directory Listing
Modified Sat Aug 14 02:50:18 2004 UTC (15 years, 4 months ago) by dpvc
Incorporated infinities into Parser package better.  They have been
stored as String objects (with extra data) in the parser, and I've
left it that way, but now they convert to/from Vallue::Infinity
objects correctly, and these are used for generating the output.

Also added the Infinity answer checker, and adjusted the error
messages produces by type mismatches in the answer checkers and
elsewhere.

Revision 2604 - Directory Listing
Modified Fri Aug 13 23:49:16 2004 UTC (15 years, 4 months ago) by dpvc
Fixed some output issues with intervals and unions.

Revision 2603 - Directory Listing
Modified Fri Aug 13 23:01:07 2004 UTC (15 years, 4 months ago) by dpvc
Added an Infinite object class for the Value package.  Still need to
add it to the Parser package.

Revision 2601 - Directory Listing
Modified Fri Aug 13 19:06:09 2004 UTC (15 years, 4 months ago) by dpvc
Added ability to report incorrect coordinates in point and vector
answers, and incorrect endpoints and endpoint types in intervals.
Separated these kinds of checks from the typeMatch check, where they
didn't really belong.

Added ability to specify intervals and unions as strings in Interval()
and Union(), which makes it easier to make constants of these types.

There are still problems comparing intervals that contain infinities;
I really need to make the infinity object to solve this, so have put
off trying to fix that for now.

Revision 2600 - Directory Listing
Modified Fri Aug 13 14:39:16 2004 UTC (15 years, 4 months ago) by dpvc
Handle list entries that are not Value objects better.

Revision 2599 - Directory Listing
Modified Fri Aug 13 14:19:23 2004 UTC (15 years, 4 months ago) by dpvc
The List object's answer checker is now considerably improved.  It
will allow you to specify an unorderd or ordered check, and whether to
print various kinds of hints for wrong answers.

The checker can return partial credit, but WW doesn't deal well with
this at the moment (some small changes to Problem.pm can take care of
that).  Partial credit should be based on $showPartialCorrectAnswers,
but it is disabled for now.

The list answer checker probably still needs some work, especially
with non-numeric lists.

Revision 2597 - Directory Listing
Modified Fri Aug 13 11:38:22 2004 UTC (15 years, 4 months ago) by dpvc
Added answer checker for parallel vectors.
Added option to number checker to have it not report type mismatches
for the known strings (like 'infinity').  (Really need a class for
infinities, and a Value.pm class for strings.)

Revision 2596 - Directory Listing
Modified Thu Aug 12 23:11:32 2004 UTC (15 years, 4 months ago) by dpvc
Have parser handle infinities better.

Revision 2594 - Directory Listing
Modified Thu Aug 12 20:17:18 2004 UTC (15 years, 4 months ago) by dpvc
Fixes for handling intervals better.  In particular, deal better with
ambiguous situations, like (1,2) that could be a point.

You can use [a,a] to specify the single point a.  I'd like to make {a}
represent this (and maybe even {a,b,c} to form finite sets), but this
would interfere with the use of { and } as alternative parentheses.
(Does anyone really use these?)

Do we need a cross product for intervals (and sets) as a means of
representing regions in R^2 (or higher)?

Revision 2593 - Directory Listing
Modified Thu Aug 12 16:48:52 2004 UTC (15 years, 4 months ago) by dpvc
This is a preliminary attempt at adding answer checkers that use the
parser.  If you have a parser object (like a formula or a vector), you
can use the ->cmp method to get an answer checker appropriate for the
object.  For example:

	 Context('Vector');
	 $v = Vector(1,2,3);
	 #  print text of problem
	 ANS($v->cmp);

would produce an answer checker that matched against the vector <1,2,3>.
Most of the parameters are set in the Context, but additional ones can
be passed to the checker (this still needs work).

See the sample problems for more examples.

The checkers for Reals, Complexes, Points, Vectors, Matrices and
Intervals work pretty well.  The ones for List and Union objects need
more work, as they only do an ORDERED check at the moment (the student
answers must be in the same order).  This needs to be fixed.
The checker for Formula objects (which corresponds to fun_cmp) still
needs to be written.

Revision 2592 - Directory Listing
Modified Thu Aug 12 16:40:47 2004 UTC (15 years, 4 months ago) by dpvc
A number of small fixes.  Most were to fix minor bugs in string and
TeX output, particulary for the various list-based objects (like
vectors, intervals, etc.).  There were also some bug fixes in the
comparison routines.  Some additional checks were added for valid
intervals when the coordinates are formulas.

Revision 2583 - Directory Listing
Modified Tue Aug 10 11:22:19 2004 UTC (15 years, 4 months ago) by dpvc
Fixed generation of LaTeX version of sqrt(...).

Revision 2580 - Directory Listing
Modified Mon Aug 9 21:38:58 2004 UTC (15 years, 4 months ago) by dpvc
Forgot to add this file.  It implements the "fuzzy real" class.

Revision 2579 - Directory Listing
Modified Mon Aug 9 21:38:01 2004 UTC (15 years, 4 months ago) by dpvc
Significant update to new parser.

New features include:

  Better control over format of vector output (you can now
    specify ijk-format rather than <...> format)

  "Fuzzy" reals, where the relations like == return true when the
    two values are "close enough".  (This is controlable using
    parameters similar to those used in NUM_CMP).

  The fuzzy reals are now used in vectors/points/matrices/complexes/intervals
    and so on so that their relations will also be fuzzy.  E.g.,
    (1E-13,2) == (0,3) will be true, and norm(Vector(0,1E-13)) will
    equal 0.

  The two main portions of the parser (the Parser and Value packages)
    now share a common context object for configuration purposes.

Revision 2576 - Directory Listing
Modified Wed Aug 4 20:52:28 2004 UTC (15 years, 4 months ago) by dpvc
Make Parser work with PGauxiliaryFunctions.pl, and add the macro files
needed to initialize the parser.

Revision 2558 - Directory Listing
Modified Wed Jul 28 20:32:33 2004 UTC (15 years, 4 months ago) by sh002i
merged changes from rel-2-1-a1 -- stop using that branch.

Revision 2469 - Directory Listing
Modified Thu Jul 8 15:29:45 2004 UTC (15 years, 5 months ago) by apizer
Create equations directory if it doesn't exist.  All directories under
tmp should be recreated if they don't exist.

Arnie

Revision 2461 - Directory Listing
Modified Wed Jul 7 21:26:52 2004 UTC (15 years, 5 months ago) by apizer
Change permission of tmp files so that they can be removed.

Arnie

Revision 2420 - Directory Listing
Modified Sat Jun 26 21:56:44 2004 UTC (15 years, 5 months ago) by jj
Most of the work for adjusting vertical alignment of images is here.

Revision 2409 - Directory Listing
Modified Fri Jun 25 16:27:55 2004 UTC (15 years, 5 months ago) by jj
Allow option of not using the cache.  If its path is the empty string, then
we just return the md5 hash of the latex string followed by a 1.

Revision 2389 - Directory Listing
Modified Thu Jun 24 18:13:33 2004 UTC (15 years, 5 months ago) by dpvc
Removed extra spaces from around dvipng images.

(These can cause bad line breaks, e.g. between mathematics and the
punctuation that follows.)

Revision 2369 - Directory Listing
Modified Wed Jun 23 01:18:58 2004 UTC (15 years, 5 months ago) by sh002i
ImageGenerator is now using WeBWorK::Constants

Revision 2363 - Directory Listing
Modified Tue Jun 22 18:03:07 2004 UTC (15 years, 5 months ago) by jj
When using the imageCache (which is always), put images into subdirectories
based on the first two characters of their md5 hash.

Revision 2345 - Directory Listing
Modified Thu Jun 17 20:02:12 2004 UTC (15 years, 5 months ago) by apizer
Changed pacckage name from strict to ww_strict per Sam's suggestion
to prevent redefining warnings.

Arnie

Revision 2274 - Directory Listing
Modified Mon Jun 7 23:53:45 2004 UTC (15 years, 6 months ago) by sh002i
got rid of remaining calls to "wwerror". Fixes bug #530.

Revision 2167 - Directory Listing
Modified Sat May 22 22:32:43 2004 UTC (15 years, 6 months ago) by gage
Moved be_strict after package main;

Revision 2164 - Directory Listing
Modified Sat May 22 22:10:30 2004 UTC (15 years, 6 months ago) by gage
Moving ww_strict.pm forward to 5.8.3 compatible version
with require Carp; commented out

Revision 2163 - Directory Listing
Modified Sat May 22 21:34:58 2004 UTC (15 years, 6 months ago) by gage
Moved ww_strict.pm back to be identical with strict.pm from perl 5.6

Revision 2158 - Directory Listing
Modified Sat May 22 20:48:51 2004 UTC (15 years, 6 months ago) by gage
We are now using ww_strict.pm instead of strict.pm in be_strict;

Revision 2157 - Directory Listing
Modified Sat May 22 20:46:20 2004 UTC (15 years, 6 months ago) by gage
We are using our own version of strict.pm that has a require Carp;  commented out.
This is included in be_strict which is used to implement strict within PG macro files
which need to be evaluted inside the Safe compartment

Revision 2142 - Directory Listing
Modified Fri May 21 23:54:00 2004 UTC (15 years, 6 months ago) by apizer
Replaced PGsort with a version that uses quick sort.  This fixes the
problem the old PGsort had with Perl compiled with ithreads.

Arnie

Revision 2135 - Directory Listing
Modified Fri May 21 01:34:28 2004 UTC (15 years, 6 months ago) by sh002i
Modified DVIPNG_ARGS to work with dvipng >= 1.0.

Revision 2060 - Directory Listing
Modified Sun May 9 17:43:32 2004 UTC (15 years, 7 months ago) by gage
Cosmetic fixes to code layout.

Revision 2057 - Directory Listing
Modified Sat May 8 22:53:03 2004 UTC (15 years, 7 months ago) by gage
Preliminary changes that may eventually allow us to solve the be_strict problem for 5.8.0

Revision 1779 - Directory Listing
Modified Fri Feb 6 02:52:42 2004 UTC (15 years, 10 months ago) by gage
Allow a 256 error from dvipng.  This seems to be necessary on webwork.math.rochester.edu, so I'm commiting
it to the CVS as well to keep the two systems in sync.

--Mike

Revision 1759 - Directory Listing
Modified Mon Jan 26 16:59:30 2004 UTC (15 years, 10 months ago) by gage
Minor change to the definition of the timer

Revision 1688 - Directory Listing
Modified Sat Dec 27 21:34:04 2003 UTC (15 years, 11 months ago) by gage
Added error messages that should make it easier to tell if
certain directories have not been created. Also checks that
files are actually created and written at each step of the process.
--Mike

Revision 1556 - Directory Listing
Modified Wed Oct 1 02:40:09 2003 UTC (16 years, 2 months ago) by sh002i
changed the way the IO modules work: shared subroutines are in IO now,
and IO has a hash %WeBWorK::PG::IO::SHARE which can be added to
Translator's %shared_subroutine_hash directly.

Revision 1555 - Directory Listing
Modified Wed Oct 1 02:31:54 2003 UTC (16 years, 2 months ago) by sh002i
changed documentation to reflect the fact that reh refresh and mtime
flags are no longer used

Revision 1553 - Directory Listing
Modified Tue Sep 30 01:20:55 2003 UTC (16 years, 2 months ago) by sh002i
added files from WW2

Revision 1540 - Directory Listing
Modified Sat Sep 27 16:47:34 2003 UTC (16 years, 2 months ago) by gage
When displaying a raw student answer, nulls are converted to \0 so that they
can be seen.  This is probably redundant since strings with multiple values
separated by nulls are supposed to be converted to references to arrays before
they reach this point.
--Mike

Revision 1535 - Directory Listing
Modified Fri Sep 26 21:16:18 2003 UTC (16 years, 2 months ago) by gage
Added line which prints out the raw student answer when the debug
flag is on.
--Mike

Revision 1524 - Directory Listing
Modified Thu Sep 25 00:28:15 2003 UTC (16 years, 2 months ago) by sh002i
added image generation modules from WW2

Revision 1454 - Directory Listing
Modified Tue Aug 12 16:43:36 2003 UTC (16 years, 4 months ago) by jj
Redoing fix to random so that random(2,7,3) won't produce 8.  The original
fix was lost in the merger with mod-perl version.

Revision 1333 - Directory Listing
Modified Wed Jul 9 23:20:23 2003 UTC (16 years, 5 months ago) by jj
Fixed new bug introduced by, er, my previous bug fix.

Revision 1310 - Directory Listing
Modified Tue Jul 1 15:35:51 2003 UTC (16 years, 5 months ago) by gage
Changed the defintion of *i to be inside the Complex package.
this and the change to dangerousMacros seems to have cured bug #116
--Mike

Revision 1303 - Directory Listing
Modified Mon Jun 30 20:36:57 2003 UTC (16 years, 5 months ago) by apizer
added missing hyperbolic, inverse trig, and inverse hyperbolic functions
cintributed by Davide Cervone

Arnie

Revision 1290 - Directory Listing
Modified Thu Jun 26 22:43:15 2003 UTC (16 years, 5 months ago) by gage
Merge the time optimized branch and the main branch.  I forgot one subroutine
--Mike

Revision 1285 - Directory Listing
Modified Thu Jun 26 21:04:09 2003 UTC (16 years, 5 months ago) by gage
Adding preliminary ability to decompose non-square matrices.  Won't work
if a permutation is required (i.e. a pivot)
--Mike

Revision 1280 - Directory Listing
Modified Thu Jun 26 17:42:18 2003 UTC (16 years, 5 months ago) by malsyned
Merged the changes needed to work with the new WW2 translator
optimizations into the main pg branch.

Revision 1117 - Directory Listing
Modified Wed Jun 11 04:00:37 2003 UTC (16 years, 6 months ago) by gage
Added a feature to correspond to a change made in process_answers in Translator.pm.

 Each answer
evaluator is given the
answer AND the answer label (e.g. AnSWer1) of the answer.  The label
is placed in the answer hash at $hash{ans_label} for use by filters
that need to know the label of the answer they are evaluating.

--Mike

Revision 1094 - Directory Listing
Modified Mon Jun 9 22:46:25 2003 UTC (16 years, 6 months ago) by jj
Fixed bug when the function is sampled at a point where it is not defined.

Revision 1079 - Directory Listing
Modified Mon Jun 9 17:36:12 2003 UTC (16 years, 6 months ago) by apizer
removed unneccesary shebang lines

Revision 1073 - Directory Listing
Modified Mon Jun 9 13:30:46 2003 UTC (16 years, 6 months ago) by gage
This module contains IO used in saving an answer to a file.
--Mike

Revision 1070 - Directory Listing
Modified Mon Jun 9 02:02:20 2003 UTC (16 years, 6 months ago) by gage
Bringing this version of Matrix.pm up to date with the latest in
courseScripts.
--Mike

Revision 1050 - Directory Listing
Added Fri Jun 6 21:39:42 2003 UTC (16 years, 6 months ago) by sh002i
moved PG modules and macro files from webwork-modperl to pg
-sam

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