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# Log of /trunk/pg/lib/Parser

 Sticky Revision:

Revision 5992 - Directory Listing
Modified Thu Feb 5 15:01:44 2009 UTC (11 years ago) by dpvc
Removed unused variable


Revision 5977 - Directory Listing
Modified Tue Jan 20 18:54:56 2009 UTC (11 years ago) by dpvc
Fixed incorrect parentheses being added when $showparens eq "same"  Revision 5949 - Directory Listing Modified Tue Dec 30 00:41:40 2008 UTC (11 years, 1 month ago) by dpvc Fixed the name stored in the StrictFraction context (removed the trailling s).  Revision 5697 - Directory Listing Modified Sat Jun 14 22:51:04 2008 UTC (11 years, 8 months ago) by dpvc Fix typo in changes for "no strict refs".  Revision 5696 - Directory Listing Modified Sat Jun 14 12:14:21 2008 UTC (11 years, 8 months ago) by dpvc Added no strict "refs" to try to avoid new error checking in Perl 5.10.  Revision 5695 - Directory Listing Modified Sat Jun 14 11:56:02 2008 UTC (11 years, 8 months ago) by dpvc Fix typo in comments  Revision 5607 - Directory Listing Modified Thu Jan 31 14:26:45 2008 UTC (12 years ago) by dpvc Fixed differentiation of log() function (it used to give an error about undefined function D_ln).  Revision 5581 - Directory Listing Modified Tue Nov 6 16:23:33 2007 UTC (12 years, 3 months 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 5520 - Directory Listing Modified Mon Sep 24 22:33:16 2007 UTC (12 years, 4 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 5511 - Directory Listing Modified Sat Sep 15 14:45:22 2007 UTC (12 years, 5 months ago) by dpvc Cosmetic changes.  Revision 5510 - Directory Listing Modified Sat Sep 15 14:44:03 2007 UTC (12 years, 5 months ago) by dpvc Reduce -0 to 0.  Revision 5509 - Directory Listing Modified Sat Sep 15 00:56:51 2007 UTC (12 years, 5 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, 5 months ago) by dpvc A couple of syntax issues.  Revision 5472 - Directory Listing Modified Sat Sep 8 22:24:06 2007 UTC (12 years, 5 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, 5 months ago) by dpvc Make copies of the components rather than just copying the pointers.  Revision 5464 - Directory Listing Modified Fri Sep 7 14:18:30 2007 UTC (12 years, 5 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 5439 - Directory Listing Modified Tue Aug 28 21:53:42 2007 UTC (12 years, 5 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 5432 - Directory Listing Modified Sun Aug 26 18:53:23 2007 UTC (12 years, 5 months ago) by dpvc Only try to form intervals from lists that could be intervals when they are of length 2.  Revision 5408 - Directory Listing Modified Fri Aug 24 03:02:54 2007 UTC (12 years, 5 months ago) by dpvc Load the UNIVERSAL package and make it available to Parser Items and Contexts.  Revision 5387 - Directory Listing Modified Sun Aug 19 21:31:17 2007 UTC (12 years, 6 months ago) by dpvc Always make units be in \textstyle (in particular, in the preview display).  Revision 5377 - Directory Listing Modified Sun Aug 19 14:41:26 2007 UTC (12 years, 6 months ago) by dpvc Make sure clear doesn't remove the special 'start' paren that is required by the Parser class.  Revision 5375 - Directory Listing Modified Sun Aug 19 03:39:10 2007 UTC (12 years, 6 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, 6 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, 6 months ago) by dpvc Include extra parens when they have been requested.  Revision 5331 - Directory Listing Modified Wed Aug 15 04:10:41 2007 UTC (12 years, 6 months ago) by dpvc Added a reduce flag for x^1 processing (it was not able to be disabled before).  Revision 5323 - Directory Listing Modified Tue Aug 14 15:57:19 2007 UTC (12 years, 6 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 5252 - Directory Listing Modified Thu Aug 9 06:01:48 2007 UTC (12 years, 6 months ago) by dpvc Make sure ^ is quoted in character patterns so it doesn't become a negatted character pattern.  Revision 5238 - Directory Listing Modified Tue Aug 7 04:30:59 2007 UTC (12 years, 6 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, 6 months ago) by dpvc Allow Context()->variables-add(name=>[type,options]) format for declaring a variable.  Revision 5132 - Directory Listing Modified Mon Jul 9 19:54:21 2007 UTC (12 years, 7 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, 7 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, 7 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 5124 - Directory Listing Modified Wed Jul 4 20:13:03 2007 UTC (12 years, 7 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, 7 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, 7 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, 7 months ago) by dpvc Cosmetic change.  Revision 5120 - Directory Listing Modified Wed Jul 4 17:00:18 2007 UTC (12 years, 7 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, 7 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, 7 months ago) by dpvc Make string() method use the separator specified in the List definition rather than a hard coded comma.  Revision 5116 - Directory Listing Modified Tue Jul 3 10:44:30 2007 UTC (12 years, 7 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 5114 - Directory Listing Modified Mon Jul 2 23:21:06 2007 UTC (12 years, 7 months ago) by dpvc Fixed error in derivative of quotients introduced by recent bad editing.  Revision 5107 - Directory Listing Modified Sun Jul 1 18:25:24 2007 UTC (12 years, 7 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 5105 - Directory Listing Modified Sun Jul 1 11:18:39 2007 UTC (12 years, 7 months ago) by dpvc Do a better version of promote (get the context right) for these function calls.  Revision 5082 - Directory Listing Modified Fri Jun 29 19:08:04 2007 UTC (12 years, 7 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 5067 - Directory Listing
Modified Thu Jun 28 22:33:31 2007 UTC (12 years, 7 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, 7 months ago) by dpvc
Use Value->context rather than Value::context.


Revision 5026 - Directory Listing
Modified Sat Jun 23 20:08:07 2007 UTC (12 years, 7 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 5024 - Directory Listing
Modified Sat Jun 23 19:46:00 2007 UTC (12 years, 7 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, 7 months ago) by dpvc
Make context method work when called from package rather than blessed object.


Revision 5015 - Directory Listing
Modified Fri Jun 22 01:56:06 2007 UTC (12 years, 8 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, 8 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, 8 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, 8 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 5004 - Directory Listing Modified Fri Jun 15 03:17:31 2007 UTC (12 years, 8 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, 8 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, 8 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 4994 - Directory Listing Modified Sun Jun 10 01:17:29 2007 UTC (12 years, 8 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 4981 - Directory Listing Modified Thu Jun 7 12:35:02 2007 UTC (12 years, 8 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, 8 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, 8 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
$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 4975 - Directory Listing Modified Wed Jun 6 21:44:05 2007 UTC (12 years, 8 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 4928 - Directory Listing Modified Tue Apr 17 00:36:16 2007 UTC (12 years, 10 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, 10 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 4765 - Directory Listing Modified Sat Feb 3 15:23:05 2007 UTC (13 years ago) by gage Begin pod documentation.  Revision 4729 - Directory Listing Modified Sat Dec 16 14:10:12 2006 UTC (13 years, 2 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 4672 - Directory Listing Modified Mon Nov 27 04:20:40 2006 UTC (13 years, 2 months 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 4669 - Directory Listing Modified Mon Nov 27 00:00:46 2006 UTC (13 years, 2 months 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, 2 months 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 4583 - Directory Listing Modified Mon Oct 23 11:43:40 2006 UTC (13 years, 3 months 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, 3 months 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, 4 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, 4 months ago) by dpvc Fixed problem where a zero with units would me marked as "not looking like anumber with units".  Revision 4511 - Directory Listing Modified Wed Sep 20 23:38:38 2006 UTC (13 years, 5 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, 5 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, 5 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, 5 months ago) by dpvc Allow the _check subroutine to affect the {isConstant} field.  Revision 4454 - Directory Listing Modified Thu Sep 7 01:18:08 2006 UTC (13 years, 5 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 4300 - Directory Listing Modified Wed Jul 26 13:18:25 2006 UTC (13 years, 6 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, 6 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 4044 - Directory Listing Modified Thu Apr 6 00:23:59 2006 UTC (13 years, 10 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 4028 - Directory Listing Modified Sat Feb 18 22:42:55 2006 UTC (14 years 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 3915 - Directory Listing Modified Tue Jan 17 02:20:19 2006 UTC (14 years, 1 month 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 (14 years, 1 month 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 3866 - Directory Listing Modified Sat Dec 31 01:39:54 2005 UTC (14 years, 1 month 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, 2 months 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, 3 months 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, 3 months 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 3714 - Directory Listing Modified Sun Oct 16 02:44:34 2005 UTC (14 years, 4 months 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 3703 - Directory Listing Modified Mon Oct 10 23:47:26 2005 UTC (14 years, 4 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, 4 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 3652 - Directory Listing Modified Sat Sep 24 00:47:30 2005 UTC (14 years, 4 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, 5 months ago) by dpvc Prevent the empty list from having open and close be set to 'start' (a value used internally).  Revision 3603 - Directory Listing Modified Wed Sep 7 01:10:58 2005 UTC (14 years, 5 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 3591 - Directory Listing
Modified Tue Aug 30 12:21:36 2005 UTC (14 years, 5 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 3587 - Directory Listing
Modified Tue Aug 30 00:36:55 2005 UTC (14 years, 5 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, 5 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 3574 - Directory Listing
Modified Thu Aug 25 18:32:01 2005 UTC (14 years, 5 months ago) by jj
Updated instructions to match changes to global.conf.dist and the move


Revision 3573 - Directory Listing
Modified Thu Aug 25 18:24:55 2005 UTC (14 years, 5 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, 5 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, 5 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 3560 - Directory Listing
Modified Wed Aug 24 11:44:49 2005 UTC (14 years, 5 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, 6 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, 6 months ago) by dpvc
Fixed more undefined values


Revision 3529 - Directory Listing
Modified Mon Aug 15 01:50:21 2005 UTC (14 years, 6 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 3523 - Directory Listing
Modified Sat Aug 13 22:38:39 2005 UTC (14 years, 6 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 3516 - Directory Listing
Modified Sat Aug 13 20:59:28 2005 UTC (14 years, 6 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 3510 - Directory Listing
Modified Sat Aug 13 17:32:58 2005 UTC (14 years, 6 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 3500 - Directory Listing
Modified Sat Aug 13 01:39:14 2005 UTC (14 years, 6 months ago) by dpvc
Fixed typo in previous update.


Revision 3499 - Directory Listing
Modified Sat Aug 13 00:41:24 2005 UTC (14 years, 6 months ago) by dpvc
Added sets to the differentiation information (no derivatives allowed)


Revision 3497 - Directory Listing
Modified Sat Aug 13 00:25:27 2005 UTC (14 years, 6 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

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


Revision 3495 - Directory Listing
Modified Fri Aug 12 23:21:52 2005 UTC (14 years, 6 months ago) by dpvc
Fixed use of undefined value for $position in TeX and String methods.  Revision 3494 - Directory Listing Modified Fri Aug 12 23:02:11 2005 UTC (14 years, 6 months ago) by dpvc Made the 'R' constant in Interval context show up as a bold R in TeX mode.  Revision 3491 - Directory Listing Modified Fri Aug 12 22:54:38 2005 UTC (14 years, 6 months ago) by dpvc Mark function as constant if it is.  Revision 3483 - Directory Listing Modified Fri Aug 12 01:21:48 2005 UTC (14 years, 6 months ago) by dpvc Added redefine() function to complement undefine() for various Context() values. For example Context()->operators->undefine('+'); makes '+' undefined, but Context()->operators->redefine('+'); will put it back. You can specify a context from which to take the redefinition, and a name in that context, as in Context()->operators->redefine('U',from=>"Interval"); Context()->operators->redefine('u',from=>"Interval",using=>"U"); Context()->operators->redefine('U',from=>$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, 6 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, 6 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, 6 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, 6 months ago) by dpvc Changes needt for Set object, and fixed a bug with unions containing constant intervals with non-constant ones.  Revision 3466 - Directory Listing Modified Thu Aug 11 14:19:26 2005 UTC (14 years, 6 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, 6 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, 6 months ago) by dpvc Dereference aliases to aliases properly.  Revision 3458 - Directory Listing Modified Wed Aug 10 14:28:59 2005 UTC (14 years, 6 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, 6 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, 6 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 3443 - Directory Listing Modified Mon Aug 1 12:42:21 2005 UTC (14 years, 6 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 3441 - Directory Listing Modified Mon Aug 1 12:04:23 2005 UTC (14 years, 6 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, 6 months ago) by dpvc Folded in Mike's changes for status messages.  Revision 3384 - Directory Listing Modified Sat Jul 16 19:24:31 2005 UTC (14 years, 7 months ago) by jj Fixed typo related to useBaseTenLog.  Revision 3370 - Directory Listing Modified Tue Jul 12 22:29:53 2005 UTC (14 years, 7 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, 7 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, 7 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, 7 months ago) by jj Fixed typo in installation instructions.  Revision 3353 - Directory Listing Modified Tue Jul 5 01:43:30 2005 UTC (14 years, 7 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, 7 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, 7 months ago) by gage Modified formatting  Revision 3350 - Directory Listing Modified Tue Jul 5 00:08:54 2005 UTC (14 years, 7 months ago) by dpvc Main file that calls in the legacy modules.  Revision 3348 - Directory Listing Modified Mon Jul 4 20:18:40 2005 UTC (14 years, 7 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, 7 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 3344 - Directory Listing Modified Mon Jul 4 19:39:37 2005 UTC (14 years, 7 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, 7 months ago) by dpvc Handle TeX versions of variables whose names include underscores better.  Revision 3335 - Directory Listing Modified Mon Jul 4 03:28:09 2005 UTC (14 years, 7 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, 7 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 3332 - Directory Listing Modified Sun Jul 3 20:05:28 2005 UTC (14 years, 7 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 3274 - Directory Listing Modified Thu Jun 9 11:16:01 2005 UTC (14 years, 8 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 3267 - Directory Listing Modified Sun Jun 5 23:25:20 2005 UTC (14 years, 8 months ago) by dpvc Allow for vectors to be marked as Column Vectors.  Revision 3221 - Directory Listing Modified Mon May 2 00:58:00 2005 UTC (14 years, 9 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, 9 months ago) by dpvc Added derivative of |x| as x/|x|.  Revision 3210 - Directory Listing Modified Thu Mar 31 19:44:49 2005 UTC (14 years, 10 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 3204 - Directory Listing Modified Mon Mar 28 23:47:50 2005 UTC (14 years, 10 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, 10 months ago) by dpvc Handle extra parentheses better.  Revision 3202 - Directory Listing Modified Mon Mar 28 23:45:27 2005 UTC (14 years, 10 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, 11 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, 11 months ago) by dpvc Fixed a typo.  Revision 2938 - Directory Listing Modified Tue Oct 19 00:24:47 2004 UTC (15 years, 4 months ago) by dpvc Added reduction rules to remove redundent negatives. Override string and TeX methods that avoid redundent parentheses.  Revision 2915 - Directory Listing Modified Wed Oct 13 03:31:17 2004 UTC (15 years, 4 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, 4 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, 4 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, 4 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, 4 months ago) by dpvc In StandardPrecedence mode, make the precedence of function apply match that in use by that AlgParser.  Revision 2842 - Directory Listing Modified Wed Sep 29 15:47:30 2004 UTC (15 years, 4 months ago) by dpvc Allow string constants to include spaces.  Revision 2802 - Directory Listing Modified Sun Sep 19 14:43:32 2004 UTC (15 years, 5 months ago) by dpvc Eliminated unneeded parentheses in TeX output when unary minus and plus are used with fractions.  Revision 2800 - Directory Listing Modified Sun Sep 19 14:27:39 2004 UTC (15 years, 5 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 2797 - Directory Listing Modified Sun Sep 19 01:16:10 2004 UTC (15 years, 5 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, 5 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, 5 months ago) by dpvc Fixed typo in addParens method name.  Revision 2789 - Directory Listing Modified Thu Sep 16 22:24:32 2004 UTC (15 years, 5 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, 5 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 2771 - Directory Listing Modified Sat Sep 11 17:11:29 2004 UTC (15 years, 5 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, 5 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 2756 - Directory Listing Modified Fri Sep 10 14:48:35 2004 UTC (15 years, 5 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 2701 - Directory Listing Modified Sat Aug 28 15:53:09 2004 UTC (15 years, 5 months ago) by dpvc Only convert (f(x))^2 to f^2(x) for specified functions f (as marked in the Context).  Revision 2697 - Directory Listing Modified Sat Aug 28 12:43:57 2004 UTC (15 years, 5 months ago) by dpvc Two more minor TeX improvements.  Revision 2696 - Directory Listing Modified Sat Aug 28 12:34:56 2004 UTC (15 years, 5 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 2687 - Directory Listing Modified Fri Aug 27 00:28:27 2004 UTC (15 years, 5 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, 5 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 2681 - Directory Listing Modified Tue Aug 24 03:34:47 2004 UTC (15 years, 5 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, 5 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, 5 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, 5 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 2675 - Directory Listing Modified Mon Aug 23 04:59:05 2004 UTC (15 years, 5 months ago) by dpvc Get the type right when evaluating an AbsoluteValue and obtaining a Value object.  Revision 2672 - Directory Listing Modified Sun Aug 22 22:46:14 2004 UTC (15 years, 5 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, 5 months ago) by dpvc Fixed some inconsistencies between handing of matrices within the parser and Value packages. Added a predefined Matrix context.  Revision 2668 - Directory Listing Modified Sun Aug 22 02:55:38 2004 UTC (15 years, 6 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 2666 - Directory Listing Modified Sun Aug 22 00:56:32 2004 UTC (15 years, 6 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, 6 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, 6 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 2660 - Directory Listing Modified Fri Aug 20 15:52:32 2004 UTC (15 years, 6 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, 6 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 2655 - Directory Listing
Modified Fri Aug 20 02:11:50 2004 UTC (15 years, 6 months ago) by dpvc
Fixed typo.


Revision 2653 - Directory Listing
Modified Thu Aug 19 17:31:18 2004 UTC (15 years, 6 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, 6 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 2647 - Directory Listing
Modified Thu Aug 19 12:18:56 2004 UTC (15 years, 6 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 2645 - Directory Listing
Modified Thu Aug 19 12:02:15 2004 UTC (15 years, 6 months ago) by dpvc
Make sure equality always returns a defined value, and


Revision 2643 - Directory Listing
Modified Thu Aug 19 11:55:56 2004 UTC (15 years, 6 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 2629 - Directory Listing
Modified Tue Aug 17 02:01:27 2004 UTC (15 years, 6 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, 6 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 2626 - Directory Listing
Modified Mon Aug 16 19:44:26 2004 UTC (15 years, 6 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, 6 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, 6 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, 6 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, 6 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, 6 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, 6 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 2616 - Directory Listing
Modified Sat Aug 14 21:29:21 2004 UTC (15 years, 6 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, 6 months ago) by dpvc
*** empty log message ***


Revision 2612 - Directory Listing
Modified Sat Aug 14 19:29:42 2004 UTC (15 years, 6 months ago) by dpvc
Fixed some bugs in the handle of the context in ->string and ->TeX
methods of Value objects.


Revision 2609 - Directory Listing
Modified Sat Aug 14 13:54:52 2004 UTC (15 years, 6 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
in type mismatch error messages.


Revision 2607 - Directory Listing
Modified Sat Aug 14 11:26:49 2004 UTC (15 years, 6 months ago) by dpvc
Allow unary + and - to work on infinities.


Revision 2605 - Directory Listing
Modified Sat Aug 14 02:50:18 2004 UTC (15 years, 6 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.

messages produces by type mismatches in the answer checkers and
elsewhere.


Revision 2597 - Directory Listing
Modified Fri Aug 13 11:38:22 2004 UTC (15 years, 6 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, 6 months ago) by dpvc
Have parser handle infinities better.


Revision 2594 - Directory Listing
Modified Thu Aug 12 20:17:18 2004 UTC (15 years, 6 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 2592 - Directory Listing
Modified Thu Aug 12 16:40:47 2004 UTC (15 years, 6 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
intervals when the coordinates are formulas.


Revision 2579 - Directory Listing
Modified Mon Aug 9 21:38:01 2004 UTC (15 years, 6 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, 6 months ago) by dpvc
Make Parser work with PGauxiliaryFunctions.pl, and add the macro files
needed to initialize the parser.


Revision 2558 - Directory Listing
Added Wed Jul 28 20:32:33 2004 UTC (15 years, 6 months ago) by sh002i
merged changes from rel-2-1-a1 -- stop using that branch.


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