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# Log of /trunk/pg/lib/Parser

 Sticky Revision:

Revision 2668 - Directory Listing
Modified Sun Aug 22 02:55:38 2004 UTC (15 years, 5 months ago) by dpvc
```Fixed TeX output of Matrices to use \array rather than \matrix 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, 5 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(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, 5 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, 5 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, 5 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, 5 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, 5 months ago) by dpvc
```Fixed typo.
```

Revision 2653 - Directory Listing
Modified Thu Aug 19 17:31:18 2004 UTC (15 years, 5 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, 5 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, 5 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, 5 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, 5 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, 5 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, 5 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, 5 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, 5 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, 5 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, 5 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, 5 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, 5 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, 5 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, 5 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, 5 months ago) by dpvc
```*** empty log message ***
```

Revision 2612 - Directory Listing
Modified Sat Aug 14 19:29:42 2004 UTC (15 years, 5 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, 5 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, 5 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, 5 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, 5 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, 5 months ago) by dpvc
```Have parser handle infinities better.
```

Revision 2594 - Directory Listing
Modified Thu Aug 12 20:17:18 2004 UTC (15 years, 5 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, 5 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, 5 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, 5 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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