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Context() now accepts a reference to an actual Context object rather than a name of a predefined context, and will switch to that.

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Make sure equality always returns a defined value, and put spaces around the equal sign in string output.

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Use the standard precedences rather than the experimental ones by default. The professor will need to specificaly request the non-standard ones, for now.

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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.

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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.)

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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).

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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.

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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.

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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.

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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.

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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.

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Modified Context() function so that it no longer uses a global package variable for storing the user's context table.

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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.

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*** empty log message ***

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Fixed some bugs in the handle of the context in ->string and ->TeX methods of Value objects.

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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.

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Allow unary + and - to work on infinities.

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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.

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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.)

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Have parser handle infinities better.

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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)?

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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.

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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.

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Make Parser work with PGauxiliaryFunctions.pl, and add the macro files needed to initialize the parser.

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merged changes from rel-2-1-a1 -- stop using that branch.

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