Log of /trunk/pg/lib/Value.pm
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Revision
2625 -
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Modified
Mon Aug 16 18:35:12 2004 UTC (15 years, 4 months ago) by
dpvc
File length: 13964 byte(s)
Diff to
previous 2624
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 -
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Modified
Mon Aug 16 13:44:45 2004 UTC (15 years, 4 months ago) by
dpvc
File length: 13673 byte(s)
Diff to
previous 2622
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 -
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Modified
Sun Aug 15 22:46:57 2004 UTC (15 years, 4 months ago) by
dpvc
File length: 13715 byte(s)
Diff to
previous 2621
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 -
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Modified
Sun Aug 15 17:05:41 2004 UTC (15 years, 4 months ago) by
dpvc
File length: 13639 byte(s)
Diff to
previous 2612
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
2609 -
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Modified
Sat Aug 14 13:54:52 2004 UTC (15 years, 4 months ago) by
dpvc
File length: 13331 byte(s)
Diff to
previous 2606
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
2606 -
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Modified
Sat Aug 14 11:25:47 2004 UTC (15 years, 4 months ago) by
dpvc
File length: 13100 byte(s)
Diff to
previous 2605
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 -
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Modified
Sat Aug 14 02:50:18 2004 UTC (15 years, 4 months ago) by
dpvc
File length: 12896 byte(s)
Diff to
previous 2604
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
2601 -
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Modified
Fri Aug 13 19:06:09 2004 UTC (15 years, 4 months ago) by
dpvc
File length: 12409 byte(s)
Diff to
previous 2596
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
2592 -
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Modified
Thu Aug 12 16:40:47 2004 UTC (15 years, 4 months ago) by
dpvc
File length: 12055 byte(s)
Diff to
previous 2579
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
2579 -
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Modified
Mon Aug 9 21:38:01 2004 UTC (15 years, 4 months ago) by
dpvc
File length: 11668 byte(s)
Diff to
previous 2576
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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