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Revision 2915 - (view) (download) (as text) (annotate) - [select for diffs]
Modified Wed Oct 13 03:31:17 2004 UTC (15 years, 1 month ago) by dpvc
File length: 8926 byte(s)
Diff to previous 2796
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 2796 - (view) (download) (as text) (annotate) - [select for diffs]
Modified Sun Sep 19 01:15:03 2004 UTC (15 years, 2 months ago) by dpvc
File length: 8711 byte(s)
Diff to previous 2789
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 2789 - (view) (download) (as text) (annotate) - [select for diffs]
Modified Thu Sep 16 22:24:32 2004 UTC (15 years, 2 months ago) by dpvc
File length: 8728 byte(s)
Diff to previous 2768
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 2768 - (view) (download) (as text) (annotate) - [select for diffs]
Modified Fri Sep 10 23:55:31 2004 UTC (15 years, 3 months ago) by dpvc
File length: 8577 byte(s)
Diff to previous 2697
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 2697 - (view) (download) (as text) (annotate) - [select for diffs]
Modified Sat Aug 28 12:43:57 2004 UTC (15 years, 3 months ago) by dpvc
File length: 8576 byte(s)
Diff to previous 2696
Two more minor TeX improvements.

Revision 2696 - (view) (download) (as text) (annotate) - [select for diffs]
Modified Sat Aug 28 12:34:56 2004 UTC (15 years, 3 months ago) by dpvc
File length: 8574 byte(s)
Diff to previous 2680
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 2680 - (view) (download) (as text) (annotate) - [select for diffs]
Modified Tue Aug 24 03:33:30 2004 UTC (15 years, 3 months ago) by dpvc
File length: 8518 byte(s)
Diff to previous 2678
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 2678 - (view) (download) (as text) (annotate) - [select for diffs]
Modified Mon Aug 23 23:55:37 2004 UTC (15 years, 3 months ago) by dpvc
File length: 8492 byte(s)
Diff to previous 2558
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 2558 - (view) (download) (as text) (annotate) - [select for diffs]
Added Wed Jul 28 20:32:33 2004 UTC (15 years, 4 months ago) by sh002i
File length: 8345 byte(s)
merged changes from rel-2-1-a1 -- stop using that branch.

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