Log of /trunk/pg/lib/Parser/BOP/subtract.pm

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Revision 5001 - (view) (download) (as text) (annotate) - [select for diffs]
Modified Tue Jun 12 04:05:56 2007 UTC (5 years, 11 months ago) by dpvc
File length: 2235 byte(s)
Diff to previous 4996

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).

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Revision 4996 - (view) (download) (as text) (annotate) - [select for diffs]
Modified Sun Jun 10 11:34:27 2007 UTC (5 years, 11 months ago) by dpvc
File length: 2299 byte(s)
Diff to previous 4994

Allow promote() to accept a context as the first argument so that the
promoted object can be forced into the given context.

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Revision 4994 - (view) (download) (as text) (annotate) - [select for diffs]
Modified Sun Jun 10 01:17:29 2007 UTC (5 years, 11 months ago) by dpvc
File length: 2311 byte(s)
Diff to previous 3523

Update to handle the fact that the Value package now includes the
context with all MathObjects.  (This may still need some work.)

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Revision 3523 - (view) (download) (as text) (annotate) - [select for diffs]
Modified Sat Aug 13 22:38:39 2005 UTC (7 years, 9 months ago) by dpvc
File length: 2265 byte(s)
Diff to previous 3477

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.

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Revision 3477 - (view) (download) (as text) (annotate) - [select for diffs]
Modified Thu Aug 11 20:57:18 2005 UTC (7 years, 9 months ago) by dpvc
File length: 2307 byte(s)
Diff to previous 2796

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).

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Revision 2796 - (view) (download) (as text) (annotate) - [select for diffs]
Modified Sun Sep 19 01:15:03 2004 UTC (8 years, 8 months ago) by dpvc
File length: 1628 byte(s)
Diff to previous 2678

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.

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Revision 2678 - (view) (download) (as text) (annotate) - [select for diffs]
Modified Mon Aug 23 23:55:37 2004 UTC (8 years, 9 months ago) by dpvc
File length: 1371 byte(s)
Diff to previous 2615

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.

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Revision 2615 - (view) (download) (as text) (annotate) - [select for diffs]
Modified Sat Aug 14 21:27:45 2004 UTC (8 years, 9 months ago) by dpvc
File length: 1302 byte(s)
Diff to previous 2558

*** empty log message ***

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Revision 2558 - (view) (download) (as text) (annotate) - [select for diffs]
Added Wed Jul 28 20:32:33 2004 UTC (8 years, 9 months ago) by sh002i
File length: 1302 byte(s)

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