Status: Accepted
Owner: ----
Labels: Type-Defect Priority-Medium CodeInCategory-Research
CodeInDifficulty-Medium
New issue 2803 by asmeu...@gmail.com: Investigate how to make the rewrite
framework more flexible
http://code.google.com/p/sympy/issues/detail?id=2803
Currently, the rewrite framework only allows expr.rewrite(function) (e.g.,
cos(x).rewrite(exp)), and it implements only one rule per function pair.
This should be made more general. Sometimes, you can't express a rewrite
rule with just a function. Other times, there is more than one way to
rewrite one function in terms of another (for example cos(x) == sqrt(1 -
sin(x)) == sin(pi/2 - x)).
The issue is to consider ways to make the rewrite framework stronger, but
still modular like it is now (so it's easily extensible).
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