Updates:
Labels: NeedsReview smichr
Comment #1 on issue 1399 by [email protected]: make cse recognize negative
of a subexpression
http://code.google.com/p/sympy/issues/detail?id=1399
This is working. In testing `a/(x-y) + b/(y-x)` found that it started
working with
commit b3ac58cd057e155fa91fe241ee95f0368e700bf9
Author: Mateusz Paprocki <[email protected]>
Date: Wed Jun 15 01:37:44 2011 +0200
Made Add._eval_subs() more smart about minus signs
Now this is possible:
In [1]: ((-x - 1)*y).subs(x + 1, t)
Out[1]: -t⋅y
(previously returned expression unchanged).
I added this simple test to https://github.com/sympy/sympy/pull/875 . (The
OP expression also works.)
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