Updates:
Blockedon: 1520
Comment #36 on issue 1358 by fab...@fseoane.net: (e*f*e*f).subs(e*f,f*e+h)
fails if e*f is not commutative
http://code.google.com/p/sympy/issues/detail?id=1358
I think patch should be improved. As wflynny says, old method used to put
args into a
set thus loosing order (important in the non-commutative case). However, If
we do
subs sequentially I don't think there would be a need to separate
commutative and
non-commutative parts.
I have an algorithm in my head that should make the code much cleaner, but
before I
proceed I need to have a clear idea on how subs should work. For example,
is #33 a
bug or not ? Please see also issue 1520
wflynny, you can help me first with issue 1520 looking for example at what
other CAS
are doing in this case (Maple, Maxima, etc.) and giving your opinion. Then
we can
improve your patch.
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