Comment #8 on issue 2110 by Vinzent.Steinberg: failing tests
http://code.google.com/p/sympy/issues/detail?id=2110
It triggers some bug in subs. If you revert a line introduced by
commit 4e5195d303eca6997c77b57144ee45829b70a2ba
Author: Bill Flynn <wfly...@gmail.com>
Date: Sat Aug 22 11:55:47 2009 -0700
Fixes Mul's substitution
Lots of tests written. Previously it was essentially broken, now it
works both
for commutative and noncommutative symbols
Signed-off-by: Ondrej Certik <ond...@certik.cz>
i.e. around line 932:
if myFlag == True:
expr = comms_final+noncomms_final
return Mul(coeff_self/coeff_old,
Mul(*expr)._eval_subs(old,new))#*[e._eval_subs(old,new) for e in expr])
to the commented line, it works, the test passes, but a test related to the
commutative substitution fails. (The bug was that comms_final was growing
very large with the same Wild(). Or dummy symbol? It was named _p.)
I did not yet try to understand the code and find a real fix. I
suspect "myFlag" is related. (We should really rename this one, btw.)
Please note that this bug was not triggered by the commit mentioned above,
as this only occurred recently.
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