Updates:
Cc: asmeurer Vinzent.Steinberg
Labels: NeedsReview
Comment #12 on issue 666 by smichr: sorting of expressions makes
subs_dict() fail
http://code.google.com/p/sympy/issues/detail?id=666
branch ops at github/smichr proposes a fix for the dilemma of comment 7
which ensures that longer patterns will always be found before shorter
patterns. An upgrade to allow static substitutions was also added, but
otherwise as little as possible was done to the current structure of subs.
(x**y)({x:y, y:x}, static=1) # no longer either x**x nor y**y
y**x
The example from comment 7 now gives:
ff = exp(x) + exp(-x+x*y)
a=exp(x)
b=exp(-x+x*y)
A,B=symbols('AB')
ff.subs([(a,A), (b,B)])
A + exp(x*y)/A
ff.subs([(b,B), (a,A)])
A + B
ff.subs(dict([(b,B), (a,A)])) # properly sorted now
A + B
There is one puzzling test in tsolve that is failing. If someone could take
a look that would be helpful. I don't see why the answer is not seen in the
list.
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