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New issue 3145 by smi...@gmail.com: simultaneous substitution
http://code.google.com/p/sympy/issues/detail?id=3145
An option that we might consider for substitution is a "simultaneous"
option where any arg that is targeted for sub
Updates:
Labels: NeedsReview smichr
Comment #1 on issue 3145 by smi...@gmail.com: simultaneous substitution
http://code.google.com/p/sympy/issues/detail?id=3145
The use of the parallel keyword is possible in
https://github.com/sympy/sympy/pull/690 . This allows all substitutions to
t
Comment #2 on issue 3145 by julien.r...@gmail.com: simultaneous substitution
http://code.google.com/p/sympy/issues/detail?id=3145
"simultaneous=True" seems like a better keyword to me.
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Comment #3 on issue 3145 by pr...@goodok.ru: simultaneous substitution
http://code.google.com/p/sympy/issues/detail?id=3145
First of all, I think that it is problem in the assumption system or in the
cancellation or in the automatic simplification of a*1/S.Zero --> a*oo
a*1/S.Zero
oo*a
wh
Comment #4 on issue 3145 by pr...@goodok.ru: simultaneous substitution
http://code.google.com/p/sympy/issues/detail?id=3145
Upon XFAIL I meant `(sqrt(a/b)).subs([(a,0),(b,0)]) <>
(sqrt(a/b)).subs(reversed([(a,0),(b,0)]))`
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Comment #5 on issue 3145 by smi...@gmail.com: simultaneous substitution
http://code.google.com/p/sympy/issues/detail?id=3145
"simultaneous=True" seems like a better keyword to me.
what about 'static' (as in "subsequent replacements don't affect former
replacements" and "all replacement is d
Comment #6 on issue 3145 by pr...@goodok.ru: simultaneous substitution
http://code.google.com/p/sympy/issues/detail?id=3145
'static` is confusing (because it can be related with the programming
scope) `accurate`, `careful` id blinded, but more better (in my opinion) is
`before_evaluation` or
Comment #7 on issue 3145 by smi...@gmail.com: simultaneous substitution
http://code.google.com/p/sympy/issues/detail?id=3145
Implicitly this transformation assumes that a<>0.
I'm not sure that it matters since if you let a == 0 you get nan, the same
as if you do `S(0)/0`, and you get +/-oo
Comment #8 on issue 3145 by pr...@goodok.ru: simultaneous substitution
http://code.google.com/p/sympy/issues/detail?id=3145
But I get a*oo even when it is not know whether `a<>0` or not.
About PR 609, I commented it (one critical remark).
The wave of GCI covered us, and the new one approaching
Updates:
Status: Fixed
Comment #9 on issue 3145 by smi...@gmail.com: simultaneous substitution
http://code.google.com/p/sympy/issues/detail?id=3145
simultaneous substitution is now part of master.
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