Re: Issue 3145 in sympy: simultaneous substitution

2012-03-14 Thread sympy
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

Re: Issue 3145 in sympy: simultaneous substitution

2012-03-16 Thread sympy
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. -- You received this message because you are subscribed to the Google Groups "sympy-patches" group. To post t

Re: Issue 3145 in sympy: simultaneous substitution

2012-03-16 Thread sympy
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

Re: Issue 3145 in sympy: simultaneous substitution

2012-03-16 Thread sympy
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)]))` -- You received this message because you are subscribed to the Google

Re: Issue 3145 in sympy: simultaneous substitution

2012-03-16 Thread sympy
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

Re: Issue 3145 in sympy: simultaneous substitution

2012-03-16 Thread sympy
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

Re: Issue 3145 in sympy: simultaneous substitution

2012-03-16 Thread sympy
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

Re: Issue 3145 in sympy: simultaneous substitution

2012-03-16 Thread sympy
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

Re: Issue 3145 in sympy: simultaneous substitution

2012-03-16 Thread Chris Smith
On Sat, Mar 17, 2012 at 5:59 AM, wrote: > > 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. > >

Re: Issue 3145 in sympy: simultaneous substitution

2012-03-16 Thread sympy
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. -- You received this message because you are subscribed to the Google Groups "sympy-patch