Comment #10 on issue 3006 by asmeu...@gmail.com: sign(Symbol('z',
zero=True)) -> sign(z)
http://code.google.com/p/sympy/issues/detail?id=3006
Well, if you think it should be changed back, we can discuss it. We really
need to consider how things will work in the new assumptions. I guess
Comment #9 on issue 3006 by julien.r...@gmail.com: sign(Symbol('z',
zero=True)) -> sign(z)
http://code.google.com/p/sympy/issues/detail?id=3006
The assumption mechanism naturally supports having a symbol representing
zero, so I don't see a reason to disallow it (and even less so if it
inv
Comment #8 on issue 3006 by asmeu...@gmail.com: sign(Symbol('z',
zero=True)) -> sign(z)
http://code.google.com/p/sympy/issues/detail?id=3006
Hmm, I never considered that. If we don't allow Symbol(zero=True), should
we allow symbols that directly imply zero=True?
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Comment #7 on issue 3006 by julien.r...@gmail.com: sign(Symbol('z',
zero=True)) -> sign(z)
http://code.google.com/p/sympy/issues/detail?id=3006
I think so, because
1) Using .is_zero would for example also handle Float('0') (once
Float('0').is_zero is fixed, see https://github.com/sympy/sym
Comment #6 on issue 3006 by asmeu...@gmail.com: sign(Symbol('z',
zero=True)) -> sign(z)
http://code.google.com/p/sympy/issues/detail?id=3006
If issue 3134 was closed, is this still relevant?
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Labels: EasyToFix
Blockedon: -sympy:3134 sympy:3134
Comment #5 on issue 3006 by julien.r...@gmail.com: sign(Symbol('z',
zero=True)) -> sign(z)
http://code.google.com/p/sympy/issues/detail?id=3006
(No comment was entered for this change.)
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Blockedon: 3134
Comment #3 on issue 3006 by asmeu...@gmail.com: sign(Symbol('z',
zero=True)) -> sign(z)
http://code.google.com/p/sympy/issues/detail?id=3006
I think it's better to block this issue on that one.
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Comment #2 on issue 3006 by smi...@gmail.com: sign(Symbol('z', zero=True))
-> sign(z)
http://code.google.com/p/sympy/issues/detail?id=3006
Issue 3134 has been merged into this issue.
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Labels: Assumptions
Comment #1 on issue 3006 by asmeu...@gmail.com: sign(Symbol('z',
zero=True)) -> sign(z)
http://code.google.com/p/sympy/issues/detail?id=3006
I guess it boils down to using is_zero instead of "is S.Zero". But I don't
get why we allow Symbol(zero=True).
Status: Accepted
Owner:
Labels: Type-Defect Priority-Medium
New issue 3006 by smi...@gmail.com: sign(Symbol('z', zero=True)) -> sign(z)
http://code.google.com/p/sympy/issues/detail?id=3006
Although sign(p) (where p is Symbol('p', positive=True)) gives 1, sign of a
symbol which is zero doe
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