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Labels: Type-Defect Priority-Medium
New issue 1852 by raffaele.defeo: expand fails when non-commutative
symbols are involved
http://code.google.com/p/sympy/issues/detail?id=1852
x, y = symbols('xy', commutative = False)
expand((x + y)**3)
produces the following
Comment #1 on issue 1852 by raffaele.defeo: expand fails when
non-commutative symbols are involved
http://code.google.com/p/sympy/issues/detail?id=1852
I discovered what the problem is. To correct that issue, it is necessary a
one row
change to the file
Updates:
Status: Accepted
Labels: NeedsReview
Comment #2 on issue 1852 by asmeurer: expand fails when non-commutative
symbols are involved
http://code.google.com/p/sympy/issues/detail?id=1852
That looks like it fixes it, but I need to run the tests to see if it
breaks
Updates:
Labels: -NeedsReview NeedsBetterPatch
Comment #3 on issue 1852 by asmeurer: expand fails when non-commutative
symbols are involved
http://code.google.com/p/sympy/issues/detail?id=1852
OK tests all pass. Could you write this into a git patch and write a test
for it?
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Comment #4 on issue 1852 by raffaele.defeo: expand fails when
non-commutative symbols are involved
http://code.google.com/p/sympy/issues/detail?id=1852
I can try... but this would be my git first time.
Is there a tutorial to follow? All of the instructions I found refer to the
use of
Comment #5 on issue 1852 by asmeurer: expand fails when non-commutative
symbols are involved
http://code.google.com/p/sympy/issues/detail?id=1852
Yes. Ondrej made tutorial specifically for SymPy. You can find them here:
http://code.google.com/p/sympy/wiki/GitTutorials.
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Comment #6 on issue 1852 by smichr: expand fails when non-commutative
symbols are involved
http://code.google.com/p/sympy/issues/detail?id=1852
It passes everything in 1766, too...but the issue is also present for a
non-Add base:
(x*y)**3 - x**3*y**3 instead of x*y*x*y*x*y
Also, in
Comment #7 on issue 1852 by asmeurer: expand fails when non-commutative
symbols are involved
http://code.google.com/p/sympy/issues/detail?id=1852
This is related to issue 1261.
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Comment #8 on issue 1852 by raffaele.defeo: expand fails when
non-commutative symbols are involved
http://code.google.com/p/sympy/issues/detail?id=1852
I hope the patch is good!
Attachments:
non-commutative-multinomial-power-expansion.patch 2.6 KB
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Updates:
Labels: -NeedsBetterPatch PassedReview
Comment #9 on issue 1852 by asmeurer: expand fails when non-commutative
symbols are involved
http://code.google.com/p/sympy/issues/detail?id=1852
Thanks. This looked fine, so I pushed it in. Chris, does your problem
still apply
Comment #10 on issue 1852 by smichr: expand fails when non-commutative
symbols are involved
http://code.google.com/p/sympy/issues/detail?id=1852
1261...and I raised a question there.
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Updates:
Status: Fixed
Comment #11 on issue 1852 by asmeurer: expand fails when non-commutative
symbols are involved
http://code.google.com/p/sympy/issues/detail?id=1852
OK. I will close it then.
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