#18787: Bug with products of symbolic variables with modular integers
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Reporter: tmonteil | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.8
Component: symbolics | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Description changed by jdemeyer:
Old description:
> As reported on [http://ask.sagemath.org/question/27196/multiplying-
> matrices-with-different-parents/ this ask question]
>
> {{{
> sage: _ = var('A,B')
> sage: (A + 3*B)*Zmod(9)(6)
> 0*B
> }}}
>
> while the result should be `6*A`. There is even (with the 6.6 Linux
> tarball)
> {{{
> sage: (3*A + 3*B + 1)*Zmod(9)(6)
> 6
> sage: (3*A + 3*B)*Zmod(9)(6)
> <------------ !!
> sage:
> }}}
New description:
As reported on [http://ask.sagemath.org/question/27196/multiplying-
matrices-with-different-parents/ this ask question]
{{{
sage: _ = var('A,B')
sage: (A + 3*B)*Zmod(9)(6)
0*B
}}}
while the result should be `6*A`.
It seems that the internal state of these objects is really messed up:
{{{
sage: _ = var('A,B')
sage: (3*A + 3*B)*Zmod(9)(6) # Yes, the output is really empty!
sage: (3*A + 3*B)*Zmod(9)(6)*A
------------------------------------------------------------------------
Unhandled SIGSEGV: A segmentation fault occurred in Sage.
This probably occurred because a *compiled* component of Sage has a bug
in it and is not properly wrapped with sig_on(), sig_off().
Sage will now terminate.
------------------------------------------------------------------------
}}}
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Ticket URL: <http://trac.sagemath.org/ticket/18787#comment:13>
Sage <http://www.sagemath.org>
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