#19378: mod 2, product of nx0 matrix and 0-dimensional vector: segfault
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Reporter: jhpalmieri | Owner:
Type: defect | Status: needs_review
Priority: critical | Milestone: sage-6.9
Component: linear algebra | Resolution:
Keywords: | Merged in:
Authors: Travis Scrimshaw | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
public/modules/gf2_matrix_times_0dim_vector-19378|
ccfd5f827df03f150209d1b347de1853cff1036d
Dependencies: | Stopgaps:
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Changes (by {'newvalue': u'Travis Scrimshaw', 'oldvalue': ''}):
* status: new => needs_review
* commit: => ccfd5f827df03f150209d1b347de1853cff1036d
* branch: => public/modules/gf2_matrix_times_0dim_vector-19378
* author: => Travis Scrimshaw
Comment:
This has to do with the dense `GF(2)` matrices:
{{{
sage: matrix(GF(2), 11, 0, sparse=True) * vector(GF(2), 0)
(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
}}}
Here is a fix which just skips the multiplication of a vector times matrix
since the result will be 0.
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New commits:
||[http://git.sagemath.org/sage.git/commit/?id=ccfd5f827df03f150209d1b347de1853cff1036d
ccfd5f8]||{{{Don't need to multiply if the vector is 0-dimensional.}}}||
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Ticket URL: <http://trac.sagemath.org/ticket/19378#comment:1>
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