#11358: matrix multiplication over ZZ sometimes gives incorrect results
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Reporter: tomc | Owner: jason, was
Type: defect | Status: new
Priority: critical | Milestone: sage-4.7.1
Component: linear algebra | Keywords: matrix multiplication,
multi-modular, integers, ZZ
Work_issues: | Upstream: N/A
Reviewer: | Author:
Merged: | Dependencies:
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Comment(by rbeezer):
From #sagemath on IRC:
{{{
[07:11] <sagebot> New news from tractimeline: Ticket #11358 (matrix
multiplication over ZZ sometimes gives incorrect results) created
[07:32] <logix> hm, i just tried to reproduce that bug (which i can), and
it failed both times when B had a full zero column
[07:32] <logix> (which is the case in the bug report too)
[07:33] <logix> perhaps that's the condition triggering the bug?
[07:34] <logix> i mean one of the conditions triggering the bug (there
must be something else, as the inner loop runs more than once and it fails
only sometimes
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11358#comment:3>
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