#11358: matrix multiplication over ZZ sometimes gives incorrect results
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Reporter: tomc | Owner:
Type: defect | Status: needs_work
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 dsm):
Replying to [comment:11 tomc]:
> I can't get the patch to apply.
Try it against one of the 4.7 release candidates. I should've mentioned
what I was basing it on.
As for the case of running out of primes -- which I considered the
caller's fault, and so I simply warned about it in the docstring rather
than handle it -- I'm fine with whatever. (Once cython 0.15 gets
integrated and we have cythonic generators it may be worth collecting
random prime functions into a fast module of their own.)
Given that the moduli have to be below MAX_MODULUS, it wouldn't cost much
to check whether there really are any primes left and raise an exception
only if we really are done and not merely unlucky. If we're doing that,
though, then we should probably raise the same exception if you ask for
more primes than there are available in extend_moduli_to_count as well.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11358#comment:16>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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