#18177: Warning to Matrix.random()
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Reporter: jmantysalo | Owner:
Type: defect | Status: needs_review
Priority: minor | Milestone: sage-6.6
Component: linear algebra | Resolution:
Keywords: | Merged in:
Authors: Jori Mäntysalo | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/jmantysalo/warning_to_matrix_random__|
371e40fe64f300e48ceeacc69f9d09405674b3a3
Dependencies: | Stopgaps:
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Comment (by jmantysalo):
Replying to [comment:3 ncohen]:
> Looks good. A naive request: if there is an example of small order for
which you are sure that a given matrix `M` is never returned, could you
add a doctest/example to this warning to illustrate it?
>
> Something like {{{all(a_random_matrix() != m for i in range(100))}}}?
Hmm... For unimodular `3x3` matrices over `GF(3)` there seems to be `3^5`
different matrix that are never returned. But for `2x2` over `GF(2)` there
are only 3 of those. Easiest example is `M=Matrix([[0,2],[2,0]])`. But is
this information useful to user?
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Ticket URL: <http://trac.sagemath.org/ticket/18177#comment:4>
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