#10950: The hash function for matrices suffers from many collisions with
permutation matrices
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Reporter: nthiery | Owner: jason, was
Type: defect | Status: new
Priority: major | Milestone:
Component: linear algebra | Keywords: Weyl groups, permutation
matrices, hash
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Changes (by nthiery):
* keywords: Weyl groups => Weyl groups, permutation matrices, hash
Comment:
Replying to [comment:3 jhpalmieri]:
> Note that in {{{m = p.to_matrix()}}}, the matrix m is sparse, not dense
(as far as I can tell), so you'll need to patch both matrix_dense.pyx and
matrix_sparse.pyx.
Oops. I changed my examples at the last minute, thinking that permutation
matrices would feel less exotic than Weyl groups, but I forgot to actually
check that my patch fixed the problem for those. Thanks for pointing this
out!
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/10950#comment:4>
Sage <http://www.sagemath.org>
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