#16617: simple echelon matrix iterator
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Reporter: vdelecroix | Owner:
Type: enhancement | Status: needs_info
Priority: major | Milestone: sage-6.3
Component: linear algebra | Resolution:
Keywords: matrix | Merged in:
Authors: Vincent Delecroix | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/vdelecroix/16617 | f3cc9b7a9979e164565df53fa11dd6f8647a6ee9
Dependencies: | Stopgaps:
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Changes (by ncohen):
* status: needs_review => needs_info
Comment:
Helloooooooooooo !
First of all, I don't get why you wrote this in Cython instead of changing
the old implementation... Does it change much to the performance ? I
wonder if you wouldn't obtain the same crazy speedups simply caching `m0`
as you do and using itertools instead of `VectorSpace`.. Or is it that you
want to aviod the final matrix multiplication ?
Details:
- It seems that what you do is iterate on *reduced* echelon form
- {{{number of columnes}}}
- Could you add a doctest like that ?
{{{
sage: q=71
sage: F = GF(q)
sage: len(list(echelon_matrix_iterator(F, 1, 3, copy=False))) == q**2+q+1
True
sage: len(list(echelon_matrix_iterator(F, 2, 3, copy=False))) == q**2+q+1
True
}}}
- I do not understand why you have to call {{{del}}} `O_o`
Nathann
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Ticket URL: <http://trac.sagemath.org/ticket/16617#comment:4>
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