#2705: random_matrix with sparse=True is very slow
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Reporter: dfdeshom | Owner: was
Type: enhancement | Status: needs_info
Priority: major | Milestone: sage-4.7.1
Component: linear algebra | Keywords:
Work_issues: | Upstream: N/A
Reviewer: | Author:
Merged: | Dependencies:
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Description changed by ryan:
Old description:
> Creating a 2000x200 full matrix is much faster than creating a 500x500
> sparse matrix:
>
> {{{
> sage: %time A = random_matrix(ZZ,2000)
> CPU times: user 0.97 s, sys: 0.28 s, total: 1.25 s
> Wall time: 1.25
>
> sage: %time B = random_matrix(ZZ,500,sparse=True)
> CPU times: user 7.20 s, sys: 0.00 s, total: 7.20 s
> Wall time: 7.20
> }}}
New description:
Creating a 2000x2000 full matrix is much faster than creating a 500x500
sparse matrix:
{{{
sage: %time A = random_matrix(ZZ,2000)
CPU times: user 0.97 s, sys: 0.28 s, total: 1.25 s
Wall time: 1.25
sage: %time B = random_matrix(ZZ,500,sparse=True)
CPU times: user 7.20 s, sys: 0.00 s, total: 7.20 s
Wall time: 7.20
}}}
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/2705#comment:3>
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