#6980: add _nonzero_positions_by_column to sparse integer matrices
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Reporter: ylchapuy | Owner: was
Type: enhancement | Status: new
Priority: minor | Milestone: sage-4.1.2
Component: linear algebra | Keywords:
Reviewer: | Author: Yann Laigle-Chapuy
Merged: |
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we still use the dense version:
{{{
sage: time matrix(ZZ,5000,sparse=True)._nonzero_positions_by_column()
CPU times: user 5.12 s, sys: 0.01 s, total: 5.14 s
Wall time: 5.19 s
[]
}}}
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/6980>
Sage <http://sagemath.org/>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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