#6553: [with patch, needs review] fast slicing of sparse matrices
----------------------------+-----------------------------------------------
Reporter: jason | Owner: was
Type: defect | Status: new
Priority: major | Milestone: sage-4.1.1
Component: linear algebra | Keywords:
Reviewer: | Author: Jason Grout
Merged: |
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Comment(by jason):
Before, I waited for several minutes before giving up.
AFTER:
{{{
sage: A=random_matrix(ZZ,100000,density=.00005,sparse=True)
sage: %time A[50000:,:50000]
CPU times: user 0.43 s, sys: 0.01 s, total: 0.44 s
Wall time: 0.47 s
50000 x 50000 sparse matrix over Integer Ring
}}}
Also:
BEFORE:
{{{
sage: A=random_matrix(ZZ,10000,density=.00005,sparse=True)
sage: %time A[5000:,:5000]
CPU times: user 8.32 s, sys: 0.02 s, total: 8.34 s
Wall time: 8.69 s
5000 x 5000 sparse matrix over Integer Ring
}}}
AFTER:
{{{
sage: A=random_matrix(ZZ,10000,density=.00005,sparse=True)
sage: %time A[5000:,:5000]
CPU times: user 0.04 s, sys: 0.00 s, total: 0.04 s
Wall time: 0.08 s
5000 x 5000 sparse matrix over Integer Ring
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/6553#comment:1>
Sage <http://sagemath.org/>
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