#5402: Sparse determinants are slow
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Reporter: jbandlow | Owner: was
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-5.6
Component: linear algebra | Resolution:
Keywords: determinant | Work issues:
Report Upstream: N/A | Reviewers:
Authors: Charles Bouillaguet | Merged in:
Dependencies: | Stopgaps:
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Changes (by {'newvalue': u'Charles Bouillaguet', 'oldvalue': ''}):
* status: needs_work => needs_review
* author: => Charles Bouillaguet
Comment:
With patch applied:
{{{
sage: dd = {(0,0):1}
sage: %timeit matrix(100,dd).det()
125 loops, best of 3: 7.04 ms per loop
sage: %timeit matrix(100,dd,sparse = False).det()
25 loops, best of 3: 16.3 ms per loop
}}}
So that now the sparse case is faster! I really don't understand why
tough, because it converts the matrix to a dense representation before
computing the (dense) det...
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/5402#comment:9>
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