#14032: determinant() of large integer matrices broken
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Reporter: jdemeyer | Owner: jason, was
Type: defect | Status: new
Priority: critical | Milestone: sage-5.7
Component: linear algebra | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers:
Authors: | Merged in:
Dependencies: | Stopgaps:
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Comment (by jdemeyer):
Also, the `padic` algorithm seems to have some pathological cases:
{{{
sage: M = matrix(100, 100, lambda i,j: ZZ.random_element(2))
sage: timeit('M.det(algorithm="padic")')
5 loops, best of 3: 219 ms per loop
sage: timeit('M.det(algorithm="ntl")')
625 loops, best of 3: 789 ns per loop
sage: timeit('M.det(algorithm="pari")')
625 loops, best of 3: 777 ns per loop
}}}
That's 5 orders of magnitude slower!
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/14032#comment:2>
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