#14007: When computing determinant over GF(p), don't lift to ZZ
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Reporter: jdemeyer | Owner: jason, was
Type: enhancement | Status: positive_review
Priority: blocker | Milestone: sage-5.7
Component: linear algebra | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers: Charles Bouillaguet
Authors: Jeroen Demeyer | Merged in:
Dependencies: | Stopgaps:
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Changes (by Bouillaguet):
* status: needs_review => positive_review
* reviewer: => Charles Bouillaguet
Comment:
There is a convincing improvement :
{{{
sage: M = random_matrix( Integers( next_prime( factorial(10) ) ), 400 )
sage: time M.det()
Time: CPU 0.04 s, Wall: 0.03 s
}}}
versus :
{{{
sage: M = random_matrix( Integers( next_prime( factorial(10) ) + 1), 400 )
sage: time M.det()
Time: CPU 4.65 s, Wall: 3.99 s
}}}
Positive review !
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/14007#comment:5>
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