#16306: Replace =0 by is_zero() in test for matrix being alternating
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Reporter: darij | Owner:
Type: defect | Status: needs_review
Priority: trivial | Milestone: sage-6.3
Component: linear algebra | Resolution:
Keywords: | Merged in:
Authors: Darij Grinberg | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
public/combinat/matrix0-fix | 46f627eb1d6387b28732d73bf3a7e9994b1db96f
Dependencies: | Stopgaps:
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Comment (by vdelecroix):
Replying to [comment:7 darij]:
> Actually, checking equality with parent.zero() is even faster than
checking is_zero(). I'll push this once I am back home.
This is not true for integers
{{{
sage: n=12
sage: %timeit n.is_zero()
1000000 loops, best of 3: 204 ns per loop
sage: %timeit n == n.parent().zero()
1000000 loops, best of 3: 463 ns per loop
}}}
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Ticket URL: <http://trac.sagemath.org/ticket/16306#comment:11>
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