#10667: Morphisms and Objects of Categories
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Reporter: SimonKing | Owner: nthiery
Type: enhancement | Status: needs_work
Priority: major | Milestone:
Component: categories | Keywords: objects morphisms containment
Work_issues: | Upstream: N/A
Reviewer: | Author: Simon King
Merged: | Dependencies:
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Comment(by SimonKing):
I have updated the patch, so that it should apply against
sage-4.7.2.alpha2. I did not run tests, yet. Here are some timings:
{{{
sage: from sage.rings.commutative_ring import is_CommutativeRing
sage: %timeit is_CommutativeRing(QQ)
625 loops, best of 3: 1.09 µs per loop
sage: C = CommutativeRings().objects()
sage: %timeit QQ in C
625 loops, best of 3: 3.82 µs per loop
}}}
`is_CommutativeRing` simply tests whether `QQ` is an instance of
`sage.rings.ring.CommutativeRing`, which is of course very fast (but not
very reliable from a mathematical point of view.
Anyway, I try to squeeze `QQ in C` a bit more.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/10667#comment:11>
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