#11382: subposet is too slow
-----------------------------+----------------------------------------------
Reporter: hivert | Owner: sage-combinat
Type: defect | Status: new
Priority: major | Milestone: sage-4.7.1
Component: combinatorics | Keywords: poset subposet
Work_issues: | Upstream: N/A
Reviewer: | Author: Florent Hivert
Merged: | Dependencies:
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A lot of unnecessary and redundant check are performed. See a more precise
analyze on
[http://groups.google.com/group/sage-combinat-
devel/browse_thread/thread/545480705ce92eaa| this thread] of sage-
combinat-devel
{{{
sage: P = cutting_poset(WeylGroup(['A',4]))
sage: P.cardinality()
24
}}}
Before:
{{{
sage: %timeit P.subposet(P.list()[1:])
5 loops, best of 3: 214 ms per loop
}}}
After:
{{{
sage: %timeit P.subposet(P.list()[1:])
25 loops, best of 3: 24.8 ms per loop
}}}
Here is another timing for a bigger poset:
{{{
sage: P = cutting_poset(WeylGroup(['A',4]))
sage: P.cardinality()
120
}}}
Before:
{{{
sage: %timeit P.subposet(P.list()[1:])
5 loops, best of 3: 28.8 s per loop
}}}
After:
{{{
sage: %timeit P.subposet(P.list()[1:])
5 loops, best of 3: 597 ms per loop
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11382>
Sage <http://www.sagemath.org>
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