#20956: Number of reflections in Weyl and Coxeter groups can be computed faster
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Reporter: stumpc5 | Owner:
Type: enhancement | Status: new
Priority: major | Milestone: sage-7.3
Component: combinatorics | Resolution:
Keywords: reflection group, coxeter | Merged in:
group, subword complex, days80 |
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by chapoton):
Some timings with the branch of #20943
{{{
sage: sage: W = WeylGroup(['E',7])
sage: sage: %timeit len(W.long_element(as_word=True))
10 loops, best of 3: 41.6 ms per loop
sage: sage: %timeit W.number_of_reflections()
The slowest run took 1047579.52 times longer than the fastest.
This could mean that an intermediate result is being cached.
10000000 loops, best of 3: 57.2 ns per loop
sage: sage: %timeit sum(d-1 for d in W.degrees())
10 loops, best of 3: 41.1 ms per loop
}}}
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Ticket URL: <https://trac.sagemath.org/ticket/20956#comment:1>
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