#11187: Implementation of finite reflection groups
-------------------------------------+-------------------------------------
Reporter: stumpc5 | Owner: tbd
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-6.4
Component: combinatorics | Resolution:
Keywords: reflection group, | Merged in:
days49 | Reviewers:
Authors: Christian Stump | Work issues:
Report Upstream: N/A | Commit:
Branch: | c0a036b2e2f01b1be6a7d004373fafe0c399e14d
u/SimonKing/11187-new | Stopgaps:
Dependencies: #8327 #14137 |
-------------------------------------+-------------------------------------
Changes (by SimonKing):
* commit: 425ca38c084a51fa56c301153165269031fb5e0d =>
c0a036b2e2f01b1be6a7d004373fafe0c399e14d
Comment:
After discussion with Christian, the iterator of a complex reflection
group is a lot faster. What we did was to keep `._reduced_word` as a list,
and only transform it into an actual word when needed (i.e., in the
`.reduced_word()` method).
Before:
{{{
sage: G = ComplexReflectionGroup([2,1,4])
sage: %timeit L = list(G); G._elements=None
The slowest run took 6.02 times longer than the fastest. This could mean
that an intermediate result is being cached
1 loops, best of 3: 66.4 ms per loop
}}}
After:
{{{
sage: G = ComplexReflectionGroup([2,1,4])
sage: %timeit L = list(G); G._elements=None
The slowest run took 66.44 times longer than the fastest. This could mean
that an intermediate result is being cached
1 loops, best of 3: 5.56 ms per loop
}}}
----
New commits:
||[http://git.sagemath.org/sage.git/commit/?id=c0a036b2e2f01b1be6a7d004373fafe0c399e14d
c0a036b]||{{{Avoid creation of _reduced_word during iteration}}}||
--
Ticket URL: <http://trac.sagemath.org/ticket/11187#comment:49>
Sage <http://www.sagemath.org>
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