#20484: Use the cythonized versions of has_descent, first_descent, descents for
reflection groups
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Reporter: stumpc5 | Owner:
Type: enhancement | Status: new
Priority: major | Milestone: sage-7.2
Component: combinatorics | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by stumpc5):
For the record: subword complexes would appreciate fast
{{{apply_simple_reflection_left}}} and {{{has_left_descent}}}, see
{{{
sage:W = ReflectionGroup(['A',8])
sage: c = W.index_set(); Q = c + tuple(W.w0.coxeter_sorting_word(c))
sage: %prun SC = SubwordComplex(Q,W.w0)
4679142 function calls (4679130 primitive calls) in 8.222 seconds
Ordered by: internal time
ncalls tottime percall cumtime percall filename:lineno(function)
772419 2.634 0.000 3.119 0.000
complex_reflection_or_generalized_coxeter_groups.py:831(apply_simple_reflection_left)
1163569 2.464 0.000 2.648 0.000
reflection_group_real.py:771(has_left_descent)
1 2.229 2.229 7.997 7.997
{sage.combinat.subword_complex_c._construct_facets_c}
}}}
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Ticket URL: <http://trac.sagemath.org/ticket/20484#comment:1>
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