#19494: Make finite word method nb_subword_occurences_in much faster
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Reporter: slabbe | Owner:
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-6.10
Component: combinatorics | Resolution:
Keywords: | Merged in:
Authors: Sébastien Labbé | Reviewers: Vincent Delecroix
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/slabbe/19494-folded | 580eb72f9868895e6cb7e773324bcf22995ac15e
Dependencies: | Stopgaps:
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Comment (by vdelecroix):
In particular your example where 'vincent' is slower is not an example
{{{
sage: v = Word([0,1,0,1])
sage: u = words.ThueMorseWord()[:100000]
sage: %time v.nb_subword_occurrences_in(u, 'vincent')
CPU times: user 428 ms, sys: 20 ms, total: 448 ms
Wall time: 410 ms
260416666250000000
sage: %time v.nb_subword_occurrences_in(u, 'vincent')
CPU times: user 148 ms, sys: 40 ms, total: 188 ms
Wall time: 151 ms
260416666250000000
sage: %time v.nb_subword_occurrences_in(u, 'matrices')
CPU times: user 312 ms, sys: 12 ms, total: 324 ms
Wall time: 297 ms
260416666250000000
}}}
Though, it would be better to make it return Sage integers instead of
Python integers.
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Ticket URL: <http://trac.sagemath.org/ticket/19494#comment:16>
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