#12997: LyndonWords from composition beginning by 0's
-----------------------------------------------+----------------------------
Reporter: Adrien | Owner: sage-combinat
Type: defect | Status: new
Priority: minor | Milestone: sage-5.1
Component: combinatorics | Resolution:
Keywords: lyndon words, sage-combinat | Work issues:
Report Upstream: N/A | Reviewers:
Authors: | Merged in:
Dependencies: | Stopgaps:
-----------------------------------------------+----------------------------
Description changed by Adrien:
Old description:
> LyndonWords, when applied to a composition starting with 0's, gives a
> wrong result, e.g.:
>
> for w in LyndonWords(list([0,1])):
> print w
>
> return 1 instead of 2, and in a similar vein
>
> for w in LyndonWords(list([0,2])):
> print w
>
> return '12'
>
> The problem is also described here : http://groups.google.com/group/sage-
> combinat-devel/browse_thread/thread/5c4b691a692b56b0#
>
> The problem is that necklace._sfc() ignores 0's at the begining of a
> list.
>
> A modified lyndon_word.py file which fix the problem is attached.
New description:
{{{LyndonWords}}}, when applied to a composition starting with 0's, gives
a wrong result, e.g.:
{{{
for w in LyndonWords(list([0,1])):
print w
}}}
return 1 instead of 2, and in a similar vein
{{{
for w in LyndonWords(list([0,2])):
print w
}}}
return '12'
The problem is also described here : http://groups.google.com/group/sage-
combinat-devel/browse_thread/thread/5c4b691a692b56b0#
The problem is that necklace._sfc() ignores 0's at the begining of a list.
A modified lyndon_word.py file which fix the problem is attached.
--
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12997#comment:1>
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