#8595: Fixed point of word morphism is broken on some tuple input
-----------------------------+----------------------------------------------
Reporter: slabbe | Owner: slabbe
Type: defect | Status: new
Priority: major | Milestone: sage-4.4
Component: combinatorics | Keywords:
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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From [http://groups.google.com/group/sage-combinat-
devel/browse_thread/thread/3d5e4db608049516?hl=en sage-combinat-devel
group] :
{{{
2010/3/23 Vincent Delecroix
> Hi,
>
> I tried the following and get an unexpected error
>
> {{{
> sage: s = WordMorphism({'a1': ['a1','a2'], 'a2':['a1']})
> sage: s.fixed_point('a1')
> Traceback
> ...
> KeyError: 'a'
> }}}
>
> and it does the same for tuples
>
> {{{
> sage: s = WordMorphism({('a', 1) : [('a', 1), ('a', 2)], ('a', 2) :
[('a', 1)]})
> sage: s.fixed_point(('a', 1))
> Traceback
> ...
> KeyError: 'a'
> }}}
>
> Is it a bug or not the right way to do ?
>
> (On this example it looks strange but I really need product alphabet)
>
> Cheers,
> Vincent
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8595>
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