#10054: Provide an alphabet to the parent of any generated word
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Reporter: tmonteil | Owner: sage-combinat
Type: defect | Status: new
Priority: major | Milestone: sage-4.6
Component: combinatorics | Keywords:
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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The current situation is not uniform, some word generators provide an
alphabet to their parent, some other do not. Currently, the policy can be
different even for close word generators:
{{{
sage: words.LowerMechanicalWord(1/sqrt(2)).parent()
Words
sage: words.CharacteristicSturmianWord(1/sqrt(2)).parent()
Words over Ordered Alphabet [0, 1]
}}}
There should be an overall policy (to be discussed in the community).
My point of view is that we should provide a default alphabet each time we
know it a priori, so that accessing this info will take a constant time,
otherwise the user will sometimes have to use a parsing function that will
take a linear time.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/10054>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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