#13204: Element construction for CrystalOfTableaux should be robust versus
int's
---------------------------------+------------------------------------------
Reporter: nthiery | Owner: sage-combinat
Type: defect | Status: new
Priority: major | Milestone: sage-5.2
Component: combinatorics | Keywords:
Work issues: | Report Upstream: N/A
Reviewers: Nicolas M. Thiéry | Authors: Anne Schilling
Merged in: | Dependencies:
Stopgaps: |
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When constructing elements of a crystal of tableaux, the entries are
converted to crystal letters if they are not yet such::
{{{
sage: T = CrystalOfTableaux(['A',3], shape = [2,2])
sage: t = T(list=[3,1,4,2])
sage: t
[[1, 2], [3, 4]]
sage: type(t[0])
<class
'sage.combinat.crystals.letters.ClassicalCrystalOfLetters_with_category.element_class'>
sage: type(t[1])
<class
'sage.combinat.crystals.letters.ClassicalCrystalOfLetters_with_category.element_class'>
}}}
However this is currently not the case if the entries are plain int's::
{{{
sage: t = T(list=[int(3),1,4,2])
sage: type(t[0])
<type 'int'>
sage: type(t[1])
<type 'sage.rings.integer.Integer'>
}}}
Possible fix: have CrystalOfTableauxElement.__init__ check whether
list[0] is not an instance of parent.letters.element_class instead of
testing for an Integer.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13204>
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