#19481: No cardinality for virtual crystals
-----------------------------+-----------------------------
Reporter: aschilling | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.10
Component: combinatorics | Keywords: crystals
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
-----------------------------+-----------------------------
When one slightly changes the following example in the documentation:
{{{
sage: from sage.combinat.crystals.virtual_crystal import
VirtualCrystal
sage: A = crystals.Tableaux(['A',3], shape=[2,1,1])
sage: V = VirtualCrystal(A, {1:(1,3), 2:(2,)}, {1:1, 2:2},
cartan_type=['C',2])
sage: G = crystals.Tableaux(['C',2], shape=[1]).digraph()
sage: V.digraph().is_isomorphic(G, edge_labels=True)
True
}}}
to
{{{
sage: from sage.combinat.crystals.virtual_crystal import
VirtualCrystal
sage: A = crystals.Tableaux(['A',3], shape=[2,1,1])
sage: V = VirtualCrystal(A, {1:(1,3), 2:(2,)}, {1:1, 2:2},
cartan_type=['C',2])
sage: R = RootSystem(['C',2])
sage: Lambda = R.weight_space()
sage: La=Lambda.fundamental_weights()
sage: G = crystals.LSPaths(La[1])
sage: V.digraph().is_isomorphic(G, edge_labels=True)
---------------------------------------------------------------------------
AttributeError Traceback (most recent call
last)
<ipython-input-8-d91276b648e9> in <module>()
----> 1 V.digraph().is_isomorphic(G, edge_labels=True)
/Applications/sage/local/lib/python2.7/site-
packages/sage/graphs/generic_graph.pyc in is_isomorphic(self, other,
certify, verbosity, edge_labels)
20442 """
20443
> 20444 if self.order() == other.order() == 0:
20445 return (True, None) if certify else True
20446
/Applications/sage/src/sage/structure/parent.pyx in
sage.structure.parent.Parent.__getattr__
(/Applications/sage/src/build/cythonized/sage/structure/parent.c:8095)()
840 return self.__cached_methods[name]
841 except KeyError:
--> 842 attr = getattr_from_other_class(self,
self._category.parent_class, name)
843 self.__cached_methods[name] = attr
844 return attr
/Applications/sage/src/sage/structure/misc.pyx in
sage.structure.misc.getattr_from_other_class
(/Applications/sage/src/build/cythonized/sage/structure/misc.c:1667)()
251 dummy_error_message.cls = type(self)
252 dummy_error_message.name = name
--> 253 raise dummy_attribute_error
254 try:
255 attribute = getattr(cls, name)
AttributeError: 'CrystalOfLSPaths_with_category' object has no attribute
'order'
}}}
Also cardinality is not defined for virtual crystals:
{{{
sage: V.cardinality()
---------------------------------------------------------------------------
AttributeError Traceback (most recent call
last)
<ipython-input-9-36235162fdc4> in <module>()
----> 1 V.cardinality()
/Applications/sage/local/lib/python2.7/site-
packages/sage/combinat/crystals/subcrystal.pyc in cardinality(self)
262 if self in FiniteCrystals():
263 return Integer(len(self.list()))
--> 264 card = super(Subcrystal, self).cardinality()
265 if card == infinity:
266 self._cardinality = card
AttributeError: 'super' object has no attribute 'cardinality'
}}}
--
Ticket URL: <http://trac.sagemath.org/ticket/19481>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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