One of the examples in the docstring for DisjointUnionEnumeratedSet
goes something like this:
sage: U = DisjointUnionEnumeratedSets(Family(NonNegativeIntegers(),
Permutations))
sage: it = iter(U)
sage: it.next()
[]
If I try the same thing, replacing "Permutations" with "Partitions",
it doesn't work:
sage: U = DisjointUnionEnumeratedSets(Family(NonNegativeIntegers(),
Partitions))
sage: it = iter(U)
sage: it.next()
---------------------------------------------------------------------------
ValueError Traceback (most recent call
last)
/Users/palmieri/<ipython console> in <module>()
/Applications/sage/local/lib/python2.6/site-packages/sage/sets/
disjoint_union_enumerated_sets.pyc in __iter__(self)
398 """
399 for k in self._family.keys():
--> 400 for el in self._family[k]:
401 if self._keepkey:
402 el = (k, el)
/Applications/sage/local/lib/python2.6/site-packages/sage/sets/
family.pyc in __getitem__(self, i)
939 10
940 """
--> 941 return self.function(i)
942
943 def __getstate__(self):
/Applications/sage/local/lib/python2.6/site-packages/sage/combinat/
combinat.pyc in __call__(self, x)
1013 return self._element_constructor_(x)
1014 else:
-> 1015 raise ValueError, "%s not in %s"%(x, self)
1016
1017 Element = CombinatorialObject # mostly for backward
compatibility
ValueError: 0 not in Partitions
Is this expected?
--
John
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