Hi!
Trying to get to coefficients of certain terms in symmetric functions, I am
running
into trouble:
sage: ks = kSchurFunctions(QQ,3,t=1)
sage: f=ks([3,2])+ks([2])
sage: f.monomial_coefficients()
{[3, 2]: 1, [2]: 1}
sage: f.monomial_coefficients().keys()[1].parent()
Partitions of the integer 2
sage: P=f.monomial_coefficients().keys()[1].parent()
sage: f.coefficient(P([2]))
---------------------------------------------------------------------------
AssertionError Traceback (most recent call last)
/Applications/sage-4.7/devel/sage-combinat/<ipython console> in <module>()
/Applications/sage/local/lib/python2.6/site-packages/sage/combinat/free_module.pyc
in coefficient(self, m)
447 # that can be turned on or off
448 C = self.parent()._basis_keys
--> 449 assert m in C, "%s should be an element of %s"%(m, C)
450 if hasattr(C, "element_class") and not isinstance(m,
C.element_class):
451 m = C(m)
AssertionError: [2] should be an element of Partitions of the integer An
example of an infinite enumerated set: the non negative integers satisfying
constraints max_part=3
Why are the parents of the keys different from the actual objects?
How would I build a partition in the correct set "Partitions of the integer An
example of an infinite enumerated set: the non negative integers satisfying constraints
max_part=3?"
without specifying the size of the partition?
The reason why I need this is that I also sometimes need to get the coefficient
of a partition that
is not in the support and hence would expect to get zero.
Thanks,
Anne
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