Status: Accepted
Owner: [email protected]
Labels: Type-Defect Priority-Medium
New issue 2393 by [email protected]: Sum error
http://code.google.com/p/sympy/issues/detail?id=2393
When defining a function that returns 1 for integers and 0 for everything
else the following sum fails:
In [1]: def a(k):
if type(k) == int or k.is_Integer:
return 1
return 0
In [2]: a(5)
Out[2]: 1
In [3]: Sum(a(k),(k,1,10)).doit()
Out[3]: 0
Expected result would be 10.
I may be failing in defining such function, but at least is a strange
behaviour.
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