Comment #10 on issue 2723 by [email protected]: What should summation() do
with non-integer limits?
http://code.google.com/p/sympy/issues/detail?id=2723
To comment 7 and 8:
m_values is nice, if I want to use the list of possible spin states and do
something with. I could create a special sum just for spin states but I
hope that the general summation works exactly as mattpap described it in
(8):
summation(f(k), (k, a, b) as f(a) + f(a + 1) + ... + f(a + n) where n =
floor(b - a)
Intuitively I would expect this function to raise an error if (b-a) is not
an Integer or alternatively stop when (a + n) > b which is what
WolframAlpha does.
To 9: My original question was about the summation of -1/2, 1/2, 3/2,... so
definitely with a step of 1. I have seen other steps in very general
definitions like: S = sum over all f(x_i) with x_i where the individual x_i
are taken from the set G. Imho this is too general here.
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