Comment #13 on issue 3128 by thilina....@gmail.com: Sum and Product
manipulations
http://code.google.com/p/sympy/issues/detail?id=3128
I would like to implement the reordering of the Sum/Products too ( I have
committed on this issue in pull request
https://github.com/sympy/sympy/pull/2081). Currently I think of a function
reorder() with an interface like below.
reorder(Sum(x*y, (x, a, b), (y, c, d)), x, y)
Sum(x*y, (y, c, d), (x, a, b)).
Generally this function will interchange the limits of the two additional
arguments
passed (here x and y).
As asmeurer has mentioned above, this will be tricky when limit variables
are related. But for the interface, is this a good method for reordering?
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