[Numpy-discussion] Array accumulation in numpy
Tue Feb 19 09:00:25 CST 2013
I want to accumulate elements of a vector (x) to an array (f) based on
an index list (ind).
What I want would be produced by the loop
The answer is f=array([ 0., 7., 0., 6., 5., 0., 0., 0., 0., 3.])
When I try to use implicit arguments
I get f=array([ 0., 6., 0., 4., 5., 0., 0., 0., 0., 3.])
So it takes the last value of x that is pointed to by ind and adds it to
f, but its the wrong answer when there are repeats of the same entry in
ind (e.g. 3 or 1)
I realize my code is incorrect, but is there a way to make numpy
accumulate without using loops? I would have thought so but I cannot
find anything in the documentation.
Would much appreciate any help - probably a really simple question.
Chemical Engineering Department
University of Florida
Gainesville, Florida 32611-6005
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