Executing the following code, >>> import numpy as np >>> a = np.zeros((3,)) >>> w = np.array([0, 1, 0, 1, 2]) >>> v = np.array([10.0, 1, 10.0, 2, 9]) >>> a[w] += v
I was expecting 'a' to be array([20., 3., 9.]. Instead I get >>> a array([ 10., 2., 9.]) This with numpy version 1.6.1. Is there another way to do the accumulation I want? Thanks, Ralf
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