[Numpy-discussion] accumulation operation

Ralf Juengling Ralf.Juengling at synopsys.com
Wed Jan 22 12:23:35 EST 2014


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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