On Wed, 2014-01-22 at 17:23 +0000, Ralf Juengling wrote: > 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? > >
Since you have addition, you should use np.bincount - Sebastian > > Thanks, > Ralf > > > _______________________________________________ > NumPy-Discussion mailing list > NumPy-Discussion@scipy.org > http://mail.scipy.org/mailman/listinfo/numpy-discussion _______________________________________________ NumPy-Discussion mailing list NumPy-Discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion
