On Sun, Sep 28, 2008 at 4:15 PM, Geoffrey Irving <[EMAIL PROTECTED]> wrote: > > Thanks. That works great. A slightly cleaner version is > > X += coo_matrix((Y, (K, zeros_like(K)))).sum(axis=1) > > The next question is: is there a similar way that generalizes to the > case where X is n by 3 and Y is m by 3 (besides the obvious loop over > range(3), that is)? >
You could flatten the arrays and make a single matrix that implemented the operation. I'd stick with the loop over range(3) though, it's more readable and likely to be as fast or faster than flattening the arrays yourself. -- Nathan Bell [EMAIL PROTECTED] http://graphics.cs.uiuc.edu/~wnbell/ _______________________________________________ Numpy-discussion mailing list Numpy-discussion@scipy.org http://projects.scipy.org/mailman/listinfo/numpy-discussion
