On Thu, May 23, 2013 at 11:14 AM, Nathaniel Smith <n...@pobox.com> wrote: > On Thu, May 23, 2013 at 3:57 PM, Matthieu Brucher > <matthieu.bruc...@gmail.com> wrote: >> In my point of view, you should never use an output argument equal to an >> input argument. It can impede a lot of optimizations. > > This is a fine philosophy in some cases, but a non-starter in others. > Python doesn't have optimizations in the first place, and in-place > operations are often critical for managing memory usage. '+=' is an > important operator, and in numpy it's just 'np.add(a, b, out=a)' under > the hood.
Isn't dot handled by Lapack, and whatever optimized version is available? Josef > > On Thu, May 23, 2013 at 3:50 PM, Nicolas Rougier > <nicolas.roug...@inria.fr> wrote: >> Also, from a user point of view it is difficult to sort out which functions >> currently allow 'out=a' or out=b' since nothing in the 'dot' documentation >> warned me about such problem. > > That's because AFAIK all functions allow out=a and out=b, except for > those which contain bugs :-). > > Can you file a bug in the bug tracker so this won't get lost? > > -n > _______________________________________________ > 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
