In my point of view, you should never use an output argument equal to an input argument. It can impede a lot of optimizations.
Matthieu 2013/5/23 Nicolas Rougier <nicolas.roug...@inria.fr> > > > > > Sure, that's clearly what's going on, but numpy shouldn't let you > > silently shoot yourself in the foot like that. Re-using input as > > output is a very common operation, and usually supported fine. > > Probably we should silently make a copy of any input(s) that overlap > > with the output? For high-dimensional dot, buffering temprary > > subspaces would still be more memory efficient than anything users > > could reasonably accomplish by hand. > > > > 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. > > > Nicolas > > > > _______________________________________________ > NumPy-Discussion mailing list > NumPy-Discussion@scipy.org > http://mail.scipy.org/mailman/listinfo/numpy-discussion > -- Information System Engineer, Ph.D. Blog: http://matt.eifelle.com LinkedIn: http://www.linkedin.com/in/matthieubrucher Music band: http://liliejay.com/
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