On Tue, Feb 14, 2012 at 9:16 AM, Dag Sverre Seljebotn <d.s.seljeb...@astro.uio.no> wrote: > It was about the need for a dedicated matrix multiplication operator.
has anyone proposed that? I do think we've had a proposal on the table for generally more operators: i.e. like matlab's ".*" vs "*", and yes, matrix multiplication would be one use of that feature. > (The difference from the current > situation being that people avoid np.matrix because it's so similar to > np.ndarray that you too easily get confused). I'm not sure that's why -- I think it's because: a) np.matrix is really not quite finished - it's not full featured enough to be truly useful (maybe that's the same as you "similar to np.ndarray)" b) all it provides is syntax candy for matrix operations -- and how much of our code is matricx operations? a couple lines our of hundreds (that was always the case with my MATLAB code, and it even the more so now -- I can count my uses of np.dot on one hand...) > I myself never missed a matrix multiplication operator, precisely > because my matrices are very often diagonal or triangular or sparse or > something else, so having syntax candy simply to invoke np.dot wouldn't > help me. exactly -- so that could address point (a), but I still think in most code it's only going to amke a small fraction of teh code more readable. -Chris PS: the notable exception is instructional code involving matrix arithmetic -- it would be nice there, and that is where I've seen the strongest requests for it. -- Christopher Barker, Ph.D. Oceanographer Emergency Response Division NOAA/NOS/OR&R (206) 526-6959 voice 7600 Sand Point Way NE (206) 526-6329 fax Seattle, WA 98115 (206) 526-6317 main reception chris.bar...@noaa.gov _______________________________________________ NumPy-Discussion mailing list NumPy-Discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion
