Perhaps the ndarrays have different ordering (C vs Fortran order)? On Fri, Sep 10, 2010 at 10:36 AM, Hagen Fürstenau <[email protected]>wrote:
> Hi, > > I'm multiplying two 1000x1000 arrays with numpy.dot() and seeing > significant performance differences depending on the data. It seems to > take much longer on matrices with many zeros than on random ones. I > don't know much about optimized MM implementations, but is this normal > behavior for some reason? > > Cheers, > Hagen > > > _______________________________________________ > NumPy-Discussion mailing list > [email protected] > http://mail.scipy.org/mailman/listinfo/numpy-discussion > >
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