[Numpy-discussion] dot() performance depends on data?

Hagen Fürstenau hagen@zhuliguan....
Fri Sep 10 12:36:11 CDT 2010


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

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