[Numpy-discussion] counting non-zero entries in an ndarray

Ian Stokes-Rees ijstokes at hkl.hms.harvard.edu
Wed Dec 22 09:16:17 EST 2010

What is the most efficient way to do the Matlab equivalent of nnz(M)
(nnz = number-of-non-zeros function)?

I've tried Google, but no luck.

My assumption is that something like

a != 0

will be used, but I'm not sure then how to "count" the number of "True"


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