Suggestions for a non-zero counter

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Andy
Andy 2011 年 12 月 9 日
I have a 16000X271 matrix, and its mostly zeros, with maybe 1000 non-zero numbers. I need to find out how many non-zero elements there are. The way i can think of is going through every variable and check if it is a zero or not, but that would be very inefficient, is there a faster way? Thanks

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Sean de Wolski
Sean de Wolski 2011 年 12 月 9 日
well
how about nnz (number non-zeros)!
doc nnz;
or
sum(sum(logical(A));
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Andy
Andy 2011 年 12 月 9 日
works thanks :D

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