Calculate the number of nonzero rows

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muhammad muda
muhammad muda 2019-8-29
评论： muhammad muda 2019-8-29
Hi,
How can I calculate the number of nonzero rows in a matrix?
I have
B =
3 4
5 0
0 0
and the number of nonzero rows (that I need) is 2. (because the 2nd row has the element of '5')
I tried sum( all( B ~= 0, 2 ) ); but the answer is 1.

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采纳的回答

Stephen23
Stephen23 2019-8-29
>> nnz(any(B,2))
ans = 2

更多回答（1 个）

the cyclist
the cyclist 2019-8-29
编辑：the cyclist 2019-8-29
Use any instead of all. Your code is counting rows in which all entries are non-zero.

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