MATLAB: Calculate the number of nonzero rows

nonzero rows

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.

Best Answer

>> nnz(any(B,2))
ans = 2

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Try eye(), any(), and find():

A=[1,0,0,0;0,1,1,1;0,0,1,0;0,0,1,1]
diagonalElements = logical(eye(length(A)))
% Make copy of A so we don't change 
% the original A (which could be bad).
Acopy = A;
% Set diagonal elements = 0.
Acopy(diagonalElements) = 0
rowsWith1s = find(any(Acopy, 2))

Best Answer

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MATLAB: Count the number of non-zero elements of a column/row of a 2D-Matrix

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