MATLAB: Counting the number of non-zero or zero elements in a specific direction of an array

arrayMATLABmatrix array

Hello there,

I have an 8x3x5 array, and would like to count its number of zeros and non-zeros across its 3rd dimension. In particular, I would like to get a 1×5 vectors that gives me the number of zero elements, and another 1×5 vectors showing the number of ones. I would appreciate if somebody can help me. Thanks.

Best Answer

This seems to work:

NZ  = sum(squeeze(sum(M==0,1)));    % Zero Elements
NNz = sum(squeeze(sum(M~=0,1)));    % Non-Zero Elements

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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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