Hi, is it possible to count the number of ones in a matrix ?
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nafila aytija
on 8 Apr 2016
Commented: Walter Roberson
on 21 Jun 2021
Example: Suppose we a have a matrix A=[1 0 0 1 0 0; 1 0 0 0 1 1]; how do I count the number of ones in this matrix??
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Accepted Answer
Ahmet Cecen
on 8 Apr 2016
Edited: Ahmet Cecen
on 8 Apr 2016
sum(A(:) == 1);
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Walter Roberson
on 21 Jun 2021
A = randi([0 1], 5, 5); A = xor(A,A.'); %random symmetric
A
[r,c] = find(A);
mask = r>=c;
r = r(mask); c = c(mask);
[r,c]
or
[r,c] = find(tril(A))
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