Hi, is it possible to count the number of ones in a matrix ?

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nafila aytija
nafila aytija 2016-4-8
评论： Walter Roberson 2021-6-21
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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Ahmet Cecen
Ahmet Cecen 2016-4-8
编辑：Ahmet Cecen 2016-4-8
sum(A(:) == 1);
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Walter Roberson
Walter Roberson 2021-6-21
Ran in:
A = randi([0 1], 5, 5); A = xor(A,A.'); %random symmetric
A
A = 5×5 logical array
0 0 0 1 1 0 0 0 0 1 0 0 0 0 1 1 0 0 0 0 1 1 1 0 0
[r,c] = find(A);
mask = r>=c;
r = r(mask); c = c(mask);
[r,c]
ans = 4×2
4 1 5 1 5 2 5 3
or
[r,c] = find(tril(A))
r = 4×1
4 5 5 5
c = 4×1
1 1 2 3

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