Sum of certain value in a matrix

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EMIRA SYAMIMI AHMAD SUBRI
评论： Andrei Bobrov 2017-5-3
I have a 241 x 340 matrix that contains only 1 and 0 value scattered over the matrix. My question is how can I calculate the sum value of 1 in the matrix? Thank You in advance. for example
A = [0 0 0 0 1 1 1 1 0 0 1 1 1 0; 1 1 1 0 0 1 1 1 0 0 0 1 1 0]

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采纳的回答

Andrei Bobrov
Andrei Bobrov 2017-5-3
out = sum(A(:))

更多回答（2 个）

KL
KL 2017-5-3
编辑：KL 2017-5-3
See Image Analyst's answer here
A = [0 0 0 0 1 1 1 1 0 0 1 1 1 0; 1 1 1 0 0 1 1 1 0 0 0 1 1 0]
edges = unique(A)
counts = histc(A(:), edges)
Aniruddha Katre
Aniruddha Katre 2017-5-3
See the documentation for nnz: http://www.mathworks.com/help/matlab/ref/nnz.html

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