The sum of positive elements of a matrix

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merowing3
merowing3 2018-9-18
评论： Christopher Wallace 2021-1-14
Let M be a matrix with dimensions mxn. Calculate the sum of all positive elements of matrix M without using loop.
My code:
sum(M>0) % sum of all positive elements in respective column, we get vector with sum for each column
sum(sum(M>0)) % sum of all sums from vector
Correct or not?

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Christopher Wallace
sum(sum(M(M > 0)))

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Mohamed Hossam
Mohamed Hossam 2021-1-14
is there a certain command that gets the sum of postive even numbers of an array?

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