The sum of positive elements of a matrix

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?

Answer 1

[Christopher Wallace]

sum(sum(M(M > 0)))

Answer 2

[Mohamed Hossam]

is there a certain command that gets the sum of postive even numbers of an array?

[Christopher Wallace]

sum(M((M > 0) & (mod(M, 2) == 0)))