This problem was fun. I was able to find a better way to solve beat my own solution. Not the best way though. But lot better.
@Alireza yarmohammadi: your comment was deleted as it revealed an answer to the problem.
In response to the question you asked, though, your function returns m, which is not the complete answer. The last line in your function displays the correct result, but assigns it to ans, not m.
Find the numeric mean of the prime numbers in a matrix.
Find the sum of the elements in the "second" diagonal
Reverse the elements of an array
Draw a 'X'!
Sum of series V
Sum of series I
Sum of series II
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