I would suggest trying not to give away a solution within the test suite.
wouldn't be better to remove TestSuite's case6:the empty matrix? it make arrayfun more suitable.
simple and nice!
The problem description is a little misleading in stating that the input will contain positive, non-zero integers. Why include an empty array in the test suite?
Find the numeric mean of the prime numbers in a matrix.
Duplicate each element of a vector.
Determine if input is a perfect number
Sum of diagonals elements of a matrix
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