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?
The Goldbach Conjecture
First N Perfect Squares
Find the sum of the elements in the "second" diagonal
Output any real number that is neither positive nor negative
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