The problem description is broken(?) and you have mentioned the code in the test suite (you might want to remove that)
The test suite has had the "solution" code removed. The description was also cleaned up. (If it's not loading, simply reload the page.) I'm not sure how much these fixes help, though...
Replace multiples of 5 with NaN
Basic arrays operations.
Return area of square
Array of Ones
Convert a Cell Array into an Array
remove nans fast
is the number happy?
Tony's trick for duplicating an mx1 vector n times
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