This one should work for all of the test cases except that you have some numerical precision issues with the last test case. Please replace it with a numerical comparison that takes into account precision (my code is returning numbers with no decimal point but the test code returns something less pretty).
Is my wife right? Now with even more wrong husband
Determine Whether an array is empty
Getting the indices from a vector
Remove from a 2-D matrix all the rows that contain at least one element less than or equal to 4
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