You really need to supply more test cases if you want to go far in software engineering...
This is just lame, and without a proper test case.
Terrible test set.
Find all elements less than 0 or greater than 10 and replace them with NaN
Back to basics 9 - Indexed References
Back to basics 23 - Triangular matrix
matrix of natural number
Get the length of a given vector
Rotate a Matrix
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