Given an input variable x, output a variable y that is equal in value to x.
Input x = 1
Output y is 1
Input x = 5
Output y is 5
Not as simple as it seems.
Find all elements less than 0 or greater than 10 and replace them with NaN
Check if sorted
Back to basics 15 - classes
Return unique values without sorting
Change the sign of even index entries of the reversed vector
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