Return the number of days in a given month in 2017. If the input is not a valid month number, return -1.
Input: m = 1
Outpu: d = 31
Input: m = 2
Output: d = 28
Input: m = 13
Output: d = -1
You cannot use IF statements
Back to basics 7 - Equal NaNs
Matrix indexing with two vectors of indices
02 - Vector Variables 3
Volume of a box
Sum of Two Numbers
Separate even from odd numbers in a vector - without loops
Vertical matrix sort
Find the starting index of a consecutive condition
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