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 23 - Triangular matrix
middleAsColumn: Return all but first and last element as a column vector
Symmetry of vector
04 - Scalar Equations 2
Find the average of a random sequance
Approximate the cosine function
Find the starting index of a consecutive condition
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