P(n) = 1^2 + 2^2 + ... + n^2
P(1) = 1
P(2) = 1 + 4 = 5;
P(3) = 5 + 9 = 14;
P(4) = 14 + 16 = 30;
Return the first and last character of a string
Find the index of the largest value in any vector X=[4,3,4,5,9,12,0,4.....5]
Length of a short side
Element by element multiplication of two vectors
Generate this matrix
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