Given a polynomial equation coefficients in a vector p, you have to return its value at x.
For inputs p and x
p = [1 0 1]
x = [1 4]
Output y is [1*1^2 + 1, 1*4^2 + 1] or
y = [2 17]
Convert a vector into a number
Given a matrix, return the last eigen value
Number of digits in an integer
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