Given the vector A, return B in which all numbers in A are doubling. So for:
A = [ 1 5 8 ]
B = [ 1 1 5 5 8 8 ]
Find relatively common elements in matrix rows
Extract leading non-zero digit
Read a column of numbers and interpolate missing data
Vectorize the digits of an Integer
Divisors of an integer
Solving a quadratic equation
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