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 ]
surface of a spherical planet
Omit columns averages from a matrix
Output any real number that is neither positive nor negative
Generate a random matrix A of (1,-1)
Solving a quadratic equation
Divisors of an integer
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