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 ]
Replace NaNs with the number that appears to its left in the row.
Derivative of polynomial
2倍してみよう - ここからスタート！
Tick. Tock. Tick. Tock. Tick. Tock. Tick. Tock. Tick. Tock.
Solving a quadratic equation
Divisors of an integer
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