Given an input vector containing a cosine wave of unknown frequency, produce an output vector of the same length containing a cosine wave of twice the input frequency. The output should have the same mean and amplitude as the input.
Clever use of acos(). I didn't think to do that.
Return the 'Size' of a String of Code
Generate a vector like 1,2,2,3,3,3,4,4,4,4
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