Exponentially-weighted moving average (Ewma) solved using iteration. Given scalar ‘alpha’ (between 0 and 1) and vector ‘X’, this template solves for L, such that:

L(t) = (alpha*X) + (1-alpha)*L(t-1) L(1) = X(1)

It solves this by looping through all the cases and appending the results.

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