expsmooth(src: number, factor: number; init: number) 🡒 number, process

The process expsmooth offers an exponential smoothing method.

table T[t] = extend.range(100)
T.X = random.normal(10.0 into T, 5.0)

T.Smooth = expsmooth(T.X, 0.1; 0) scan t

show plot "" a1d4 with T.N, T.X, T.Smooth

Annex: implementation

The expsmooth process could be manually re-implemented as:

def process expsmooth_bis(src: number, factor: number; init: number) default 0 with
    keep prev = init
    prev = factor * src + (1 - factor) * prev
    return prev
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