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Ingy döt Net 2023-07-01 11:58:00 -04:00
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Task/Averages-Simple-moving-average/Mercury/averages-simple-moving-average.mercury Normal file
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% state(period, list of floats from [newest, ..., oldest])
:- type state ---> state(int, list(float)).
:- func init(int) = state.
init(Period) = state(Period, []).
:- pred sma(float::in, float::out, state::in, state::out) is det.
sma(N, Average, state(P, L0), state(P, L)) :-
take_upto(P, [N|L0], L),
Average = foldl((+), L, 0.0) / float(length(L)).