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added prev, alpha init and samples() to EMA

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Ahmet Inan 2019-02-24 19:42:54 +01:00
commit 65383970a7
1 changed files with 5 additions and 1 deletions
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6
ema.hh
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@ -22,13 +22,17 @@ class EMA
return x-VALUE(1)+sqrt(x*(x-VALUE(4))+VALUE(3));
}
public:
EMA() : prev(0), alpha(1)
constexpr EMA(TYPE prev = TYPE(0), VALUE alpha = VALUE(1)) : prev(prev), alpha(alpha)
{
}
void cutoff(int n, int N)
{
alpha = cutoff_alpha(n, N);
}
void samples(int s)
{
alpha = VALUE(1) / VALUE(s);
}
TYPE operator()(TYPE input)
{
return prev = lerp(alpha, prev, input);