Original LUA oscillator: viewtopic.php?f=17&t=1874.
Formulas:
K[i] = K[i-1]+(FastK[i]-K[i-1])/D_Slowing,
D[i] = D[i-1]+(K[i]-D[i-1])/D_Length, where
FastK[i] = 100*(Close[i]-Min)/(Max-Min),
Max, Min - Maximum and minimum prices at range from (i-K_Length+1) to (i).
Download: