Momentum indicator

Algos, strategies, code
1

Hi How to code for momentum in AFL. Could not find any indicator for the same Please guide

2

Momentum Indicator

_SECTION_BEGIN("Triple Momentum Indicator");

SetBarsRequired(100000,0);

GraphXSpace = 15;

SetChartOptions(0,chartShowArrows|chartShowDates);

SetChartBkColor(ParamColor("bkcolor",ColorRGB(0,0, 0)));

GfxSetBkMode(0); 

GfxSetOverlayMode(1);

SetBarFillColor(IIf(C>O,ParamColor("Candle UP Color", colorGreen),IIf(C<=O,ParamColor("Candle Down Color", colorRed),colorLightGrey)));

//Plot(C,"\nPrice",IIf(C>O,ParamColor("Wick UP Color", colorDarkGreen),IIf(C<=O,ParamColor("Wick Down Color", colorDarkRed),colorLightGrey)),64,0,0,0,0);

x = ROC (C, 5);
y = ROC (C, 15);
z = ROC (C, 25);

A = x + y + z;

Plot (A, "Triple Momentum", colorRed);

Plot (4, "", colorGreen, styleNoLabel, styleDashed);
Plot (-1, "", colorRed, styleNoLabel, styleDashed);

Buy = Cross (A,4);
Sell = Cross (4,A);
Filter = Buy OR Sell;

AddColumn( Buy, "Buy", 1);
AddColumn(Sell, "Sell", 1);
AddColumn(Close,"Close",1.2);
AddColumn(Volume,"Volume",1.0);

_SECTION_END();