Cross Buy Oscillator Perfect Signals - Amibroker AFL Code

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_SECTION_BEGIN("B");


x=Param(" Average 1",10,2,32);
y=Param(" Average 2",5,3,12);
erg=(EMA(EMA(C-O,x),y)/EMA(EMA(H-L,x),y))*100;
Sg=EMA(erg,10);
Plot (erg,"Cross Buy Oscillator ",colorBrightGreen,styleThick);
Plot (Sg,"Signal",colorRed,styleThick);
Plot(0,"",colorWhite,styleDashed);
Buy=  ERG > SG;
Sell= SG  > ERG;
Buy=ExRem(Buy,Sell); Sell=ExRem(Sell,Buy); 
PlotShapes( shapeUpArrow* Buy , colorBrightGreen ,0);
PlotShapes( shapeDownArrow* Sell, colorRed ,0);
GraphXSpace=10; 
Filter = Buy OR Sell;
Buy=ExRem(Buy,Sell); Sell=ExRem(Sell,Buy); 
AddTextColumn(FullName(),"Name");
AddColumn( Buy, "BUY" );
AddColumn( Sell, "SELL" );
_SECTION_END();