Forecasting Crossover Trading System - Amibroker AFL Code

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a=EMA(C,3);
b=EMA(C,13);
d=EMA(C,34);
d=a*.5;
e=b*.1429;
f=(Ref(b,-1)*(1-.1429)-Ref(a,-1)*(1-.5))/(.5-.1429);

Plot(C,"close", colorBlack,styleLine);
Plot(EMA(C,3),"3ema",colorRed,styleLine);
Plot(EMA(C,13),"13ema",colorBlue,styleLine);
Plot(EMA(C,200),"200ema",colorGreen,styleLine);

Plot(f,"BP or SP",colorWhite,styleLine); //BP Buying or Selling point
Plot (b,"stop Loss",colorBrown,styleDots);


Buy=Cross(a,b) ;

Sell=Cross(b,a) ;


PlotShapes(IIf
(Buy,shapeUpArrow,shapeNone) ,colorBrightGreen,0,Graph0,-15);

PlotShapes(IIf(Sell,shapeDownArrow,shapeNone),colorRed,0,Graph1,-15);
Title="\\c55"
+Name()
+" " + WriteVal(C)+" "+Date()+" "+"\\c44"+"3ema"+WriteVal(a)
+" "+"\\c33"+" "+"BP or SP"+WriteVal(f)+" "+"\\c33"+" "+"stop
loss"+WriteVal(b);