Entry Exit Magic Arrows AFL - Amibroker AFL Code

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_SECTION_BEGIN(""); 

a = Param("Angle",30,15,45,1);
pd = Param("Period",5,4,6,1);
P = ParamField("Price field",3);

a= (22/7)*(a/180);
Num = 0;
Den = 0;

for(i=1; i<=pd; i++)
{
if(pd%2==0 AND i > pd/2) X = sin((i-1)*a);
else X = sin(i*a);

Num = Num + X*Ref(P,1-i);
Den = Den + X;
}

if (den!=0) j1 = Num / Den;

Plot(j1,"j1",IIf(j1 > Ref(j1,-1),colorGreen,colorRed),styleThick);

Buy = Close > j1;
Sell = Close < j1;
Buy=ExRem(Buy,Sell); Sell=ExRem(Sell,Buy); 
PlotShapes( shapeHollowUpArrow* Buy , colorBlue ,0);
PlotShapes( shapeHollowDownArrow* Sell, colorYellow ,0);
//Plot(0,"",colorDarkBlue,styleLine);

Filter = Buy OR Sell;
Buy=ExRem(Buy,Sell); Sell=ExRem(Sell,Buy); 
AddTextColumn(FullName(),"Name");
AddColumn( Buy, "BUY" );
AddColumn( Sell, "SELL" );


_SECTION_END();