AFL NOT WORKING IN 5.50 AMIBROKER

_SECTION_BEGIN("Chart Settings");
	SetChartOptions(0,chartShowArrows|chartShowDates);
	SetChartBkColor(ParamColor("Outer Panel",colorPaleBlue)); 
	SetChartBkGradientFill(ParamColor("Upper Chart",1),ParamColor("Lower Chart",23));  
_SECTION_END();



_SECTION_BEGIN("BOŞ EKRAN");

Show_color = ParamToggle("Display CandleColor", "No|Yes", 1);
mycolor=IIf(C<Ref(C,-1) , ColorRGB(230,230,0),IIf(C>Ref(C,-1),ColorRGB(0,0,100),IIf(C==Ref(C,-1) ,colorOrange,colorDarkRed)));
mycolor1=IIf(C<Ref(C,-1),colorWhite,colorLime);


if(Show_color ==1)
{
ColorHighliter = myColor;
SetBarFillColor( ColorHighliter );

barColor=IIf(C>Ref(C,-1) ,colorAqua,IIf(C <Ref(C,-1),colorRed,colorYellow));
barColor2=IIf(Close > Open, colorWhite, colorRed);


PlotOHLC( Open, High, Low, Close, " " , barcolor, styleCandle | styleThick );
}
ColorHighliter = myColor1;
SetBarFillColor( ColorHighliter );

barColor3=IIf(C>Ref(C,-1),colorAqua,colorRed);
Plot(Close, " " , barColor3, styleBar | styleThick );

SEC2 =C;
D3 = Param("MA PERIOD BASE SECURITY", 13, 1, 1000,1);
D1 = Param("Regression Days", 500, 1, 2000,1);
D2 = Param("ROC Days", 11, 1, 100,1);
RS1 = ROC(C,D2);
RS2 = ROC(SEC2,D2);
b = Correlation(RS1,RS2,D1)*StDev(RS1,D1)/StDev(RS2,D1);
a = MA(RS1,D1)-b*MA(RS2,D1);
PR11 = b*RS2+a;
PRED1 = Ref(C,-D2)*(1+PR11/100);
PRED = MA(PRED1,D3);
Plot(PRED,"Predicted Value for Base Securtiy from LR on MA of ROC's",colorYellow,styleLine+styleDots|styleThick);


_SECTION_BEGIN("Infinite impulse response filter");

f0 = Param("F0 Katsayı :",0.2,-10,10,0.001);
f1 = Param("F1 Katsayı :",1.4,-10,10,0.001);
f2 = Param("F2 Katsayı :",-0.6,-10,10,0.001);

function IIR2( faktor, f0, f1, f2 )
{
  sonuc[ 0 ] = faktor[ 0 ];
  sonuc[ 1 ] = faktor[ 1 ]; 

  for( i = 2; i < BarCount; i++ )
  {
    sonuc[ i ] = f0 * faktor[ i ]  + f1 * sonuc[ i - 1 ] +  f2 * sonuc[ i - 2 ]; 
  }

  return sonuc;
}
Line=IIR2( Close, f0, f1, f2 );
Plot( Line, "IIR2", IIf(Line > Ref(Line, -1),colorLime,colorRed),styleLine+styleDots|styleThick);
_SECTION_END();

actually looks real good. THANKS..

what good…….! there is nothing on afl at first. where is the begin & end of the formula….! i found nothing…do u plz. help me.

picture plese !!!!!