[amibroker] Help with old code from DT

["goldwing01_1999" <goldwing01_1999@xxxxxxxxx>]

function IIR2( input, f0, f1, f2 )
{
  result[ 0 ] = input[ 0 ];
  result[ 1 ] = input[ 1 ];//<---- getting error
  for( i = 2; i < BarCount; i++ )
  {
    result[ i ] = f0 * input[ i ] + 
    f1 * result[ i - 1 ] + 
    f2 * result[ i - 2 ]; 
  }
  return result;
}
C1=Foreign("^VIX","C");C1=C;
RED=IIR2( C1, 0.2, 1.4, -0.6 );
k=0.6;// Optimize("k",0.6,0.1,2,0.1);
LINE=IIR2(C1,0.2-0.01*K,1.4+0.01*K,-0.6);
Buy=Cross(LINE,RED);
Sell=Cross(RED,LINE);
E1=Equity(1,0);dd=40;MA1=MA(E1,dd);
tb=100*Cum(E1<MA(E1,dd))/Cum(1);
Filter=1;
AddColumn(E1,"E1");
AddColumn(tb,"tb %");






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