Goldwing,
   
  I have version 4.70.5. I get no errors running this code. Here's the output from Explore:
   
    --
  Terry
   
  -----Original Message-----
From: amibroker@xxxxxxxxxxxxxxx [mailto:amibroker@xxxxxxxxxxxxxxx] On Behalf Of goldwing01_1999
Sent: Monday, November 28, 2005 04:40
To: amibroker@xxxxxxxxxxxxxxx
Subject: [amibroker] Help with old code from DT
   
  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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