Index outside of bounds error

[bobperez]

Hello, I have another related question. I'm trying to make a KAMA indicator that uses Range(4) bars as the secondary data series, so that it may be called by a strategy that uses any other type of bars.

I'm getting the "... index outside of bounds error". I've tried to see where the error originates by using prints, but I can't fix the issue.

    public class KAMASecondarySeries : Indicator
    {
        private Series<double>    diffSeries;
        private double            fastCF;
        private double            slowCF;
        private SUM                sum;

        protected override void OnStateChange()
        {
            if (State == State.SetDefaults)
            {
                Description                    = NinjaTrader.Custom.Resource.NinjaScriptIndicatorDescriptionKAMA;
                Name                        = NinjaTrader.Custom.Resource.NinjaScriptIndicatorNameKAMA;
                Fast                        = 2;
                IsSuspendedWhileInactive    = true;
                IsOverlay                    = true;
                Period                        = 10;
                Slow                        = 30;
                RangePeriod                 = 4;

                AddPlot(Brushes.DodgerBlue, NinjaTrader.Custom.Resource.NinjaScriptIndicatorNameKAMA);

            }
            else if (State == State.Configure)
            {
                AddDataSeries(BarsPeriodType.Range, RangePeriod);

                //fastCF        = 2.0 / (Fast + 1);
                //slowCF        = 2.0 / (Slow + 1);
            }
            else if (State == State.DataLoaded)
            {


                fastCF        = 2.0 / (Fast + 1);
                slowCF        = 2.0 / (Slow + 1);


                diffSeries = new Series<double>(this);
                sum = SUM(diffSeries, Period);
            }
        }

        protected override void OnBarUpdate()
        {

                    Print(Time[0]+" 1 ");

            if (CurrentBars[0] < RangePeriod && BarsInProgress== 0 )
                {
                    Value[0] = Input[0];

                    //Print(Time[0]+" Value[0] "+Value[0]);
                    Print(Time[0]+" 2 ");
                    return;
                }

                if (CurrentBars[1] < Period && BarsInProgress== 1)
                {
                    Value[0] = Input[0];
                    Print(Time[0]+" 3 ");

                    return;
                }
                    Print(Time[0]+" Value[0] "+Value[0]);
                    Print(Time[0]+" 4 ");


            if (BarsInProgress == 1 && CurrentBars[1] > Period)
            {
                double input0 = Input[0];
                diffSeries[0] = CurrentBar > 0 ? Math.Abs(input0 - Input[1]) : input0;


                double signal = Math.Abs(input0 - Input[Period]);
                double noise  = sum[0];

                Print(Time[0]+" signal "+signal);
                // Prevent div by zero
                if (noise == 0)
                {
                    Value[0] = Value[1];
                    return;
                }

                Print(Time[0]+" xValue[0] "+Value[0]);

             double value1   = Value[1];
            *** This Print #5 line does not print, suggesting the Value[1] is incorrect ***
             Print(Time[0]+" 5 ");

                Value[0]        = value1 + Math.Pow((signal / noise) * (fastCF - slowCF) + slowCF, 2) * (input0 - value1);
            }
            if (BarsInProgress == 0 && CurrentBars[0] > Period )
                Value[0] = Values[1][0];

        }

        #region Properties
        [Range(1, 125), NinjaScriptProperty]
        [Display(ResourceType = typeof(Custom.Resource), Name = "Fast", GroupName = "NinjaScriptParameters", Order = 0)]
        public int Fast
        { get; set; }

        [Range(5, int.MaxValue), NinjaScriptProperty]
        [Display(ResourceType = typeof(Custom.Resource), Name = "Period", GroupName = "NinjaScriptParameters", Order = 1)]
        public int Period
        { get; set; }

        [Range(1, 125), NinjaScriptProperty]
        [Display(ResourceType = typeof(Custom.Resource), Name = "Slow", GroupName = "NinjaScriptParameters", Order = 2)]
        public int Slow
        { get; set; }

        [Range(1, int.MaxValue), NinjaScriptProperty]
        [Display(ResourceType = typeof(Custom.Resource), Name = "RANGE Period", GroupName = "NinjaScriptParameters", Order = 3)]
        public int RangePeriod
        { get; set; }

        #end​

What am I doing wrong?

[NinjaTrader_ChrisL]

Hi Bob, thanks for posting. I moved your post to a new topic since its not related.

This is a good application of the powerful Visual Studio debugging technique. You can attach Visual Studio to the NinjaTrader process, run the code that is causing this exception then Visual Studio will break at the line of code where the exception is occurring. It's a very useful debugging technique that is used frequently to find run-time errors. See here for a guide on doing this:

https://ninjatrader.com/support/help..._studio_debugg ing.htm

This guide uses an older version of Visual Studio, but you can use the current version.

99% of the time, the "index outside of bounds error" in a script is from accessing a Series<T> index that does not yet exist.

Kind regards,

-ChrisL

[bobperez]

Hi Chris,

Thanks. I'll try that.

Bob