IsValidDataPoint and MaximumBarsLookBack256

[Steve L]

This help documentation says:

Warning: Calling IsValidDataPoint() will only work a MaximumBarsLookBackInfinite series. Attempting to check IsValidDataPoint() MaximumBarsLookBack256 series throw an error.

Meanwhile this forum page provides some examples which work for me in NinjaTrader 8 even when the indicators are set to MaximumBarsLookBack256.

Specifically SampleEveryNBarTest contains this code:

        protected override void OnBarUpdate()
        {
            /* Checks to see if the current bar has a valid indicator plot value set on indicator plot: Value. It is important to check this to know if the values you are
             using are relevant or not. Using irrelevant values for your script logic can cause inaccurate calculations and trade signals. */
            if(!SampleEveryNBar(N).Value.IsValidDataPoint(0))
            {
                // SampleEveryNBar does not have a valid indicator plot value. Set hosting indicator's plot to zero and paint the bar red.
                BarBrushes[0] = Brushes.Red;
                PlotBrushes[0][0] = Brushes.Red;
                Value[0]= 0;
            }
            else
            {
                // SampleEveryNBar does have a valid indicator plot value. Set hosting indicator's plot to this value and paint the bar blue.
                BarBrushes[0] = Brushes.Blue;
                PlotBrushes[0][0] = Brushes.Blue;
                double val = SampleEveryNBar(N).Value[0];
                Value[0] = val;
            }
        }

And when I added to my chart, I used MaximumBarsLookBack256:



Can you help clarify whether the documentation is wrong or misleading on this? Or specifically under what circumstances the maximum lookback becomes a problem?

Thanks,
Steve

[NinjaTrader_ChelseaB]

Hello Steve L,

The example provided does not use a secondary data series or have any custom series.

The primary series will always be MaximumBarsLookBack.Infinite and this is not possible to change.

If a secondary series is added, that series must be Infinite to use IsValidDataPoint().

https://ninjatrader.com/support/helpGuides/nt8/en-us/maximumbarslookback.htm