NT8 IsValidDataPoint causes Exception when used on Indicator Plot

[rayko]

Hello,

I defined an indicator using the Wizard and it produced the following code:

AddPlot(Brushes.Transparent, "TwTOP");
AddPlot(Brushes.Transparent, "TwBOT");
AddPlot(Brushes.Transparent, "TwRiskDlr");
AddPlot(new Stroke(Brushes.OrangeRed, 2), PlotStyle.Dot, "TwStopLoss");

I also defined these Series<T>

upTrend = new Series<bool>(this, MaximumBarsLookBack.Infinite);
twDlyTrendCnt = new Series<double>(this, MaximumBarsLookBack.Infinite);
twTrendBarCnt = new Series<double>(this, MaximumBarsLookBack.Infinite);
twBarColor = new Series<string>(this, MaximumBarsLookBack.Infinite);

The indicator works fine, but when I try to test for IsValidDataPoint(0) in OnBarUpdate, on both the Plots and Series<T> from within a Strategy, the statements that reference the Plots fail with exception....

IsValidDataPoint cannot be used on a series running with MaximumBarsLookBack.TwoHundredFiftySix

What I`m trying to do is.. convert a strategy from NT7 to NT8 using NT8.0.0.8 64bit.

In NT7 the code is:
if (!AuLbTradeWindow(false, false, false, false, dblDollarSL, 50).twTOP.ContainsValue(0)) { Print("twTOP has no value @Time=" + Time[0].ToString()); }

In NT8 I rewrote to be:
if (!AuLbTradeWindow(false, false, false, false, 50, DblDollarSL).TwTOP.IsValidDataPoint(0)) { Print("twTOP has no value @Time=" + Time[0].ToString()); bolError = true; }

I understood from the documentation that plots should be checked for valid values.

Should the definition of the indicator plots be defined differently to allow a strategy to check IsValidDataPoint ?

Could you please let me know what I may have done wrong here OR is this something not quite right with NT8.0.0.8 ?

Thank you

[NinjaTrader_PaulH]

Hello rayko,

Thanks for your post.

We would expect that error, "MaximumBarsLookBack.TwoHundredFiftySix" when it is set that way, the code you are showing says it is set to MaximumBarsLookBack.Infinite.

Please post your complete code if possible. If you prefer to keep it private, feel free to send in to PlatformSupport[at]NinjaTrader[dot]Com In the subject line place Atten:Paul and a link to this thread.

[rayko]

Hello Paul,

I put together an example of how it produces an error so that you can test it at your end.

I`ve uploaded an NT8 export of MyIndicator and MyStrategy and screen print of the error showing on the NT log.

Please let me know.

[NinjaTrader_PatrickH]

Hello rayko,

Thank you for your patience.

In your indicator, you would also need to define MaximumBarsLookBack. For example:

			if (State == State.SetDefaults)
			{
				Description							= @"Enter the description for your new custom Indicator here.";
				Name								= "MyIndicator";
				Calculate							= Calculate.OnBarClose;
				IsOverlay							= true;
				DisplayInDataBox					= true;
				DrawOnPricePanel					= true;
				DrawHorizontalGridLines				= true;
				DrawVerticalGridLines				= true;
				PaintPriceMarkers					= true;
				ScaleJustification					= NinjaTrader.Gui.Chart.ScaleJustification.Right;
				//Disable this property if your indicator requires custom values that cumulate with each new market data event. 
				//See Help Guide for additional information.
				IsSuspendedWhileInactive			= true;
				[B]MaximumBarsLookBack					= MaximumBarsLookBack.Infinite;[/B]

                AddPlot(Brushes.Transparent, "TwTOP");
                AddPlot(Brushes.Transparent, "TwBOT");
                AddPlot(Brushes.Transparent, "TwRiskDlr");
                AddPlot(new Stroke(Brushes.OrangeRed, 4), PlotStyle.Dot, "TwStopLoss");
            }