Accessing Indicator from a Strategy

[greenhollow803]

Hi,

My indicator uses Volumetric data. I set Range as period type.

I added the Indicator in the strategy. How do i set/configure to take the data series as Volumetric and Range values to an Indicator added in the Startegy when I call it ?

Below code snippet is from my indicator and I am getting Bartype is null error when i run the strategy with AddChartIndicator method. Can you please help me how to set the data series to an Indicator which called from a Strategy?

barsType = BarsArray[0].BarsType as NinjaTrader.NinjaScript.BarsTypes.VolumetricBarsTy pe;
if (barsType == null){
Print("barsType is null: " + CurrentBars[0]);
return;
}

[NinjaTrader_ChelseaB]

Hello greenhollow803,

Is the chart set to use Volumetric bars (primary bars)?

If so, both the strategy and the indicator would have access to the bars.

Attached is a test script that prints the volumetric bar info from a strategy and from a hosted indicator.
VolumetricHostTest_NT8.zip

Did you add a volumetric series with AddVolumetric()?

If so, use BarsArray[1] instead of BarsArray[0].

[greenhollow803]

Thank you for queick response and for sharing the example.

I am using Volumetric as primary. Not via via AddDataSeries.

You used as a class variable instead of using the AddChartIndicator.

So I tried similar way but I got the below error. How can I fix this?

BSKBot2.cs	'NinjaTrader.NinjaScript.Strategies.Strategy.BSKSi gnal2(bool, int, bool, int, bool, bool, bool, int, int, double, int, int, int, int, double, long, long, long, long, int, int, int, int, int, int, bool, bool, bool, bool, bool)' is a 'method' but is used like a 'type'	CS0118	32	12

[NinjaTrader_ChelseaB]

Hello greenhollow803,

Are you calling the indicator as an indicator method?

Or are you attempting to use the 'new' keyword?

Is the indicator extending the Indicator class?

The example I provided has a working hosted indicator that is called by the strategy.

[greenhollow803]

I exactly followed the below example.

https://ninjatrader.com/support/helpGuides/nt8/NT%20HelpGuide%20English.html?onbarupdate.htm

Added the indicator as shown below

if (State == State.DataLoaded)
{
AddChartIndicator(BSKSignal3());
}

When I try to compile then got the below error.

BSKBot2.cs	No overload for method 'BSKSignal3' takes 0 arguments	CS1501	329	25

[NinjaTrader_ChelseaB]

Hello greenhollow803,

The custom indicator appears to have parameters that need to be supplied for the overload signature.

There also may be an issue with the indicator itself.

Are you certain this is an indicator?

[greenhollow803]

Yes. I developed myself and working well on the chart showing the signals. As of now I am copying the code to separate strategy to test various settings for multiple days.

Instead of that I would like to just call the indicator so that I no need to duplicate my efforts.

Are there any specific config information you want me to share related to my indicator.

[greenhollow803]

I added all the input parameters as shown to the Indicator then from startegy it got triggered successfully. However failed to recognise the Volumetric Bar.

AddChartIndicator(BSKSignal2(false,10,false,5,true ,false,false,2,1,1000,6,6,20,10,100,10,10,10,1000, 299,299,40,2,3,5,false,false,true,true,false));


In indicatgor it exactly failed at the below code and printed null. So it was not able to pick the Volumetric series which is primary for both Indicator and Startegy. I can change it to secondary by adding as data series in Indicator. Will it cause any performance issues ?

barsType = BarsArray[0].BarsType as NinjaTrader.NinjaScript.BarsTypes.VolumetricBarsTy pe;
if (barsType == null){
Print("barsType is null: " + CurrentBars[0]);
return;
}

[NinjaTrader_ChelseaB]

Hello greenhollow803,

The public variables (inputs) using NinjaScriptProperty you have added to the indicator will become overload parameters which must be supplied to the method call.

For example the MACD has 3 inputs: a fast, slow, and smooth input.
MACD(int fast, int slow, int smooth)
Calling this would appear as MACD(12, 26, 9)

Place the cursor in-between the parenthesis and press Ctrl + spacebar and the intelliprompt will appear and show the overload signature.

[greenhollow803]

After cleaning up all unnecessary input parameters it worked now. Thanks for all your help