Usage of indicator within another indicator

[Leope]

Hello,
I developed an indicator "X" . I want to use the developed indicator "X" within another indicator "Y".
I would like to access internal variables of "X" or variables that are plotted by "X [using Addplot].
What I did is within "Y" :
X newX = X(in0,in1) ;
double tmp0 = newX. var0 ; // var0 is an AddPlot of "X"
I get an error CS1061.
My understanding from this is that I need to define "var0" differently.
What is needed to be done in both X and Y indicators ?
I tried looking for documentation but couldn't find any .
Thanks

[NinjaTrader_ChrisL]

Hello Leope,

Thank you for the post.

If var0 is a plot, you must have a series set up in your indicator to return the respective Values[] array.

For example, look at the code of the MACD indicator, which has multiple plots. There is a custom series set up for each plot it has. Those series' get method returns the corresponding Values[][] array of the plot.

In State.SetDefaults:

AddPlot(Brushes.Crimson,NinjaTrader.Custom.Resource.NinjaScriptIndicatorAvg);

Then a custom series is set up to alias that series:

#region Properties
[Browsable(false)]
[XmlIgnore]
public Series<double> Avg
{
	get { return Values[1]; }
}

Then you would access that series from your indicator like so:

double val = MACD(5,9,12).Avg[0];

Notice that you do not need to reference the first index because the getter does that for you.

Please let us know if we may be of any further assistance.

[Leope]

Hi Chris,
Thanks for your quick reply ! Your support is outstanding !
I changed my indicator according to your answer, and now it compiles ok.
But when I try to run it (on a chart), I get the following message:
"A hosted indicator tried to load additional data. All data must first be loaded by the hosting Ninjascript in its configure state"
What does this mean and what is still missing ?
Thanks !!

[NinjaTrader_ChrisL]

Hello Leope,

Thank you for the follow-up.

Kindly see this post regarding the same item. My colleague's answer is in post #2.

https://ninjatrader.com/support/forum/showthread.php?t=95371&page=3

If you have an indicator that calls AddDataSeries() you must have a duplicate call to AddDataSeries() in the script which is using that indicator.

Please see the section "Prevention of Redundant Data Loading" on this page:

https://ninjatrader.com/support/helpGuides/nt8/en-us/?code_breaking_changes.htm#ImplementationChangesOverview

Please let me know if I may be of any further assistance.