Read closed source indicator A values in indicator B

[z679Gju]

Hi,

I would like to build a new custom indicator based on another which is closed source. I have tried to follow https://forum.ninjatrader.com/forum/...ther-indicator and https://forum.ninjatrader.com/forum/...-are-not-plots but it seems I am doing something wrong, as I get errors either on the constructor:

​
private IndicatorClosed indicatorClosed = new IndicatorClosed("P1", "P2", 10);
'NinjaTrader.NinjaScript.Indicators.IndicatorClose d' does not contain a constructor that takes 3 arguments

The definition available to me for the closed source indicator is:

namespace NinjaTrader.NinjaScript.Indicators {
    public partial class Indicator : NinjaTrader.Gui.NinjaScript.IndicatorRenderBase {
        private IndicatorClosed[] cacheIndicatorClosed;

        public IndicatorClosed IndicatorClosed(string p1, string p2, string p3) {
            return IndicatorClosed(Input, p1, p2, p3);
        }

        public IndicatorClosed IndicatorClosed(ISeries<double> input, string p1, string p2, string p3) {
            // ...
        }
    }
}​

If I just do

​
private IndicatorClosed indicatorClosed;
...
indicatorClosed = IndicatorClosed("P1", "P2", 10);

It builds but then I get the runtime error:

​
Error on calling 'OnStateChange' method: Object reference not set to an instance of an object.

Do you know how I should instantiate the closed indicator so I can access the various data series generated by the closed indicator ?

Thanks in advance

[NinjaTrader_ChrisL]

Hello, thanks for writing in. The initialization should take place in OnStateChanged, in the DataLoaded state. For an example of how to initialize an indicator and where to place the code, see the "SampleMACrossover" strategy in the Strategies folder. You can also check Intellisense in the editor that will give you a parameter list. You can pull this up as soon as you type the opening '(' in your script e.g.

indicatorClosed = IndicatorClosed( <- after you type this, IntelliSense will show you a list of overloads.

Kind regards,
-ChrisL

[z679Gju]

Hi Chris,

Thanks for the prompt reply. I did not thought of the examples. Worked like a charm, thank you so much.

Have a good day,

Yoan