Calling 3rd Party indicators in a NinjaScript

[dmking]

I'm experimenting with some NS and ran into a problem. If I'm using a Moving Average in a Script, I can write

private SMA smaFast;

and there is no problem. But if I call a 3rd party MA and write"

private amaEHMA amaehmaFast

where amaEHMA is the Exponential HMA written by Harry, I get an error that says

'NinjaTrader.NinjaScript.Strategies.Strategy.amaEH MA(int)' is a 'method' but is used like a 'type'

So why can I call the SMA indicator with no problem, but get an error when I call amaEHMA?

TIA

[NinjaTrader_JoshG]

Hello dmking,
Thanks for your post

I would not expect an error from the snippet you provided. I expect this is the result of something else.

Can you show us where you are creating the indicator inside OnStateChange()?

[dmking]

Here ya go Josh:

   
public class LMACross : Strategy
    {
        ///private HMA hmaFast;
        private HMA hmaSlow;
        private amaEHMA amaehmaFast;

        protected override void OnStateChange()
        {
            if (State == State.SetDefaults)
            {
                Description    = NinjaTrader.Custom.Resource.NinjaScriptStrategyDescriptionSampleMACrossOver;
                Name           = "LMACross";
                Fast            = 8;
                Slow            = 21;
                //Adj            = 13;
                // This strategy has been designed to take advantage of performance gains in Strategy Analyzer optimizations
                // See the Help Guide for additional information
                IsInstantiatedOnEachOptimizationIteration = false;
            }
            else if (State == State.DataLoaded)
            {
                AMAehmaFast     = amaEHMA(Fast);                
                hmaSlow             = HMA(Slow);
                //hmaFast            = HMA(Fast);

                AMAehmaFast.Plots[0].Brush     = Brushes.Red;
                hmaSlow.Plots[0].Brush              = Brushes.Cyan;
                //AMAehmaAdj.Plots[0].Brush     = Brushes.Yellow;

                AddChartIndicator(AMAehmaFast);
                AddChartIndicator(hmaSlow);
//                AddChartIndicator(AMAehmaAdj);
            }
        }

[NinjaTrader_JoshG]

dmking,

It tough to say where exactly the error is occurring here, I do see an error in the spelling/casing of your amaEHMA:

You created the variable here

private amaEHMA amaehmaFast;

and then go to instantiate it here but it is not spelled correctly

AMAehmaFast     = amaEHMA(Fast)

it should look like this instead:

amaehmaFast= amaEHMA(Fast)

[dmking]

Thanks Josh, I fixed up the sloppy coding as you suggested, but that's doesn't appear to be where the problem lies. I looks like line 44:
private amaEHMA amaehmaFast; is the offending code. If I replace amaEHMA with SMA and replace amaehmaFast with SMAFast, the error goes away. Recall that amaEHMA is a 3rd party indicator and is not one of the core NT indicators. D

[bltdavid]

Whenever there is an error with a 3rd party indicator (esp with an indicator you paid for) you should always start your quest for support with that 3rd party.

Harry would clear this up in a heartbeat, I'm sure.

[Harry]

When you have any question regarding an "ama"-indicator, please contact me via private message or send a notice to LizardIndicators support.

If you wish to call the Exponential Hull Moving Average amaEHMA, you need to add a line to the "Using declarations":

"using NinjaTrader.NinjaScript.Indicators.LizardIndicators;"

That should fix the problem.

[dmking]

David,

Thanks for responding. Harry has reached out and his suggestion fixed everything.

D