Create a WMA of a custom slope indicator

[herbnderby]

I created an indicator that calculates / plots the slope of the HMA called HMAslope. I would like to calculate and plot the WMA of the HMAslope. Do I need to define the HMAslope as a series before I can use it in the WMA function? I have attached my code for the HMAslope custom indicator.

[NinjaTrader_ChrisL]

Hello herbnderby, thanks for writing in.

You are assigning the Slope value to the Value array which is already a Series<double> object, so you can use that series in the WMA e.g.

Value[0] = Slope(HMA(Period), StartBarsAgo, EndBarsAgo);
double myValue = WMA(Value, 20)[0];

Kind regards,
-ChrisL

[herbnderby]

I added that line of code. How do I plot this WMA on the same plot as the HMAslope?

[NinjaTrader_ChrisL]

Hi herbnderby, thanks for your reply.

You will need to call AddPlot() one more time, then access the second plot, e.g.

Value[0][0] = Slope(HMA(Period), StartBarsAgo, EndBarsAgo); //first plot
Values[1][0] = WMA(Value, Period)[0]; //second plot


Best regards,
-ChrisL

[herbnderby]

Okay, I modified my code as shown above but I received the error message "Cannot apply indexing with [] to an expression of type "double".

So I modified the code to this:

Values[0][0] = Slope(HMA(PeriodHMA), 1, 0); //first plot
Values[1][0] = WMA(Values[0], PeriodWMA)[0]; //second plot

I don't get any errors after compiling but the indicator still doesn't plot anything.

[NinjaTrader_ChrisL]

Hi herbnderby,

I added a CurrentBar check at the top to ensure there are enough bars to process and all the plots show up:

protected override void OnBarUpdate()
{
    if(CurrentBar < 20) return;

    Values[0][0] = Slope(HMA(20), 1, 0); //first plot

    Values[1][0] = WMA(Values[0], 20)[0]; //second plot
}

Best regards,
-ChrisL

[herbnderby]

This has solved the issue. Thank you ChrisL, I appreciate it.