Normalizing of Ninja Trader Indicators

[jebemtimamu]

Hello,
I am currently trying to Normalize the Linear Regression Intercept Indicator. I have created a custom Indicator and used the Script Editor however, I keep getting a blank Plot. Any help would be appreciated. I am trying to get it to plot "NormLinRegINtercept". Thank you.

protected override void OnBarUpdate()
{
double ba = LinRegIntercept(20)[0];
double bb = MIN(LinRegIntercept(20),256)[0];
double bc = MAX(LinRegIntercept(20),256)[0];
var bd = bc-bb;
double NormLinRegIntercept = (ba-bb)/bd;
NormLinRegIntercept = new Series<double>(NormLinRegIntercept);
}

[ntbone]

These lines of code are confusing and should not compile.

// you are assigning a value to a double.  Its also a local variable so it will definitely not show up in a plot.
double NormLinRegIntercept = (ba-bb)/bd;  

// now you are reassigning it a new type. I am surprised this compiles.  If it does it might mean that you
// also have a property or member variable of type Series<double>.  You are creating a new series with
// every bar update with this line.  This series doesn't accept  a double as a parameter so both
// NormLinRegIntercept must be referring to some other property or member variable outside the scope
// of OnBarUpdate that is of type Series<double>
NormLinRegIntercept = new Series<double>(NormLinRegIntercept);

In the configure state of OnStateChange() you need to call AddPlot, if a call isn't already there. Its common pattern to then have a property for the indicator as follows

[Browsable(false)] // Makes sure it doens't show up in the properties window
[XmlIngore] // Makes sure it doesn't get saved
public Series<double> NormLinRegIntercept
{
    get { return Values[0]; }
}

This code may already exist in your class if you generated it from the editor in NinjaTrader.

Finally your code should look like this

protected override void OnBarUpdate()
{
    var ba = LinRegIntercept(20)[0];
    var bb = MIN(LinRegIntercept(20),256)[0];
    var bc = MAX(LinRegIntercept(20),256)[0];

    var denominator = bc - bb;
    if(denominator != 0)
    {
        NormLinRegIntercept[0] = (ba - bb)/denominator;
    }
    else
    {
         // best value (or no value) for when its 0
    }
}

[eDanny]

Finally your code should look like this

protected override void OnBarUpdate()
{
double ba = LinRegIntercept(20)[0];
double bb = MIN(LinRegIntercept(20),256)[0];
double bc = MAX(LinRegIntercept(20),256)[0];
NormLinRegIntercept[0] = (ba - bb)/bd;
}

I assume you mean:

protected override void OnBarUpdate()
{
double ba = LinRegIntercept(20)[0];
double bb = MIN(LinRegIntercept(20),256)[0];
double bc = MAX(LinRegIntercept(20),256)[0];
double bd = bc-bb;
NormLinRegIntercept[0] = (ba - bb)/bd;
}

or omit the red line and instead:

NormLinRegIntercept[0] = (ba - bb)/(bc-bb);

[ntbone]

Oops. Yes, I revised my post due to missing the line.