How to assign dataseries to indicator

[saturntd]

I'm trying to assign a dataseries to an indicator, but not able to do it in the way I want to. Please see below code snippets inside of an indicator:
public class xx : Indicator
{
SMA jk_sma;

protected override void Initialize()
{
jk_sma = new SMA();
}
protected override void OnStartUp()
{
jk_sma.Input=BarsArray[0];
}
protected override void OnBarUpdate()
{
//** Indicator is unusuable, not getting any data
if(BarsArray[0].CurrentBar>100)
Print(String.Format("{0}",jk_sma.Value[0]));

}}...

How can I assign the dataseries properly? I know I can use SMA simply as SMA(x).Value[0] but I need to do it the way I've described for other reasons.

Thanks.

[NinjaTrader_RyanM]

Hi saturntd,

Thanks for the post. Sorry, it is not clear what you're trying to do. Can you please offer a brief English description and we'll have a better idea?

[saturntd]

Hi Ryan,
I just want to be able to instantiate a new instance of an indicator class & assign a dataseries to it for that indicator to use in it's calculations.
This is going on inside of another new indicator I'm writing, or could also be inside of a strategy.

Thanks.

[NinjaTrader_RyanM]

I see -- you can remove the Initialize() line and do something like this in OnStartup()

// Declaring an object type variable using a Simple Moving Average indicator
SMA mySMA = new SMA(Close, 20);

Access its current values with mySMA[0].

[saturntd]

Ryan,
I can't get it to work that way, just get compile error: does not contain a constructor that takes 2 arguments.
Is there a way to see the # of arg's for the constructor? Call the constructor directly?

Thanks.

[NinjaTrader_Bertrand]

You should be able to see parameters required in Intellisense, just type the method followed by the left brace to see it pop up and what's expected for a compile.

[koganam]

Originally Posted by NinjaTrader_RyanM

I see -- you can remove the Initialize() line and do something like this in OnStartUp()

// Declaring an object type variable using a Simple Moving Average indicator
SMA mySMA = new SMA(Close, 20);

Access its current values with mySMA[0].

That will not work from OnStartup(); you will have a scope issue.

You have to declare the SMA variable as a class variable.
Then you can assign/instantiate it in either Initialize() or OnStartUp().

Because it was defined as a object type (a named instance of the class), you assign it without the "new" keyword.

private SMA yada_sma;

protected override void OnStartUp()
{
yada_SMA = SMA(Close, 5);
//etc;
}

protected override void OnBarUpdate()
{
//here is where you use your named instance;
}