Best Practice question: Indicators for multi series:

[Kicks.Spin]

Dear Ninjas:

I see two different ways to get indicator values for a multiseries scrip. Which is preferable? Which works better for backttesting? any up or downside? Both ways are summarized below

This gets correct number for ADX for 2nd dataseries
public class mymultiseriesindi : Indicator
{
private ADX myADX;
}
else if (State == State.DataLoaded)
{
myADX = ADX(Closes[1], ADXPeriod); //instantiated ADX for 2nd dataseries
}

But this also works
ADX(BarsArray[1],ADXPeriod)[0] // BarsArray[1] also works

upside or downside comments?

[NinjaTrader_Jesse]

Hello Kicks.Spin,

Both uses would be valid, there should not be a downside to using either. Closes[1] specifies the close series for that BarsInProgress and BarsArray would get the bar series for that BarsInProgress. Both uses will have the same result for most indicator uses. If an indicator is programmed to use input it can utilize any series you pass to it like that. If the indicator is programmed in a way which passing an input does not work, for example the indicator explicitly references a series that was not passed with the input, then you would instead use the indicator from the BarsInProgress index to get a value:

if(BarsInProgress == 1)
{
    myADXValue = ADX(ADXPeriod)[0]; 
}

Please let me know if I may be of further assistance.