Multi timeframes and multi instruments

[rgb_wins]

I am using NT7 in building an indicator. I want to compare moving average on a particular instrument across different time frames. I have it working but there is a problem that I need some help with.

I added the different time frames by using the Add()
Add (PeriodType.Minute, 5);
Add (PeriodType.Minute, 15);
Add (PeriodType.Minute, 60); etc

In the OnBarUpdate section

if (BarsInProgress == 0) // process only when the primary bar is updated
{

in this section I determine the SMA for each time frame using
Slope5 = SMA(BarsArray[1},18); // sma for the 5 minute
Slope15 = SMA(BarsArray[2},18); // sma for the 15 minute
Slope60 = SMA(BarsArray[3},18); // sma for the 60 minute
....
...
}

When I run this opening the chart in the 60 Minute period type it works fine. But when I try to load it in a lower time period, such as the 5 Minute, it doesn't work and give a message something like index not in range. I understand that the period type that you open a chart in becomes the primary and is index = 0 but if I open a chart in the lower time frame, how to I determine the SMA for the higher time frames.

Second part, say my primary instrument is the ES 06-11. In the same indicator above, how would I bring in and reference the ES ##-## (continuous contract) instrument to determine a moving average?

Thanks for any hints or help that you can provide.

Regards,

[NinjaTrader_RyanM1]

Hello rgb_wins,

You can use this statement generally to prevent NT from attempting to access invalid objects for multiple series scripts.

if (CurrentBar < 0 || CurrentBars[1] < 0)
return;

You may have to play with the values depending how your script is coded and add additional CurrentBars[ ] indexes to include all series.

You can add continuous contracts using Add() statements in Initialize() method. An example is:
Add("ES ##-##", PeriodType.Minute, 15);

http://www.ninjatrader.com/support/helpGuides/nt7/multi_time_frame__instruments.htm