Hi All,
Lets say I am using the 1 minute time frame chart. I now create an indicator in which I want to load 5 years of daily data (I guess using AddDataSeries) to perform some calculations. I can see that there is an API function:

AddDataSeries(string instrumentName, BarsPeriod barsPeriod, int barsToLoad, string tradingHoursName, bool? isResetOnNewTradingDay)

Is this the correct function to use? What do I set barsPeriod to? Would it be the daily value in minutes i.e. 1440 (24X60 minutes)? Also what do the tradingHoursName and isResetOnNewTradingDay parameters get set to?

Thanks,
iq

Try a simple:
AddDataSeries(Data.BarsPeriodType.Day, 1);

In your case you don't need one of the other AddDataSeries() methods as there are only required if you want to add another dataserie for another instrument.

Thanks Sam. One question - how does Ninjatrader know how much data to load? If my primary intraday data series is set to 1 minute and 2 days of data, will Ninjatrader only try to load 2 days of daily data? How can I tell it to load say 5 years rather than 10 years ?

I assume it's loading the amount of data related to your primary dataserie.

But this means that if I want to build support and resistance from 5 years of daily data I need to load 5 years of 1 minute data (primary data series). This is why I was asking my original question in my first post. The point was to be able to use 2-3 days of 1 minute data for the primary series and load more daily data for my indicator.

In this case you may use another technique, something like this (not tested):

Thanks Sam.

You can also check GetDayBar(), this might be a smarter solution.