Retrieve values in the past of the graph

[jodu49]

Hello,

I need to retrieve values in the past.
In OnBarUpdate() I get an index error. I can only recover at index 0. How can I work around this problem please? I specify that I really need to do this with a strategy because I have to check certain prices in the past to trigger a trade.

Thanks for your help

[NinjaTrader_Jesse]

Hello jodu49,

A simple way to figure out the problem is to use the error information to see when this happened. Was the error on bar -1 or 0 or later in processing on a much higher number?

Generally you need a condition placed before the code where you check past data, that condition is to stop at that point if there is not that many bars processed yet. If you are on bar 0 you can only check 0 BarsAgo because you are at the very first datapoint being processed.

Once the script has processed X bars you could look back X bars ago as shown below using 5. You could change that 5 to reflect whatever value you had used.

if(CurrentBar < 5) return; 
Print(Close[5]);