Bars.GetDayBar - how to know I have enough data

[onnb1]

hi, I am using the GetDayBar method. When the study loads, as the bars are being calculated, I get an "On Bar Update Error". I am guessing it is because I am referencing the Close values where GetDayBar is not returning an object because there is no 1 data one day back.

this is my code:

double previousDayClose = Bars.GetDayBar(1).Close;

How do I know that I have data to access the previous day bar? Can someone please share some code?

thanks,
Onn

[NinjaTrader_JC]

Hello onnb1,
Correct, this error is because in OnBarUpdate() is trying to access the data series that does not have enough data to calculate. More information about making sure you have enough data can be found at the following link.

http://www.ninjatrader.com/support/forum/showthread.php?t=3170

This can be fixed by adding in a check to make sure we have enough data for the calculations in "OnBarUpdate()". Example:

protected override void OnBarUpdate()
{
	//Checks to make sure that there is a value for GetDayBar(1) before calculating
if (Bars.GetDayBar(1) != null)
{
	double previousDayClose = Bars.GetDayBar(1).Close;
}
}

Here is a link to our help guide that goes over GetDayBar() that you may read.

http://www.ninjatrader.com/support/helpGuides/nt7/index.html?getdaybar.htm

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