Accessing previous days bars

[jeddah62]

I am trying to calc the average of the last 20 days 1-min bars excluding todays RT data. I'm not interested in displaying this avg, just need it for further calcs. Here is my code snippet.

// if first bar of today's session, calc last 20 days average
if(Bars.FirstBarOfSession)
{
int barsCounted = 0;
for(int i = CurrentBar-1; i>=0; i--)
{
nDaysAvg += ((High[i] + Low[i] + Close[i]) / 3);
barsCounted++;
}
nDaysAvg = nDaysAvg / barsCounted;
}

My Questions:
1) Am I iterating the Bars collection backwards correctly
2) What is the best way to determine if I've processed 20 days. Currently, I'm creating a chart for 20 days and stopping when no more bars (i == 0).
3) Since I am only interested in displaying only todays 1min bars, how can I retrieve the last 20 days 1min bars used to calc the avg without having to display their bars.

thx

[NinjaTrader_JoshP]

Your style should be fine at a glance over. You will not be able to process past 20 days without loading 20 days onto the chart.

You could detect if you have processed 20 bars by using GetBar() and passing in a DateTime of market open of 20 days ago. Then you will have the number of bars ago to use instead of CurrentBar - 1.

[jeddah62]

Thanks Josh,

just to clarify, I used CurrentBar-1 to get the "last" bar of yesterdays session, then Iterate backwards for 20 days starting from this "last" bar. Is this the correct way to get this last bar?

I like the GetBar() idea. The only issue is how to calculate the date for 20 previous "trading" days to pass into GetBar()

Also, is this the only developer guide available for NT

http://www.ninjatrader-support.com/HelpGuideV6/helpguide.html?

[NinjaTrader_JoshP]

That is where you can find the language reference. For examples and such please see the reference samples section of the forums.

Calculating 20 days would be up to you. You can try some DateTime manipulations. Check the DayOfWeek and then do the math to get you 20 trading days from there. Then create your DateTime to have the proper date.

[jeddah62]

will do, thanks