gathering data from each trading session of S&P futures going back one year

[johng964]

not sure if this is a strategy, but i would like to run a backtest in which i only print out data to a file. i want to capture data from each full trading session (from the 6pm open to the 5pm close the next day) of the S&P futures for one year. i don't know how to start running the strategy from 1 year ago and iterate one session at a time until today, saving data as i go along. Also, not sure where to put my method, OnBarUpdate() seems like overkill because i just need data on a per session basis. some pseudo code like the following:

public class SomeStrategy : Strategy
{
var List<MyData> data = new List<MyData>();

public void runIt()
{
for(var int i = 1; i < anArrayContainingEachTradingSessionForThePastYear. length; i++)
{
var someData = new MyData();
someData.priorClose = anArrayContainingEachTradingSessionForThePastYear[i-1].closePrice; // 5pm close prior session
someData.currentOpen = anArrayContainingEachTradingSessionForThePastYear[i].openPrice; // 6pm open current session
someData.currentLow = anArrayContainingEachTradingSessionForThePastYear[i].lowPrice; // low of current session

data.add(someData);
}

foreach (var d in data)
{
using (var fw = new FileWriter("c:\testdata.csv"))
{
fw.writeLine(d.priorClose + "," + d.currentOpen + "," + d.currentLow);
}
}
}
}

class MyData
{
public double priorClose {get;set;}
public double currentOpen {get;set;}
public double currentLow {get;set;}
}

i don't know how to fill anArrayContainingEachTradingSessionForThePastYear with data, then iterate through it. each index in the array contains a trading session. is it even possible?

thanks
john

[NinjaTrader_Jim]

Hello johng964,

Thanks for your post.

The strategy will backtest the historical data of the data series it is applied to. You could for example, load 1 years worth of data and run the strategy against it. Within the strategy's OnBarUpdate method, you could then check if Bars.IsFirstBarOfSession is true which would reflect when a new session is created. This could be where you decide to reset variables and output the information to file.

IsFirstBarOfSession - https://ninjatrader.com/support/help...rofsession.htm

Please let us know if we can be of further assistance.

[johng964]

thanks Jim, that did the trick