PeriodType && BarsArray

[marubozu79]

hello everyone and congratulations for the excellent support.
after days that I'm breaking my head to solve a problem I decided to play the help from home.

I'm developing an indicator Nt7 that works on the 30min time frame and I need to develop some calculations using the LinReg calculated on the closing of the previous day but on the 1 DAY time frame.

I stated this in the Initialize:

protected override void Initialize()
{
Add(PeriodType.Day, 1); //dataseries1
}


& this in the OnBarUpdate:

protected override void OnBarUpdate()
{
if (CurrentBars[1]==0&&BarsPeriod.Id == PeriodType.Day && BarsPeriod.Value >= 21)
{
double LinRegValue = LinReg(BarsArray[1], 18)[0];
}
}


But this code with the start of the market replay continues to generate errors of this type:
Error on calling 'OnBarUpdate' method for indicator 'IndicatorsLinReg' on bar 0: You are accessing an index with a value that is invalid since its out of range. I.E. accessing a series [barsAgo] with a value of 5 when there are only 4 bars on the chart.

thanks for a support
Chris

[NinjaTrader_Jim]

Hello Chris,

Thanks for your inquiry.

In your code, you are referencing your daily data series before a daily bar is built.

As we can see from the error, on bar 0, we hit an indexing error. In your code we see a reference to the daily series when that daily series is on bar 0. Since LinReg() has a period of 18, you will need 18 bars of daily data for the indicator to work without error.

When debugging, I recommend to place prints to see how far you code gets before you hit an error. Once you identify a problematic line, the next step would be to identify any issues with the way that line is written.

I've included some development tips for debugging and making sure you have enough bars for the data series you are referencing.

Debugging - https://ninjatrader.com/support/foru...ead.php?t=3418

Making sure you have enough bars - https://ninjatrader.com/support/foru...ead.php?t=3170

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

[marubozu79]

good morning,
I thought a lot and added debub with the print function.
I think I have come to the conclusion that I have a problem with OnBarUpdate ().

protected override void OnBarUpdate()
{
Print("CurrentDay step A : " + CurrentDay);
if (BarsInProgress == 1)
{Print("stop0 " + CurrentBar + " " + ToTime(Time[0])+ " "+ CurrentDay);
return;
}
if (BarsInProgress == 1&&BarsInProgress == 0)
{Print("@@ OK @@ " + CurrentBar + " " + ToTime(Time[0])+ " "+ CurrentDay);
}
if (CurrentBar <1)
{Print("stop1 " + CurrentBar + " " + ToTime(Time[0])+ " "+ CurrentDay);
return;
}
if (CurrentBars[1] <1)
{Print("stop2 " + CurrentBar + " " + ToTime(Time[0])+ " "+ CurrentDay);
return;
}


the code above excludes the logic on the BarsArray [1] so that OnBarUpdate () works only on the primary data set.

However, I believe that at 8:00 am when the OnBarUpdate () of both the 30-minute candle and the 1D candle occurs, the logic stops the call also on the 30-minute bar of the BarsArray [0].
This happens to me in the market replay.

this is the log of the debug that just shows that onbarupdate does not intervene to the formation of the bar at H 8.00. (I also attach a screen) :

CurrentDay step A : 20180223
190000 CurrentBar: 973 CurrentBar[1]: 50 Open : 12480,5 state:FirstMorningBar day :20180223
CurrentDay step A : 20180223
193000 CurrentBar: 974 CurrentBar[1]: 50 Open : 12484,5 state:FirstMorningBar day :20180223
CurrentDay step A : 20180223
200000 CurrentBar: 975 CurrentBar[1]: 50 Open : 12487,5 state:FirstMorningBar day :20180223
CurrentDay step A : 20180223
203000 CurrentBar: 976 CurrentBar[1]: 50 Open : 12496 state:FirstMorningBar day :20180223
CurrentDay step A : 20180223
210000 CurrentBar: 977 CurrentBar[1]: 50 Open : 12493 state:FirstMorningBar day :20180223
CurrentDay step A : 20180223
213000 CurrentBar: 978 CurrentBar[1]: 50 Open : 12511,5 state:FirstMorningBar day :20180223
CurrentDay step A : 20180223
GlobalProfit 0
220000 CurrentBar: 979 CurrentBar[1]: 51 Open : 12528 state:FirstMorningBar day :20180223
CurrentDay step A : 20180223
stop0 51 220000 20180223

thanks for the precious support.

[NinjaTrader_Jim]

Hello

Thanks for your reply.

I am not entirely clear on the issue you are now encountering.

I see that you skip out of all operations after your print on BarsInProgress 1 and you also have a condition that checks if current iterating bar is BarsInProgress 1 and BarsInProgress 0. This second condition cannot be true.

without the full context of the code and further detail on the issue you are hitting I cannot provide much further input.

Considering the noted programming issues, I may suggest reviewing the Multi Time Frame and Instruments documentation while debugging your code as it provides a complete guide for creating and using Multi Series NinjaScripts. I will provide a link below.

Multi Series NinjaScripts (Important read!) - https://ninjatrader.com/support/help...nstruments.htm

After reviewing this material, please let us know if you are still encountering issues and please provide any further description of what you expect to see so we can be of additional help.