Supported Feature?

[ScottB]

Hi,

Is this code supported; it works but I cannot find any documentation on it and I always try to avoid undocumented features where possible?

IBar bar = Bars.Get(20);

I need the timestamp of a given bar during a backtest where I only know a bar number, nothing else.

If this isn't documented or there is a better way to do it, please let me know.

Best Regards,
Scott

[NinjaTrader_Matthew]

Hello Scott,

I'm not sure about Bars.Get(20) unless you mean Bars.GetBar(20)

Yes, this is a supported method of retrieving that information.

Bars.GetBar(20) will give you the Bar Number, while just using GetBar(20) will give you the BarsAgo value.

Please see our Forum Post on Referencing the correct bar for more examples and other methods:

http://www.ninjatrader.com/support/forum/showthread.php?t=4769

[ScottB]

Matthew, thanks for getting back to me.

I need information about the N bar; the same information I could get if I wrote something like

if (CurrentBar == 100) Time, etc. Since this is in a back test, all the information is already known. Bars.Count will give you the number of bars on the chart. I want the equivalent of Bars[150] (however it would be coded) to give me information about the absolute 150th bar on the chart, not 150 bars ago from my current position.

This code is in OnStartUp so CurrentBar will likely be something like BarsRequired. I hope this is clear.

The code I posted does work but since you are not familiar with it, I am guessing it isn't supported.

Best Regards,
Scott

[NinjaTrader_Matthew]

Scott,

No, that would not be supported.

Can you clarify why you cannot use Time[20]; to get the value?

[ScottB]

Matthew,

Thanks; I guessed as much. Wouldn't Time[20] give me the time from 20 bars ago? I want Time[101] to give me the time from BarNumber 101.

[NinjaTrader_Matthew]

Scott,

Gotcha - in that case, you'd use something like the following:

if(CurrentBar == 20)
   {
   DateTime myDateTime = Time[0];
   }

[ScottB]

Matthew,

That is the conclusion I came to but given I am willing to take the chance a future release will cause an issue, the other method I posted does work.

Best Regards,
Scott

[Baruch]

I guessed as much. Wouldn't Time[20] give me the time from 20 bars ago? I want Time[101] to give me the time from BarNumber 101.

Lets see. If we are on bar nr. 141, then Time[101] will give the time of bar 141-101=40.
Now you want the time of bar 101. How can you manipulate the equation to get it? Very complicated question. Need advise of a PhD. Mathematician.

[ScottB]

Baruch, I am not your man then.

The issue is I want this in OnStartUp for optimizations. In a back test or an optimization (which is kind of technically only a bunch of back tests) I already have all the bars (Bars.Count or maybe Bars.Count -1 I forget) is the last bar on the chart and will give the last bar your back test is over.

I just want to get the dates associated with various bars in between without having to wait for an iteration (or a back test). I got it to work, I just wasn't sure if it was supported or not.

Best Regards,
Scott

[koganam]

Matthew,

Thanks; I guessed as much. Wouldn't Time[20] give me the time from 20 bars ago? I want Time[101] to give me the time from BarNumber 101.

 
Time[CurrentBar - 101];

or whatever the barIndex that you want to deal with instead of "101"

[ScottB]

koganam, I have used that as well.