Add(Instrument.Fullname... - How to Remove?

[DionysusToast]

Hi

I have some code where I want to use 1 tick historical data but when I get to real-time data, I don't need it.

So - in the initialize section, I do the following:

Add(Instrument.FullName, PeriodType.Tick, 1, MarketDataType.Last);


Now, at some point, I'd like to kill the feed. It's obviously slowing things down for me.


So - can I "Remove" the instrument?


Cheers


Pete

[NinjaTrader_RyanM1]

Hi Pete,

There's unfortunately no way to remove the added series at run time. Best you could do is prevent processing on any of the added bar objects with something like:

if (!Historical && BarsInProgress == 1) return;

[DionysusToast]

Thanks Ryan

I have that in there - it seems to be the actual feed itself that's slowing things down.

If I am already using a 40 tick chart, would adding this feed for the same instrument cause any additional load? Would it download the data in a separate feed for instance?

Cheers

Pete

[daytradeblogger]

same issue here....

[DionysusToast]

same issue here....

Same performance issue?

It's quite drastic on my machine - and this is a speedy i7...

[NinjaTrader_RyanM1]

It will not be a separate data stream but once it's been added, it will be loaded into memory. It should be a comparable resource hit to creating a 1 tick chart. I'd be happy to take a look at your trace file to see if there are other things that may be contributing to performance here. Please send to my attention at support 'at' ninjatrader 'dot' com.

You will find the trace file in the Documents > NinjaTrader 7 > Trace folder.
The trace file will be named "trace.YYYYMMDD.txt"

[bukkan]

use the static NinjaTrader.Data.Bars.GetBars(....)

use it in OnStartUp, do the calculations from those bars and dispose it. for the rest of the tick based calculations do it in OnMarketData or whatever.

[DionysusToast]

Bukkan - I'll give that a go - many thanks!

[DionysusToast]

It will not be a separate data stream but once it's been added, it will be loaded into memory. It should be a comparable resource hit to creating a 1 tick chart. I'd be happy to take a look at your trace file to see if there are other things that may be contributing to performance here. Please send to my attention at support 'at' ninjatrader 'dot' com.

You will find the trace file in the Documents > NinjaTrader 7 > Trace folder.
The trace file will be named "trace.YYYYMMDD.txt"

Will do - just as soon as I get a live market again...

[DionysusToast]

Bukkan

As this is an undocumented feature - any ideas on how to use that method to get all the 1 tick bars since the current session opened?

BTW - All I'm trying to do here is build up a volume profile - trades @ each price level.

Thanks

Pete

[bukkan]

it will be something like this

Bars bars = NinjaTrader.Data.Bars.GetBars(Instrument,new Period(PeriodType.Tick,1,MarketDataType.Last), DateTime.Now.AddDays(-7),DateTime.Now,BarsArray[0].Session,false,false); //will get tick data for the last 7 days
                
if (bars != null && bars.Count > 0)
{
//do your stuff
}

since you are pulling tickdata "days to load" is a thing you should consider and use judiciously.

I used the session as used in the primary bar.

i did some stuffs on VP using this, but since i was building my stuff for the Indian markets and where the data is not as huge as ES etc i revert back to the multi instrument stuff. otherwise the above code worked fine for vp.

[DionysusToast]

Bukkan

Many thanks for that but I'm still not sure how to access the actual bars...

Here's what I tried.

			Bars myBars = NinjaTrader.Data.Bars.GetBars(Instrument,new Period(PeriodType.Tick,1,MarketDataType.Last), DateTime.Now.AddDays(-1),DateTime.Now,BarsArray[0].Session,false,false); //will get tick data for the last 7 days
			for (ii = 0; ii < myBars.Count; ii++);
			{
				if (myBars[ii].FirstBarOfSession == true)
				{	
					// Reset the array
					Array.Clear(volumeProfile,0,4000);
					// get the tick size
					tickSize = Instrument.MasterInstrument.TickSize;	
					tickMult = 1 / tickSize;
					startPrice = myBars[ii].Close - (2000 * tickSize);				
				}		
				int myRow = Convert.ToInt16((myBars.Close[ii] - startPrice) * tickMult);
				if (myRow >= 0 && myRow <= 4000)
				{
					volumeProfile[myRow] +=   myBars[ii].Volume;
				}
			}

Basically, I tried to use myBars as a list and page through the list. Hence the myBars[]ii] stiff. That doesn't appear to work.

So - how do I actually access the bar data once the series is added?

Many thanks

Pete

[DionysusToast]

It will not be a separate data stream but once it's been added, it will be loaded into memory. It should be a comparable resource hit to creating a 1 tick chart. I'd be happy to take a look at your trace file to see if there are other things that may be contributing to performance here. Please send to my attention at support 'at' ninjatrader 'dot' com.

You will find the trace file in the Documents > NinjaTrader 7 > Trace folder.
The trace file will be named "trace.YYYYMMDD.txt"

The problem is Ryan, that once the new data stream is added, even though it's the same instrument, both data series trigger the onMarketData & onMarketDepth events.

From what I can see there is no way to tell onMarketData or onMarketDepth to ignore one of the price series.

So - this is where the performance hit comes in for me.

Pete

[bukkan]

for (int i = 0; i < bars.Count; i++)
{
     if (bars.Get(i).FirstBarOfSession)
                     Print(bars.GetClose(i);
}

[DionysusToast]

Bukkan

Fantastic - works great.

Many thanks

Pete