Problem! Spread..

[Fernand0]

Hey! Me! Yes! Your nightmare in the virtual flesh!

Ok, so, i'm storing every event from DOM(1&2)

Whenever i want to get the entire ladder, I can, of course, just go back to old events... and rebuild the ladder.

Now.. the problem comes up when the market makes 1 or more ticks of spread (example: NQ makes 1 tick of spread sometimes)
The method that reconstructs the ladder, doesn't know this because is based in data from previous events.

So, how do i get, let's say the "GetCurrentAsk()" and "GetCurrentBid()" inside of an AddOn? (without dependance of the calling file)
I save the Instrument when I instance the main class. I don't know if i can access from there.


I'm open to new ideas.

One idea, would be to get both 0 Position...

double pos0 = Data.First(p => p.Position == 0);
double Ask0 = Data.First(p => p.Position == 0 && p.MarketDataType == MarketDataType.Ask && p.Time <= pos0.Time);
double Bid0 = Data.First(p => p.Position == 0 && p.MarketDataType == MarketDataType.Bid && p.Time <= pos0.Time);

if (Ask0.Price - TickSize != Bid0.Price)
    // we have spread

The problem is that consumes more resources.. and is a mess... if i can get it much cleaner would be awesome


My regards.
Fernando.

[NinjaTrader_AlanP]

Hello Fernand0,

Thank you for your note.

So I may best answer your question would you please provide detail on what you mean by the following?

when the market makes 1 or more ticks of spread (example: NQ makes 1 tick of spread sometimes)

The following link to the helpguide provides an example of how you could pull the last price from an Addon,

https://ninjatrader.com/support/helpGuides/nt8/en-us/?marketdata.htm

I look forward to your reply.

[Fernand0]

Hey Alan!

I mean the difference between the Ask price and the Bid price... like in the img that i uploaded

The MarketDataEventArgs.Ask and MarketDataEventArgs.Bid can work... on every call to register the changes.. i can check the difference.. and save it apart as "Spread".. and then check it in the reconstruction of the ladder to "avoid the spread price"

Thanks for the idea, is much cleaner and less expensive in resources

[Fernand0]

Alan, can you check this out?

For some reason MarketDataEventArgs Ask, returns a negative value...


My Regards.

[Fernand0]

I can solve it with..

args.Instrument.MarketDepth.Asks[0].Price
args.Instrument.MarketDepth.Bids[0].Price

But, why there is a negative value on MarketDataEventArgs.Ask and MarketDataEventArgs.Bid when there is spread?

Sounds like a bug to me, it should return the values without a problem...

So that's the problem, when there is spread, both values turn negative, god knows why...
I didn't test it in other instrument than NQ, i leave that to you.

[NinjaTrader_AlanP]

Hello Fernand0,

Who is your data provider?

I look forward to your reply.

[Fernand0]

CQG, Sim account

[NinjaTrader_PatrickH]

Hello Fernand0,

Thank you for your response.

To be clear, you are properly calling the MarketDepth Update as detailed in the Help Guide document linked below?

• https://ninjatrader.com/support/help...arketdepth.htm

If so, then why wouldn't the following work?

		private double askPrice = 0;
		private double bidPrice = 0;
		private void OnMarketDepth(object sender, MarketDepthEventArgs e)
		{
			if (e.Position == 0 && e.MarketDataType == MarketDataType.Ask)
				askPrice = e.Price;
			if (e.Position == 0 && e.MarketDataType == MarketDataType.Bid)
				bidPrice = e.Price;
			
			if (Math.Abs(askPrice - bidPrice) > 1 * TickSize)
				Print("*** THIS IS A SPREAD LARGER THAN 1 TICK ***");
			Print("Ask: " + askPrice);
			Print("Bid: " + bidPrice);
			Print("Diff: " + (Math.Abs(askPrice - bidPrice)));
		}

I may not understand the full scope of what you are attempting here. Please let me know if there is more to this than simply checking the difference between the Ask and Bid Price at the most recent updates at the Position of 0.

Please let me know if you have any questions.

[Fernand0]

Hi Patrick, your approach is correct... but I'm not using Depth, I'm using Data... I'll show you a simple code....

protected override void OnMarketData(MarketDataEventArgs args)
		{
			
			Print("Ask: " + args.Ask);
			Print("Bid: " + args.Bid);
			
		}

I'm not even in the AddOn.. i tested IN the AddOn.. and i saw troubles.... so i went back to the Indicator

MarketDataEventArgs shows the parameters "Ask" and "Bid" to be accessible all the time. I noticed when a Spread shows up, the price goes negative sometimes.
It's just what i saw, i couldn't confirm it.

BTW. Thanks for your time and patience