Double arrow @ CrossAbv/Blw problem

[Art09]

Hi,
Sometimes for some reason I'm getting double arrows @ CrossAbv/Blw. It does not happen every time there is a cross blv/abv.Seems most of the time I get single arrow as expected but sometimes there are two arrows per single cross right next to each other. If I refresh the screen it removes the second arrow. Please see attached.
Thank you very much.
Regards, Art.

[NinjaTrader_RyanM1]

Hello Art,

This is similar to the other thread you have going. Please continue working with us there.

http://www.ninjatrader.com/support/forum/showthread.php?t=35513

[finnbjurvoll]

Dbl arrow

That happens if the condition you set for the arrow is true, false and then true again during the period for the completion of the bar. You need to use a RemoveDrawObject command.

ex:

if( line1 > line2);
{
draw arrow"upArrow"+CurrentBar...etc
}
else if( line1 < line2);
{
draw arrow"downArrow"+CurrentBar...etc
}
else
{
RemoveDrawObject("upArrow" + CurrentBar);
RemoveDrawObject("downArrow" + CurrentBar);
}

Finn Jurbol

[Art09]

Thank you very much to finnbjurvoll and Ryan!

[Art09]

Hi,
Will finnbjurvoll suggestion will fix this problem? Is this all that was missed in my code please.
Thank you very much.

[finnbjurvoll]

Hi Art09

This is how I would programmed your code:

if(CrossAbove(Stochastics(PeriodD, PeriodK, Smooth),21,1))
{
DrawArrowUp("UpArrow"+CurrentBar,true,1,(arrowPos) ,Color.Lime);
}
else if(CrossBelow(Stochastics(PeriodD, PeriodK, Smooth),21,1))
{
DrawArrowUp("DownArrowArrow"+CurrentBar,true,1,(ar rowPos),Color.Red);
}
else
{
RemoveDrawObject("UpArrow"+CurrentBar);
RemoveDrawObject("DownArrow"+CurrentBar);
}

regards
Finn

[NinjaTrader_RyanM1]

Thanks for sharing, finn.

[Art09]

Hi,
I'm still getting dbl arrows.Calling RemoveDrawObject("upArrow" + CurrentBar); &
RemoveDrawObject("downArrow" + CurrentBar); after DrawArrow...() remove all arrows. Calling these methods in else as suggested does not work as there is no else, it is only above or below...
Thank you.
Art.

[NinjaTrader_Bertrand]

Have you simply tried running it with CalculateOnBarClose = true? Would it then work as you expect? The issue would only be seen realtime & in Market Replay, correct?

[Art09]

Hi,
I'm running Ninja-Sim mode. The CalculateOnBarClose = true is not what I want. Even if this will work with CalculateOnBarClose = true I will not be able to use it. I'm getting dbl arrow only sometimes and do not know why and refreshing the screen removes that double arrow.
Thank you very much.

[NinjaTrader_RyanM1]

Art,

If you want to work with COBC = false, then you must custom code the behavior you want for arrow drawing and removal. Finn offered one approach for this, that should work historically as well as real time.

[Art09]

Hi,
What's the custom code can be with Cross Above/Below please? Could you please be specific? What else can I do please?
I do appreciate finn's help but it simply does not work. The RemoveDrawObject("upArrow" + CurrentBar); removes all arrows. Besides, I do not really understand how can this work - if (...) then DrawArrowUp... else if ...Down ... else Remove? Where else? There is only up or down. I tried to use finn's suggestion and put Remove in else part or after all arrows are drawn - does not work.
Thank you.

[NinjaTrader_RyanM1]

You will have to custom code the removal logic. Since you're running with COBC = false, it's possible for the arrow to draw while the bar is forming, and without proper removal logic it remains. I tested finns snippet and it worked OK here for this purpose.

Simplify your code until everything works as you expect, and only add complexity once you've verified behavior.

[finnbjurvoll]

Art09
There must be something wrong with how you code that. I have been programming indicators for many years, both NT and eSignal. Sorry you can't get it to work.

Finn

[finnbjurvoll]

Let me explain. Let's say you are trading a 5 min chart, 2 minutes into the 5 minute period your line1 cross above line2 and your script plots an arrow on your chart. 1 minute later the the price gets lower and the line1 goes back below line2 again. The arrow that were plottet on your chart will still be there because the lines did cross. You need to add the code to remove the arrow again because now the condition is no longer true. You need to refresh your chart to remove the arrow, or you can tell NT to remove it if the condition change using RemoveDrawObject.