Indicator Plot

[sdauteuil]

I am trying to create a simple indicator that sums 3 periods of the cumulative delta.

I cannot figure out how to get the addplot() to work.

If I try and assign the logic to the variable I created I get "cannot convert double" errors when compiling.
I also tried to use value[0] which will compile but the chart panel is blank.

I have attached the indicator.

I have gone through the help guide and cannot figure out what I am doing wrong.
I think the help guide will make more sense after I successfully get a plot to work.

appreciate the help in advance.

Also are there any videos from NT for creating indicators?

[s.kinra]

Hello sdauteuil,
You can use as below:-

Option 1 : CumulativeDeltaPLot[0] = SUM(cumulativeDelta.DeltaClose, 3)[0];
Option 2 : Values[0][0] = SUM(cumulativeDelta.DeltaClose, 3)[0];

Hope it helps!

[sdauteuil]

I was trying

Option 1 : CumulativeDeltaPLot[0] = SUM(cumulativeDelta.DeltaClose, 3)[0];

but I get 'CumulativeDeltaPlot' does not exist in the current context when compiling.

I have it defined under properties
#region Properties

[Browsable(false)]
[XmlIgnore]
public Series<double> CumulativeDeltaPlot
{
get { return Values[0]; }
}

#endregion

***

When I tried Option 2 : Values[0][0] = SUM(cumulativeDelta.DeltaClose, 3)[0];

The code will compile but the panel on the chart is empty. I turned on tick replay but that didn't help.


Thank you

[s.kinra]

I think I made a copy paste error, please correct it as :-

CumulativeDeltaPlot[0] = SUM(cumulativeDelta.DeltaClose, 3)[0];

Note:

You're using PlotStyle.Bar, change this to Line & be sure to have Auto Scale selected.

[s.kinra]

Let me also ask if you're getting any errors in Control Center Log tab ?

[sdauteuil]

That was able to compile

I changed PlotStyle to Line and added IsAutoScale = true;

However the indicator panel is still empty

[sdauteuil]

Log error

11/22/2020 12:28:19 AM	Default	Indicator 'TestCumulativeDeltaSum': Error on calling 'OnBarUpdate' method on bar 0: Object reference not set to an instance of an object.

[s.kinra]

OK great, it means no issues with plot. Order Flow might be unable to process on first bar, so you can exclude it.
You need to add this :-

protected override void OnBarUpdate()
{[INDENT]if(CurrentBar < 3)[/INDENT][INDENT=2]return;[/INDENT]
 ...  // rest of code
}

You can adjust it later.

[sdauteuil]

I had tried adding that

if (BarsInProgress != 0)
return;

if (CurrentBars[0] < 20)
return;

whatever number I put in the CurrentBars statement comes up in the error log.

11/22/2020 9:15:56 AM	Default	Indicator 'TestCumulativeDeltaSum': Error on calling 'OnBarUpdate' method on bar 20: Object reference not set to an instance of an object.

I have tried adding Print() statements to debug it, none of the statements print in the output window only the error.
I thought maybe there was a spelling or upper / lower case error but haven't found any.

The latest version is attached

[sdauteuil]

I also tried adding

if ((CurrentBars[0] < 20)
|| (CurrentBars[1] < 20))
return;

In case the secondary series was the problem

[sdauteuil]

I found this in a previous post... not sure if this has anything to do with it

The secondary series is synced with the primary series

However there is no property region to define variables


protected override void OnBarUpdate()
{
if (BarsInProgress == 0)
{
// Print the close of the cumulative delta bar with a delta type of Bid Ask and with a Session period
Print("Delta Close: " + cumulativeDelta.DeltaClose[0]);
}
else if (BarsInProgress == 1)
{
// We have to update the secondary series of the hosted indicator to make sure the values we get in BarsInProgress == 0 are in sync
cumulativeDelta.Update(cumulativeDelta.BarsArray[1].Count - 1, 1);
}

[Robotman]

I am trying to create a simple indicator that sums 3 periods of the cumulative delta.

I cannot figure out how to get the addplot() to work.

Hi sdauteuil

I have created several indicators based on CD and found a good example by NinjaTrader_PaulH located here:

https://ninjatraderecosystem.com/user-app-share-download/ofcdkeltner/

It is a good reference for a starting point.

Robotman

[NinjaTrader_ChelseaB]

Hello sdauteuil,

In the file you posted in Post #1 I am able to import this, and there is no compile error.
However, there is logic run-time error.

You have 'if (State == State.DataLoaded)' nested within the action block for 'else if (State == State.Configure).

If the State is State.Configure then it cannot also be State.DataLoaded at the same time.
The condition on line 58 will never be true, and the cumulativeDelta will never have an indicator instance assigned.

Change this to 'else if (State == State.DataLoaded)' and move this below the action block for State.Configure, currently on line 65.


In the file you have posted in Post #11, I am not seeing any issue. This runs and I am seeing prints appearing in the output window. Let me know if you need a video of the script being tested and showing prints in the output window.

[sdauteuil]

Thank you that worked

In the first one the indicator wizard didn't add the State == State.DataLoaded
apparently I added that incorrectly.

In the second one the print function was working but no property area was create to define the series/variable
I wasn't sure how to create the series for the plot.

[sdauteuil]

Thanks Robotman for that information