Passing an array as argument to a function

[Stanfillirenfro]

Hello!

Have a look please to the following piece of code and I explain afterwards what the problem is.

if (State == State.SetDefaults)
{AddPlot(new Stroke(Brushes.Orange, 2), PlotStyle.TriangleUp, "Buys");
AddPlot(new Stroke(Brushes.Orange, 2), PlotStyle.TriangleDown, "Sells");}

protected override void OnBarUpdate()
{if (myCondition) Step1(Buys, Sells, value1);}

#region Helpers
int Step1(ref double[] array1, ref double[] array2, int value2)
{//myCode}
#endregion

After compiling, I receive the following error messages:
1) Not valid arguments. (In the section "protected override void OnBarUpdate()")
2) Argument 1 and argument 2: Conversion of Ninjatrader.Ninjatrader.Series <douvle> in ref []double not possible.

I failed here to find a solution.
If the conversion of ref double[] array1 and ref double[] array2 to Buys and Sells is not possible, what could be the correct way to write the code in the section protected override void OnBarUpdate() oder in the section #region Helpers?

Thanks in advance!

[NinjaTrader_Jesse]

Hello Stanfillirenfro,

The NinjaScript Series type is not an array so you can't define a method like that if you want to pass a series. You would need to use Series<double> in place of your double[]. You also don't need the ref keyword if you are passing a series to work with it in a local method.

Please let me know if I may be of further assistance.

[Stanfillirenfro]

Many thanks Jesse for your reply.

I try it now and will revert to you for feedback.

[Stanfillirenfro]

Jesse,as far as I know, the declaration of Series<double> occurs just at he beginning of

public class myIndicator : Indicator
{ #region Variables
   private Series<double> xxx1
  #enregion

and its initialization occurs in

else if (State == State.DataLoaded)
{
xxx1 = new Series<double>(this);}

In my case,, I am in a function in a section #region Helpers. I guess I should declare the Series<double> in the function int Step1(Series<double> xxx1). Should I initialize it also in this function as follow?

#region Helpers
int Step1(Series<double> xxx1)
{xxx1 = new Series<double>(this);}
#enregion

Thanks!

[NinjaTrader_Jesse]

Hello Stanfillirenfro,

A C# function has any parameters within its parenthesis :

MyFunction(Type1 parameter1, Type2 paramter2, etc..)

It would look like

MyFunction(Series<double> mySeries)

Please let me know if I may be of further assistance.

[Stanfillirenfro]

Thnaks Jesse fo your reply. Nice!
But Jesse the next step which is usally

mySeries = new Series<double>(this);

needs to be writing somewhere or I do not need it in my function? Is just the declaration enough?

[NinjaTrader_Jesse]

Hello Stanfillirenfro,

You don't need to re define a new series in your function, you would just use the series you had passed in to the method. The series would be defined in your scripts class just as the help guide shows. You could then pass that mySeries into your method

MyFunction(mySeries);

The definition of the function would look like this:

MyFunction(Series<double> mySeries)
{
  // use mySeries here
}

Please let me know if I may be of further assistance.

[Stanfillirenfro]

Thanks Jesse for your reply.

It is a bit confusing for me here.
What I have learned with Series is that before using them one should make a dynamic allocation with new such as folowed:

mySeries = new Series<double>(this);

In your reply

"
MyFunction(Series<double> mySeries) { // use mySeries here }"

should I make any dynamic allocation of mySeries before using it?

Thanks!

[NinjaTrader_Jesse]

Hello Stanfillirenfro,

You can see the help guide sample for an example of how to make a series, there is not another way to make a series. https://ninjatrader.com/support/help...t8/seriest.htm

You can only use the series after it had been created so depending on what your method does would determine where the call to that method goes. It could go on the following line after the series is created or you can use that method from OnBarUpdate or the other areas which follow the creation of the series.

Please let me know if I may be of further assistance.

[Stanfillirenfro]

Thanks you Jesse for your help.
It is becoming clearer. I wil revert to you if I face another problem.

Many thanks!