Data Type Issues

[jeliner]

Hello.

I am a recent conversion from TradeStation to NinjaTrader and I am attempting to convert my indicators into Ninja 7. I have a few questions and an issue I cant get past

Questions:
========
1) How do you assign a value to plot? From what I understand, Ninja has something called a values collection.. but I don't understand how it is used. I have a function that I want to return a value that I want plotted. How do I tell my plot statement to use that value? I tried Values.Set(MyFunction) but I am not getting anything to plot with the Add(new Plot(color, line, "name")); function.

2) How do you plot marker lines? I want horizontal lines at 100, 40, 0, -40, and -100 but I can seem to pass a straight value into the plot statement to get these lines to plot.


3) I am having a weird datatype issue. It is my understanding that the double[] datatype can hold an array of numbers ... but on this statement...
vOsc = 0; I get an error that I am trying to convert an INT to double. vOsc is declared in my variables section as private double[] vOsc;

[BigRo]

Here a script that should showcase what you are asking for in the first 2 questions. hope that helps you adjust your script in a correct way.

namespace NinjaTrader.Indicator
{

    [Description("")]
    public class TestIndicator : Indicator
    {


        protected override void Initialize()
        {
            Add(new Plot(Color.Orange, "plot"));
            Add(new Line(Color.Green, 0, "Lower"));    
            Overlay                = false;
        }


        protected override void OnBarUpdate()
        {

            if (CurrentBar == 0)
                Value.Set(0);
            else
            {
                double myfunction = (Close[0]-Close[1])/Close[1];
                    Value.Set(myfunction);
            }
        }

        //#region Properties
        [XmlIgnore()]        
        [Browsable(false)]
        public DataSeries plot
        {
            get { return Values[0]; }
        }
        //#endregion
    }
}

regarding question 3.

double is not an array, double is just a value. the difference between double and int is that double can be defined as any real number such as 0,1,1.23477,-2.34894
while int can only be whole numbers such as -1,0,2,3

the correct notation for a double variable is

private double vOsc;

if you change that, it should work.

[NinjaTrader_JessicaP]

To add some to BigRo's answer, C# does not do implicit casting as frequently as other programming languages do. I am including a publicly available link to the MSDN documentation for casting and type conversion, to remove any mystery as to when C# will require a cast.

https://msdn.microsoft.com/en-us/library/ms173105.aspx

We can see in its explicit conversion section a situation where there is no implicit conversion between doubles and ints in the explicit conversion example.

Please let us know if there are any other ways we can help.