change length of indicator dynamically

ernay · Postby **ernay** » 27 Jul 2020

hi there,
I'm using a 1minute chart and want to have an indicator (like a moving average) that gives me a length equal to the number of bars in the current session. So basically, on each new bar, the length of the indicator would increase by 1, and would be reflected in the plot. I tried to implement this, but the indicator will not change from the original length used. Is there a way to "reinitialize" the indicator on each new bar with the new length I want to use?

Thanks.

Vlada MultiCharts · Postby **Vlada MultiCharts** » 06 Aug 2020

Hello ernay,

You can use the keyword recalculate.

Here is an example:

Code: Select all

inputs: 
Price( Close ),
Displace( 0 );
var: var0( 0 );
var: ReCalcPersist Length( 9 );
print(currentbar + MaxBarsBack , " ", Length);
var0 = AverageFC( Price, Length ) ;
condition1 = Displace >= 0 or CurrentBar > AbsValue( Displace ) ;
if condition1 then 
begin
	Plot1[Displace]( var0, "Avg" ) ;
end;
if getappinfo(aiRealTimeCalc) = 1 and LastBarOnChart and barstatus(1) = 2 then
begin
	length = length + 1; 
	recalculate;
end;

ernay · Postby **ernay** » 08 Aug 2020

Thanks Vlada. What would this look like for power language?

Best,
Ernie

Vlada MultiCharts · Postby **Vlada MultiCharts** » 19 Aug 2020

Hello Ernie,

Above is an example for regular MultiCharts (PowerLanguage).

You can also check the example for MultiCharts .NET:

Code: Select all

using System;
using System.Drawing;
using PowerLanguage.Function;
namespace PowerLanguage.Indicator
{
    [SameAsSymbol(true)]
    public class MovAVGRec: IndicatorObject
    {
        public MovAVGRec(object ctx): base(ctx){}
        private ISeries<double> price {get; set;}
        private AverageFC m_averagefc1;
        private VariableSeries<Double> m_avg;
        private IPlotObject Plot1;
		public int length = 9;
        [Input]
        public int displace { get; set; }
        protected override void Create()
		{
            m_averagefc1 = new AverageFC(this);
            m_avg = new VariableSeries<Double>(this);
            Plot1 = AddPlot(new PlotAttributes("Avg", 0, Color.Yellow, Color.Empty, 0, 0, true));
        }
        protected override void StartCalc()
		{
			Output.WriteLine(" Length = {0} ", length);
            price = Bars.Close;
            m_averagefc1.price = price;
            m_averagefc1.length = length;
        }
        protected override void CalcBar()
		{
            m_avg.Value = m_averagefc1[0];
            if (displace >= 0 || Bars.CurrentBar > Math.Abs(displace))
			{
                Plot1.Set(displace, m_avg.Value);
            }
			if (Environment.IsRealTimeCalc && Bars.LastBarOnChart && Bars.Status == EBarState.Close)
            {
				length = length + 1;
				ExecControl.Recalculate(); 
			}
        }
    }
}

change length of indicator dynamically

change length of indicator dynamically

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Re: change length of indicator dynamically