ema of an indicator

Questions about MultiCharts .NET and user contributed studies.
beggar
Posts: 27
Joined: 22 Sep 2016

ema of an indicator

Postby beggar » 11 Oct 2021

I used the ratio study to create an indicator. But when I tried to add the EMA programming to the indicator I get an error because my indicator is a variable series but the EMA is calling for an Iseries. How can I create and EMA based on the output of the ratio spread?

spread.Value = (dataseries1[0] / dataseries2[0]);

I try to enter spread.value into an ema but it fails.

Thanks

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Kate MultiCharts
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Re: ema of an indicator

Postby Kate MultiCharts » 12 Oct 2021

Hello beggar,

Here's an example based on the standard Mov_Avg_Exponential indicator:

Code: Select all

using System; using System.Drawing; using PowerLanguage.Function; namespace PowerLanguage.Indicator { [SameAsSymbol(true)] public class Mov_Avg_Exponential2 : IndicatorObject { private XAverage m_xaverage1; private VariableSeries<Double> m_avgexp; private IPlotObject Plot1; public Mov_Avg_Exponential2(object ctx) : base(ctx){ length = 9; } private VariableSeries<double> spread { get; set; } [Input] public int length { get; set; } [Input] public int displace { get; set; } protected override void Create(){ spread = new VariableSeries<double>(this); m_xaverage1 = new XAverage(this); m_avgexp = new VariableSeries<Double>(this); Plot1 = AddPlot(new PlotAttributes("AvgExp", 0, Color.Blue, Color.Empty, 0, 0, true)); } protected override void StartCalc(){ m_xaverage1.Price = spread; m_xaverage1.Length = length; } protected override void CalcBar(){ spread.Value = Bars.Close[0] / BarsOfData(2).Close[0]; m_avgexp.Value = m_xaverage1[0]; if (((displace >= 0) || Bars.CurrentBar > Math.Abs(displace))){ Plot1.Set(displace, m_avgexp.Value); } } } }

beggar
Posts: 27
Joined: 22 Sep 2016

Re: ema of an indicator

Postby beggar » 13 Oct 2021

Thank you. I am currently having another issue. I am trying to access previous values of the custom standard deviation and divide by it. I am getting errors stating that I am trying to divide by zero zscore.Value = spread[0] - m_xaverage1[1] / m_sdev[1]
How can I access previous values. Thanks

Code: Select all

using System; using System.Drawing; using PowerLanguage.Function; namespace PowerLanguage.Indicator { // [SameAsSymbol(true)] public class Mov_Avg_Exponential2 : IndicatorObject { private XAverage m_xaverage1; private VariableSeries<Double> m_avgexp; private VariableSeries<Double> m_sdev { get; set; } private VariableSeries<Double> m_lowerband; private VariableSeries<Double> m_upperband; private IPlotObject Plot1; private IPlotObject Plot2; private IPlotObject Plot3; private IPlotObject Plot4; public Mov_Avg_Exponential2(object ctx) : base(ctx){ length = 15; lengthSma = 15; numdevsdn = -2; numdevsup = 2; } private VariableSeries<double> spread { get; set; } private VariableSeries<double> zscore;// { get; set; } [Input] public int length { get; set; } [Input] public int lengthSma { get; set; } [Input] public int displace { get; set; } [Input] public double numdevsup { get; set; } [Input] public double numdevsdn { get; set; } protected override void Create(){ m_lowerband = new VariableSeries<Double>(this); m_upperband = new VariableSeries<Double>(this); spread = new VariableSeries<double>(this); zscore = new VariableSeries<double>(this); m_xaverage1 = new XAverage(this); m_avgexp = new VariableSeries<Double>(this); m_sdev = new VariableSeries<double>(this); Plot1 = AddPlot(new PlotAttributes("AvgExp", 0, Color.Red, Color.Empty, 0, 0, true)); Plot2 = AddPlot(new PlotAttributes("Spread", 0, Color.Black, Color.Empty, 0, 0, true)); Plot3 = AddPlot(new PlotAttributes("Deviation", 0, Color.Yellow, Color.Empty, 0, 0, true)); Plot4 = AddPlot(new PlotAttributes("spp", 0, Color.Orange, Color.Empty, 0, 0, true)); } protected override void StartCalc(){ m_xaverage1.Price = spread; m_xaverage1.Length = length; } protected override void CalcBar(){ m_upperband.Value = (m_avgexp.Value + (numdevsup*m_sdev.Value)); m_lowerband.Value = (m_avgexp.Value + (numdevsdn*m_sdev.Value)); spread.Value = Bars.Close[0] /BarsOfData(2).Close[0]; m_avgexp.Value = m_xaverage1[0]; m_sdev.Value = spread.StandardDeviationCustom(lengthSma, 1); zscore.Value = spread[0] - m_xaverage1[1] / m_sdev[1]; if (((displace >= 0) || Bars.CurrentBar > Math.Abs(displace))){ Plot1.Set(displace, m_sdev.Value); // Plot2.Set(displace, spread.Value); // Plot3.Set(displace, (spread.Value - m_avgexp.Value) / m_sdev.Value); // Plot1.Set(displace, m_upperband.Value); // Plot2.Set(displace, m_lowerband.Value); // Plot3.Set(displace, m_avgsma.Value); Plot4.Set(displace, m_sdev.Value); } } } }


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