Slow RSI of J M Wilder’s Version

• 10/08/2025 at 11:55 PM #252365
  ma77art

  Hi I have this code from Ninjatrader 8  for Slow RSI Wilder’s version,  I am wondering if you could please translate into Prorealtime:

  #region Using declarations
  using System;
  using System.Collections.Generic;
  using System.ComponentModel;
  using System.ComponentModel.DataAnnotations;
  using System.Linq;
  using System.Text;
  using System.Threading.Tasks;
  using System.Windows;
  using System.Windows.Input;
  using System.Windows.Media;
  using System.Xml.Serialization;
  using NinjaTrader.Cbi;
  using NinjaTrader.Gui;
  using NinjaTrader.Gui.Chart;
  using NinjaTrader.Gui.SuperDom;
  using NinjaTrader.Gui.Tools;
  using NinjaTrader.Data;
  using NinjaTrader.NinjaScript;
  using NinjaTrader.Core.FloatingPoint;
  using NinjaTrader.NinjaScript.DrawingTools;
  #endregion

  //This namespace holds Indicators in this folder and is required. Do not change it.
  namespace NinjaTrader.NinjaScript.Indicators
  {

  [Gui.CategoryOrder(“Parameters”, 1)]

  public class srsi : Indicator
  {

  #region Variables
  // Wizard generated variables
  private int period = 14; // Default setting for Period
  private int emaperiod = 6; // Default setting for Emaperiod
  // User defined variables (add any user defined variables below)
  private Series<double> SRSI; //The SRSI measures the strength of a security relative to a sixday EMA
  private Series<double> srs;
  private Series<double> Averagepositivedifference;
  private Series<double> Averagenegativedifference;
  private Series<double> positivedifference;
  private Series<double> negativedifference;
  private Series<double> wEMA;
  #endregion

  protected override void OnStateChange()
  {
  /// <summary>
  /// J. Welles Wilder’s classic relative strength index has enjoyed a large following of technical analysts over the years. Here’s a slow version of it.
  /// </summary>

  if (State == State.SetDefaults)
  {
  Description = @”J. Welles Wilder’s classic relative strength index has enjoyed a large following of technical analysts over the years. Here’s a slow version of it.”;
  Name = “srsi”;
  Calculate = Calculate.OnBarClose;
  IsOverlay = false;
  DisplayInDataBox = true;
  DrawOnPricePanel = true;
  DrawHorizontalGridLines = true;
  DrawVerticalGridLines = true;
  PaintPriceMarkers = true;
  ScaleJustification = NinjaTrader.Gui.Chart.ScaleJustification.Right;
  //Disable this property if your indicator requires custom values that cumulate with each new market data event.
  //See Help Guide for additional information.
  IsSuspendedWhileInactive = true;
  }
  else if (State == State.Configure)
  {

  SRSI = new Series<double>(this); //The SRSI measures the strength of a security relative to a sixday EMA
  srs = new Series<double>(this);
  Averagepositivedifference = new Series<double>(this, MaximumBarsLookBack.Infinite);
  Averagenegativedifference = new Series<double>(this, MaximumBarsLookBack.Infinite);
  positivedifference = new Series<double>(this, MaximumBarsLookBack.Infinite);
  negativedifference = new Series<double>(this, MaximumBarsLookBack.Infinite);
  wEMA = new Series<double>(this, MaximumBarsLookBack.Infinite);

  AddPlot(Brushes.Orange, “SRSIPlot0”);
  AddPlot(Brushes.Green, “EmaSRSI”);

  }
  }

  protected override void OnBarUpdate()
  {
  //Add your custom indicator logic here.

  // Use this method for calculating your indicator values. Assign a value to each
  // plot below by replacing ‘Close[0]’ with your own formula.

  /*
  WEMA formula= price today * K + EMA yesterday * (1-K) where K = 2 / (N+1)

  Wilder EMA formula = price today * K + EMA yesterday (1-K) where K =1/N

  Where N = the number of periods.
  */

  double k=2/(emaperiod +1);

  wEMA[0] = Close[0]*k+EMA(Close,emaperiod-1)[0]*(1-k);
  //float positive_diff=(Close[0]-wEMA[0]);
  //float negative_diff=(wEMA[0]+Close[0]);
  if(Close[0]>EMA(Close,emaperiod)[0])
  positivedifference[0] = Close[0]-EMA(Close,2*(emaperiod)-1)[0];
  else
  negativedifference[0] = EMA(Close,2*(emaperiod)-1)[0]-Close[0];

  //if(positivedifference[0]>=0)
  Averagepositivedifference[0] = EMA(positivedifference,2*period-1)[0];

  //if(negativedifference[0]>=0)
  Averagenegativedifference[0] = EMA(negativedifference,2*period-1)[0];

  if(Averagenegativedifference[0]!=0)
  {
  srs[0] = Averagepositivedifference[0]/Averagenegativedifference[0];

  SRSI[0] = 100 – (100/(1+srs[0]));
  }
  else
  {
  SRSI[0] = SRSI.GetValueAt(1);
  }

  SRSIPlot0[0] = SRSI[0];

  EmaSRSI[0] = EMA(SRSI,2)[0];
  }

  #region Properties
  [Browsable(false)] // this line prevents the data series from being displayed in the indicator properties dialog, do not remove
  [XmlIgnore()] // this line ensures that the indicator can be saved/recovered as part of a chart template, do not remove
  public Series<double> SRSIPlot0
  {
  get { return Values[0]; }
  }

  [Browsable(false)] // this line prevents the data series from being displayed in the indicator properties dialog, do not remove
  [XmlIgnore()] // this line ensures that the indicator can be saved/recovered as part of a chart template, do not remove
  public Series<double> EmaSRSI
  {
  get { return Values[1]; }
  }

  [NinjaScriptProperty]
  [RefreshProperties(RefreshProperties.All)]
  [Display(Name=”Period”, Description=”srsi period”, Order=1, GroupName=”Parameters”)]
  public int Period
  {
  get { return period; }
  set { period = Math.Max(2, value); }
  }

  [NinjaScriptProperty]
  [RefreshProperties(RefreshProperties.All)]
  [Display(Name=”Emaperiod”, Description=”ema period”, Order=2, GroupName=”Parameters”)]
  public int Emaperiod
  {
  get { return emaperiod; }
  set { emaperiod = Math.Max(1, value); }
  }
  #endregion

  }
  }

  #region NinjaScript generated code. Neither change nor remove.

  namespace NinjaTrader.NinjaScript.Indicators
  {
  public partial class Indicator : NinjaTrader.Gui.NinjaScript.IndicatorRenderBase
  {
  private srsi[] cachesrsi;
  public srsi srsi(int period, int emaperiod)
  {
  return srsi(Input, period, emaperiod);
  }

  public srsi srsi(ISeries<double> input, int period, int emaperiod)
  {
  if (cachesrsi != null)
  for (int idx = 0; idx < cachesrsi.Length; idx++)
  if (cachesrsi[idx] != null && cachesrsi[idx].Period == period && cachesrsi[idx].Emaperiod == emaperiod && cachesrsi[idx].EqualsInput(input))
  return cachesrsi[idx];
  return CacheIndicator<srsi>(new srsi(){ Period = period, Emaperiod = emaperiod }, input, ref cachesrsi);
  }
  }
  }

  namespace NinjaTrader.NinjaScript.MarketAnalyzerColumns
  {
  public partial class MarketAnalyzerColumn : MarketAnalyzerColumnBase
  {
  public Indicators.srsi srsi(int period, int emaperiod)
  {
  return indicator.srsi(Input, period, emaperiod);
  }

  public Indicators.srsi srsi(ISeries<double> input , int period, int emaperiod)
  {
  return indicator.srsi(input, period, emaperiod);
  }
  }
  }

  namespace NinjaTrader.NinjaScript.Strategies
  {
  public partial class Strategy : NinjaTrader.Gui.NinjaScript.StrategyRenderBase
  {
  public Indicators.srsi srsi(int period, int emaperiod)
  {
  return indicator.srsi(Input, period, emaperiod);
  }

  public Indicators.srsi srsi(ISeries<double> input , int period, int emaperiod)
  {
  return indicator.srsi(input, period, emaperiod);
  }
  }
  }

  #endregion

   

  

  ma77art

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