2002 Jan: Relative Vigor Index (RVI), by John Ehler's

[eSignal]

File Name: RelativeVigorIndex.efs

Description:
The following study is based on the January 2002 article, Relative Vigor Index (RVI), by John Ehlers's.

Formula Parameters:
Line Color RVI: Red
Line Color Sig: Blue
Line Thicknes: 2
Display Cursor Labels: False



Notes:
The related article is copyrighted material. If you are not a subscriber of Stocks & Commodities, please visit www.traders.com

Download File:
RelativeVigorIndex.efs



EFS Code:

/*********************************
Provided By:  
    eSignal (Copyright c eSignal), a division of Interactive Data 
    Corporation. 2008. All rights reserved. This sample eSignal 
    Formula Script (EFS) is for educational purposes only and may be 
    modified and saved under a new file name.  eSignal is not responsible
    for the functionality once modified.  eSignal reserves the right 
    to modify and overwrite this EFS file with each new release.
   

Description:        
    Relative Vigor Index

Version:            1.0  18/09/2008

Notes:
    The related article is copyrighted material. If you are not a subscriber
    of Stocks & Commodities, please visit [url]www.traders.com.[/url]

Formula Parameters:                     Default:
    Line Color RVI                          Red
    Line Color Sig                          Blue
    Line Thicknes                             2
    Display Cursor Labels                   False
**********************************/


var fpArray = new Array();
var bInit = false;

function preMain() {

    setPriceStudy(false);
    setShowCursorLabel(false);
    setShowTitleParameters( false );
    
    setStudyTitle("Relative Vigor Index");
    setCursorLabelName("RVI", 0);
    setCursorLabelName("Sig", 1);    

    setDefaultBarFgColor(Color.red, 0);
    setDefaultBarFgColor(Color.blue, 1);    
    setPlotType(PLOTTYPE_LINE, 0); 
    setPlotType(PLOTTYPE_LINE, 1);     

    setDefaultBarThickness(2, 0);
    setDefaultBarThickness(2, 1);
   
    askForInput();
    var x=0;
    fpArray[x] = new FunctionParameter("LineColor1", FunctionParameter.COLOR);
    with(fpArray[x++]){
        setName("Line Color RVI");
        setDefault(Color.red);
    }    

    fpArray[x] = new FunctionParameter("LineColor2", FunctionParameter.COLOR);
    with(fpArray[x++]){
        setName("Line Color Sig");
        setDefault(Color.blue);
    }    


    fpArray[x] = new FunctionParameter("ViewValue", FunctionParameter.BOOLEAN);
    with(fpArray[x++]){
        setName("Display Cursor Labels");
        setDefault(false);
    }    
    
    fpArray[x] = new FunctionParameter("Length", FunctionParameter.NUMBER);
    with(fpArray[x++]){
        setLowerLimit(1);        
        setDefault(10);
    }

    fpArray[x] = new FunctionParameter("Thickness", FunctionParameter.NUMBER);
    with(fpArray[x++]){
        setName("Line Thickness");
        setLowerLimit(1);        
        setDefault(2);
    }


}

var xChange = null;
var xMyRange = null;
var xValue1First = null;
var xValue2First = null;
var xValue1Two = null;
var xValue2Two = null;
var xRVI = null;
var xRVISig = null;
var xNum = null;
var xDen = null;



function main(Length, Thickness, LineColor1, LineColor2, ViewValue) {
var nLength1 = 0;
var nLength2 = 0;
var nRVI = 0;
var nRVISig = 0;


    if ( bInit == false ) { 
        setDefaultBarFgColor(LineColor1, 0);
        setDefaultBarFgColor(LineColor2, 1);
        setDefaultBarThickness(Thickness, 0);
        setDefaultBarThickness(Thickness, 1);
        setShowCursorLabel(ViewValue);        

        xChange = efsInternal("Calc_Change");
        xMyRange = efsInternal("Calc_MyRange");

        nLength1 = Math.floor((4 + 1) * 0.5);
        nLength2 = Math.ceil((4 + 1) * 0.5);


        xValue1First = efsInternal("TriAverage_gen", xChange, nLength1);
        xValue2First = efsInternal("TriAverage_gen", xMyRange, nLength1);

        xValue1Two = efsInternal("TriAverage_gen", xValue1First, nLength2);
        xValue2Two = efsInternal("TriAverage_gen", xValue2First, nLength2);

        xNum = efsInternal("Summation", xValue1Two, Length ) ;
        xDen = efsInternal("Summation", xValue2Two, Length ) ;

        xRVI = efsInternal("Calc_RVI" , xNum , xDen);

        xRVISig = efsInternal("TriAverage_gen", xRVI, 4 ) ;

        bInit = true; 
    } 

    if (getCurrentBarCount() < Length) return;

    nRVI = xRVI.getValue(0);
    nRVISig = xRVISig.getValue(0);
  
    return new Array(nRVI, nRVISig); 


}

function Calc_RVI(xNum, xDen){
var nRes = 0;
    if (xDen.getValue(0) > 0) {
        nRes = (xNum.getValue(0) / xDen.getValue(0));
        return nRes;
    }
    return 0;
}

function Summation(xSeries, nLength){
var nRes = 0;
    for (var i = 0; i < nLength; i++) {
           nRes += xSeries.getValue(-i); 
    } 
    if (nRes == null) nRes = 1;
    return nRes;
}


function TriAverage_gen(xSeries, nLength){
var nRes = 0;
    for (var i = 0; i < nLength; i++) {
           nRes += xSeries.getValue(-i); 
    } 
    nRes = nRes / nLength;
    if (nRes == null) nRes = 1;
    return nRes;
}

function Calc_Change(){
var nRes = 0;
    nRes = close(0) - open(0);
    if (nRes == null) nRes = 1;
    return nRes;
}

function Calc_MyRange(){
var nRes = 0;
    nRes = high(0) - low(0);
    if (nRes == null) nRes = 1;
    return nRes;
}