Keltner ATR Band

Keltner_ATR_Band.efs  
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File Name: Keltner_ATR_Band.efs

Description:
Keltner ATR Band

Formula Parameters:

• Length : 50
• ATRMult : 3.75

Notes:

Download File:
Keltner_ATR_Band.efs


EFS Code:

/*********************************
Provided By:  
    eSignal (Copyright c eSignal), a division of Interactive Data 
    Corporation. 2009. 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:        
    Keltner ATR Band
    
Version:            1.0  10/29/2009
 
Formula Parameters:                     Default:
    Length                              50
    ATRMult                             3.75
    
Notes:
    
**********************************/
var fpArray = new Array();
var bInit = false;

function preMain(){
    setPriceStudy(true);
    setShowCursorLabel(true);
    setShowTitleParameters(false);
    setStudyTitle("Keltner ATR Band");
    setCursorLabelName("Up Band", 0);
    setPlotType(PLOTTYPE_LINE, 0);
    setDefaultBarFgColor(Color.red, 0);
    setCursorLabelName("Dn Band", 1);    
    setPlotType(PLOTTYPE_LINE, 1);
    setDefaultBarFgColor(Color.red, 1);
    var x = 0;
    fpArray[x] = new FunctionParameter("Length", FunctionParameter.NUMBER);
    with(fpArray[x++]) {
        setLowerLimit(1);
        setDefault(50);
    }    
    fpArray[x] = new FunctionParameter("ATRMult", FunctionParameter.NUMBER);
    with(fpArray[x++]) {
        setLowerLimit(1);
        setDefault(3.75);
    }        
}

var xKUp = null;
var xKDn = null;

function main(Length, ATRMult) {
var nBarState = getBarState();
var nKU = 0;
var nKL = 0;
    if (nBarState == BARSTATE_ALLBARS) {
        if(Length == null) Length = 50;
        if(ATRMult == null) ATRMult = 3.75;
	}
	if (bInit == false) {
        xKUp = efsInternal("Calc_KeltnerBand", Length, ATRMult);
        xKDn = getSeries(xKUp, 1);
        bInit = true;
	}
    nKU = xKUp.getValue(0);
    nKL = xKDn.getValue(0);
    if (nKU == null || nKL == null) return;
    return new Array(nKU, nKL);
}

var bSecondInit = false;
var xMA = null;
var xATR = null;

function Calc_KeltnerBand(Length, ATRMult) {
var nResUp = 0;
var nResDn = 0;
var nMA = 0;
var nATR = 0;
	if (bSecondInit == false) {
        xMA = sma(Length);
        xATR = atr(Length);
        bSecondInit = true;
	}
    nMA = xMA.getValue(0);
    nATR = xATR.getValue(0);
    if (nMA == null || nATR == null) return;
    nResUp = nMA + ATRMult * nATR;
    nResDn = nMA - ATRMult * nATR;
    return new Array(nResUp, nResDn);
}