Cumulative Volume Index

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CumulativeVolumeIndex.efs  EFSLibrary - Discussion Board

File Name: CumulativeVolumeIndex.efs

Cumulative Volume Index

Formula Parameters:
Exchange : NYSE


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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:            Cumulative Volume Index    Version:            1.0  07/06/2009    Formula Parameters:                     Default:    Exchange                            NYSENotes:**********************************/var fpArray = new Array();var bInit = false;function preMain(){    setPriceStudy(false);    setStudyTitle("Cumulative Volume Index");    setCursorLabelName("CumVol");        var x=0;    fpArray[x] = new FunctionParameter("sExchange", FunctionParameter.STRING);	with(fpArray[x++]){        setName("Exchange");        addOption("NYSE");         addOption("NASDAQ");                 setDefault("NYSE");    }}var xCumVolIdx = null;function main(sExchange) {var nBarState = getBarState();    if (nBarState == BARSTATE_ALLBARS) {        if (sExchange == null) sExchange = "NYSE";    }    if(!bInit){        xCumVolIdx = efsInternal("Calc_CumVol", sExchange);    }    return xCumVolIdx.getValue(0);}var xAdvance = null;var xDecline = null;function Calc_CumVol(_exchange){    if(getBarState() == BARSTATE_ALLBARS){        if(_exchange == "NYSE") {            xAdvance = close(sym("$UVOL"));            xDecline = close(sym("$DVOL"));        }else if(_exchange == "NASDAQ") {            xAdvance = close(sym("$UVOLQ"));            xDecline = close(sym("$DVOLQ"));        }    }    if(xAdvance.getValue(-2) == null || xDecline.getValue(-2) == null) return;    if(getCurrentBarCount() > 1) var nRef = ref(-1);    var CumVol = nRef+(xAdvance.getValue(0) - xDecline.getValue(0));    return CumVol;}