The Price Rate-Of-Change (R.O.C.) indicator

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RateOChangeFromStart.efs  EFSLibrary - Discussion Board
  

File Name: RateOChangeFromStart.efs


Description:
The Price Rate-Of-Change (R.O.C.) indicator.


Formula Parameters:
Price Data To Use : Close

Notes:
Calculates the rate of change of the current Chosen Price as compared
to the first price of data. this indicator is a modification of classic
Rate-of-change indicator. The Price Rate-Of-Change (R.O.C.) indicator
(percent method) is calculated by dividing the price change over the
last x-periods by the closing price of the security x-periods ago. The
result is the percentage that the security's price has changed in the
last x-periods.
If the security's price is higher today than x-periods ago, the R.O.C.
will be a positive number. If the security's price is lower today than
x-periods ago, the R.O.C. will be a negative number.

Download File:
RateOChangeFromStart.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:            The Price Rate-Of-Change (R.O.C.) indicator.Version:            1.0  03/19/2009Formula Parameters:                     Default:    Price Data To Use                   Close Notes:    Calculates the rate of change of the current Chosen Price as compared     to the first price of data. this indicator is a modification of classic     Rate-of-change indicator. The Price Rate-Of-Change (R.O.C.) indicator     (percent method) is calculated by dividing the price change over the     last x-periods by the closing price of the security x-periods ago. The     result is the percentage that the security's price has changed in the     last x-periods.    If the security's price is higher today than x-periods ago, the R.O.C.     will be a positive number. If the security's price is lower today than     x-periods ago, the R.O.C. will be a negative number.**********************************/var fpArray = new Array();var bInit = false;function preMain() {    setPriceStudy(false);    setStudyTitle("RateOChangeFromStart");    setCursorLabelName("RateOChangeFromStart");        var x = 0;    fpArray[x] = new FunctionParameter("sPrice", FunctionParameter.STRING);    with(fpArray[x++]){        setName("Price Data To Use");        addOption("open");         addOption("high");        addOption("low");        addOption("close");        addOption("hl2");        addOption("hlc3");        addOption("ohlc4");         setDefault("close");     }}var FVal = null;var xPrice = null;function main(sPrice) {var nBarState = getBarState();var nPrice = 0;    if (nBarState == BARSTATE_ALLBARS) {        if (sPrice == null) sPrice = "close";        }    if (bInit == false) {        xPrice = eval(sPrice)();    }    nPrice = xPrice.getValue(0);    if (nPrice == null) return;    if (FVal == null) FVal = nPrice;    var nRateOChangeFromStart = (nPrice * 100) / FVal - 100;    return nRateOChangeFromStart;}