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

[eSignal]

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  03/19/2009

Formula 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;
}