2003 Jan: Moving Trend (Rafter Indicator)

rafter.efs  
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File Name: rafter.efs

Description:
Moving Trend (Rafter Indicator)

Formula Parameters:

• N : 20

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

Download File:
rafter.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:        
    Moving Trend (Rafter Indicator)
    
Version:            1.0  05/19/2009
     
Formula Parameters:                     Default:
    N                                   20
    
Notes:
    The related article is copyrighted material. If you are not a subscriber
    of Stocks & Commodities, please visit www.traders.com.

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

function preMain() {
    setStudyTitle("Movtrend");
    setCursorLabelName("Movtrend", 0);
    setDefaultBarFgColor(Color.blue, 0);
    setPriceStudy(true);
    var x = 0;
    fpArray[x] = new FunctionParameter("n", FunctionParameter.NUMBER);
    with(fpArray[x++]) {
        setName("N");
        setLowerLimit(1);
        setDefault(20);
    }    
}

var xMovTrend = null;

function main(n) {
var nBarState = getBarState();
var nMovTrend = 0;
    if (nBarState == BARSTATE_ALLBARS) {
        if(n == null)  n = 20;
	}	
	if (bInit == false) {
        xMovTrend = efsInternal("MovTrend", n);
        bInit = true;
	}
	nMovTrend = xMovTrend.getValue(0);
	if (nMovTrend == false) return;
    return nMovTrend; 
}

var xClose = null;

function MovTrend(n) {
var nRes = 0;
var sum = 0;
var i = 0;
	if (xClose == null) xClose = close();
	if (xClose.getValue(-n) == null) return;
	for(i = n; i > 0; i--)
		sum += (i - (n + 1) / 3) * xClose.getValue(i - n);
	nRes = 6 / (n * (n + 1)) * sum;
	return nRes;
}