The Center Of Gravity

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Gravity.efs  EFSLibrary - Discussion Board
  

File Name: Gravity.efs


Description:
The Center Of Gravity


Formula Parameters:
Length : 10

Notes:
This indicator identifies every major turning point without much lag.
This indicator is computed in a similiar way to the Ehlers filter.
The position of the balance point is the summation of the product of
position within the observation window multiplied by the price at that
position divided by the summation of prices across the window. The formula is:
CG = SUM(x+1) * Price(i) / SUMPrice(i)
In this formula "1" is added to the position count because it starts with
the most recent price at zero, and multiplying the most recent price by that
position count would remove it from the computation.

Download File:
Gravity.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 Center Of Gravity    Version:            1.0  05/05/2009    Formula Parameters:                     Default:    Length                              10Notes:    This indicator identifies every major turning point without much lag.     This indicator is computed in a similiar way to the Ehlers filter.     The position of the balance point is the summation of the product of     position within the observation window multiplied by the price at that     position divided by the summation of prices across the window. The formula is:    CG = SUM(x+1) * Price(i) / SUMPrice(i)    In this formula "1" is added to the position count because it starts with     the most recent price at zero, and multiplying the most recent price by that     position count would remove it from the computation. **********************************/var fpArray = new Array();var bInit = false;function preMain() {	setStudyTitle("Center of Gravity Oscillator");    setCursorLabelName("Gravity", 0);	    setCursorLabelName("Temp", 1);	    	setPriceStudy(false);	setDefaultBarFgColor(Color.red, 1);	setDefaultBarFgColor(Color.blue, 0);    var x = 0;    fpArray[x] = new FunctionParameter("Length", FunctionParameter.NUMBER);    with(fpArray[x++]) {        setLowerLimit(1);        setDefault(10);    }}var xGravity = null;function main(Length) {var nBarState = getBarState();var nGravity = 0;var nTemp = 0;    if (nBarState == BARSTATE_ALLBARS) {        if(Length == null) Length = 10;    }        if (bInit == false) {        xGravity = efsInternal("Calc_Gravity", Length);        bInit = true;    }    nGravity = xGravity.getValue(0);    nTemp =  xGravity.getValue(-1);    if (nTemp == null) return;    return new Array(nGravity, nTemp);}var bSecondInit = false;var xHL2 = null;function Calc_Gravity(Length) {var nRes = 0;var i = 0;var nHL2 = 0;var num = 0;var denom = 0;    if (bSecondInit == false) {        xHL2 = hl2();        bSecondInit = true;    }    if (xHL2.getValue(-Length) == null) return;    for(i = 0; i < Length; i++) {        nHL2 = xHL2.getValue(-i);        num += (1 + i) * nHL2;        denom += nHL2;    }    if(denom != 0) 	nRes = - num / denom;    return nRes;}