Force Index

[Russell]

Hi

I have downloaded the attached efs from the bulletin board. I am trying to understand efs and java - can anyone explain the following

why the variable XA_1 and XA1_1 are set to zero and then used in the main function area without apparently being changed?
I must be missing something but it has been bugging me!

Secondly how is the moving average plotted? I only see histogram outputs?

Any help much appreciated .

[Doji3333]

Solution...

Read my comments in the code below. I think they will help to explain what this code is doing.

Brad

/*******************************************************************
Description    : This Indicator plots Force Index indicator
Provided By    : Developed by TS Support, LLC for eSignal. (c) Copyright 2002 
********************************************************************/

function preMain()
  {
    setStudyTitle("Force Index");
    setCursorLabelName("FI Sm", 0);
    setCursorLabelName("SlowAvg", 1);
    setCursorLabelName("Zero", 2);
    setDefaultBarFgColor(Color.blue, 0);
    setDefaultBarFgColor(Color.blue, 1);
    setDefaultBarFgColor(Color.green, 2);
// the line below designates that item 0 is a HISTOGRAM, the other items (1 and 2) default
// to a LINE.
    setPlotType(PLOTTYPE_HISTOGRAM, 0);
}

// global variables use to remember the last XA1 adn XA2 values for the next instance of the main() function.
var XA1_1 = 0.0;
var XA2_1 = 0.0;

function main(XLen1, XLen2){
    if (XLen1 == null) XLen1 = 3;
    if (XLen2 == null) XLen2 = 13;

    
    var Volume = getValue("Volume", 0);
    var Close = getValue("Close", 0, -2);
    var FrceIdx = Volume * (Close[0] - Close[1]);
    var Factor1 = 2 / (XLen1 + 1);
    var Factor2 = 2 / (XLen2 + 1);
    // the two lines below use the previous bars value of XA1_1 adn XA2_1 to 
    // calculate the new bars indicator values.
    var XA1 = Factor1 * FrceIdx + (1 - Factor1) * XA1_1;
    var XA2 = Factor2 * FrceIdx + (1 - Factor2) * XA2_1;
    

   if (getBarState() == BARSTATE_NEWBAR) 
    //  At this point, the current XA1 and XA2 are stored to the global variables for use the next time
    // this indicator is calculated.
        XA1_1 = XA1;
        XA2_1 = XA2;
    
    if (XA1>0){
    setBarThickness(2);
    setBarFgColor(Color.lime);
    }
    if (XA1<0){
    setBarThickness(2);
    setBarFgColor(Color.red);
    }
    
    return new Array(XA1, XA2, 0);
} 

[Russell]

RE: Reply to post 'Force Index'

Right - so the global variables are only ever zero on the very first
iteration?
And the line/histogram - how does the efs know what is item 0,1, 2 etc

-----Original Message-----
From: [email protected] [mailto:[email protected]]
Sent: Friday, June 27, 2003 8:07 AM
To: [email protected]
Subject: Reply to post 'Force Index'


Hello Russell,

~~~~~~~~~~~~~~~~~~~~~~~~~~~~

[pj909]

wasn't this is S&C? Does anyone know which issue?