Making a MACD with t3 averages

[pmurraymc]

Hello,

I have been using Alex's T3 ma functions in an ma crossover efs, to gain an extra bar on the crossing of the MA's I have been trying to make a MACD type indicator from these MA's.

I am using a cheat for a signal line at present (value for prev bar), but would like to use an MA, is there anyway to make an ema of the difference, using a series of the difference.

Thanks in advance.

Paul Murray.

here is current efs.

[pmurraymc]

Already have a version using t3 averages coded in loops.

[ACM]

Paul
There are several ways this could be done One of them is to use the efsInternal() function to pass the two series to a separate function in which you calculate the difference between their values. The efsInternal() function then returns a series which you can use as a source for the ema function. This process is explained in detail in this post which you may want to review. The only difference is that in that example I use efsExternal() instead of efsInternal().
The enclosed revision of your efs includes comments with regards to the changes made
Alex

//Alexis C. Montenegro © January 2005                       
//Use and/or modify this code freely. If you redistribute it
//please include this and/or any other comment blocks and a 
//description of any changes you make.   

//Paul Murray
//Making a MACD type indicator from a cross of T3 moving averages

//ACM - Modified original to create a MACD with Signal line

// NOTE:                                                                          
// This efs requires amStudies.efsLib in the FunctionLibrary folder.              
// If you do not have this file you can download it at the link below.            
//http://share.esignal.com/groupcontents.jsp?folder=Formulas-Libraries&groupid=10

var fpArray = new Array();

var lastrawtime = 0;
var BarCount = 0;

var grID = 0;  

function preMain() {

    setPriceStudy(false);
    setStudyTitle("T3 MA 3,5 cross MACD");
    setCursorLabelName("T3_1",0);
    setCursorLabelName("T3_2",1); 
    setCursorLabelName("T3_3",2);    
    setDefaultBarFgColor(Color.blue,0);
    setDefaultBarFgColor(Color.red,1); 
    setPlotType(PLOTTYPE_LINE,0);
    setPlotType(PLOTTYPE_INSTANTCOLORLINE,1);
    setDefaultBarThickness(2,0);
    setDefaultBarThickness(2,1);   
 
//    askForInput();
 
    addBand(0, PS_DASH, 3, Color.black);     

           
    var x=0;
    fpArray[x] = new FunctionParameter("Length1", FunctionParameter.NUMBER);
 with(fpArray[x++]){
        setLowerLimit(1);  
        setDefault(5);
    }
    fpArray[x] = new FunctionParameter("Length2", FunctionParameter.NUMBER);
 with(fpArray[x++]){
        setLowerLimit(1);  
        setDefault(3);
    }      
    fpArray[x] = new FunctionParameter("Factor", FunctionParameter.NUMBER);
 with(fpArray[x++]){
        setUpperLimit(1); 
        setLowerLimit(0);  
        setDefault(0.7);
    }
 fpArray[x] = new FunctionParameter("Source", FunctionParameter.STRING);
 with(fpArray[x++]){
        addOption("open"); 
        addOption("high");
        addOption("low");
        addOption("close");
        addOption("hl2");
        addOption("hlc3");
        addOption("ohlc4"); 
        setDefault("close"); 
    }
 fpArray[x] = new FunctionParameter("Symbol", FunctionParameter.STRING);
    with(fpArray[x++]){
        setDefault();
 }
 fpArray[x] = new FunctionParameter("Interval", FunctionParameter.STRING);
 with(fpArray[x++]){
        setDefault();
    }
    fpArray[x] = new FunctionParameter("Offset", FunctionParameter.NUMBER);
 with(fpArray[x++]){
        setDefault(0);
    }
    fpArray[x] = new FunctionParameter("Params", FunctionParameter.BOOLEAN);
 with(fpArray[x++]){
        setName("Show Parameters");
        setDefault(false);
    }
 fpArray[x] = new FunctionParameter( "Linecolor1", FunctionParameter.COLOR);
 with( fpArray[x] ) {
  setDefault( Color.blue );
 }      
 fpArray[x] = new FunctionParameter( "Linecolor2", FunctionParameter.COLOR);
 with( fpArray[x] ) {
  setDefault( Color.red );
 }  
 fpArray[x] = new FunctionParameter( "Alerts", FunctionParameter.NUMBER);
 with( fpArray[x] ) {
        setUpperLimit(2); 
        setLowerLimit(1);
  setDefault(2);
 }   
}

var amLib = addLibrary("amStudies.efsLib");

var bInit = false;
//var xT3 = null;//removed by ACM
var xT31 = null;//added by ACM - was missing
var xT32 = null;//added by ACM - was missing
var xMACD = null;//added by ACM
var xSig  = null;//added by ACM

var vLastAlert = -1;
var vLastxAlert = -1;
var vLastaAlert = -1;

//var macd=0;//removed by ACM

function main(Length1, Length2, Factor, Source, Symbol, Interval, Offset, Params, Linecolor1, Linecolor2, Alerts) {

    if(bInit == false){
        with( amLib ) {
        if(Symbol == null) Symbol = getSymbol();
        if(Interval == null) Interval = getInterval();
        var vSymbol = Symbol+","+Interval;
        xT31 = offsetSeries(amT3(Length1, Factor, eval(Source)(sym(vSymbol))), Offset);
        xT32 = offsetSeries(amT3(Length2, Factor, eval(Source)(sym(vSymbol))), Offset);
        xMACD = efsInternal("calcMACD", xT31, xT32); //added by ACM
        xSig = ema(3, xMACD); //added by ACM - replace 3 with other value or variable
        setShowTitleParameters(eval(Params));
        setDefaultBarFgColor( Linecolor1, 0 );
        setDefaultBarFgColor( Linecolor2, 1 );
        bInit = true;
        }
    }

    var x1 = getSeries(xMACD); //modified by ACM - was missing var
    var x2 = getSeries(xSig); //modified by ACM - was missing var
  
    //F_1=xT31.getValue(-1); //removed by ACM
    //F_2=xT32.getValue(-1); //removed by ACM
  
    //macd=x2-x1;//removed by ACM
    //sig=F_2-F_1;//removed by ACM
    
    return new Array(x1,x2);
}
  
function gID() {
    grID ++;
    return( grID );
}
//function added by ACM
function calcMACD(avg1,avg2){
    if(avg1.getValue(0)==null || avg2.getValue(0)==null) return;//null check
    return (avg2.getValue(0) - avg1.getValue(0));
}
//end function 

[pmurraymc]

Thanks Alex,

thats great, I shall now have to create some more t3 indicators to see if I can get it to work for me.

Paul.

[buzzhorton]

"The only difference is that in that example I use efsExternal() instead of efsInternal()."

What is the reason you used efsExternal() instead of efsInternal()?

[ACM]

Paul
You are most welcome

buzzhorton
As I explain in that thread I used efsExternal() to illustrate how to create a study by combining multiple EFSs. Here is an excerpt from the thread:
"In this example I will be showing how we can use the efsExternal() function to combine multiple EFSs to create an indicator. Some of the advantages to using the efsExternal() function instead of merging the separate EFS into a single script are that we are less likely to introduce logic or syntax errors due to naming of the variables, incorrect placement of the code, etc and more importantly that it is easier to write the script."

Alex

[pmurraymc]

Have added a Histogram and some color, will post a piccie.

I think efsexternal can wait for a while, I'm having enough fun with efsinternal.

Paul.

[pmurraymc]

Here it is:

[pmurraymc]

Hello again,

have put bollinger bands around the t3 MACD (I love to play with efs).

the results are shown here

http://share.esignal.com/groupconten...ng&groupid=860

They are currently being done with loops for the MA and the standard dev.

I would like to use efs2 and efsinternal, but I get errors (incorrect argument comes up in a window - not written to the efs debugger) and a crash not long after the message is shown.

the code I have added is:

 xSig = ema(3, xMACD); //ACM added - replace 3 with other value or variable
xBBm = middleBB(20, 2, xMACD);
xBBu = upperBB(20, 2, xMACD);
xBBl = lowerBB(20, 2, xMACD); 

followed by

var x3 = getSeries(xBBu); 
var x4 = getSeries(xBBm); 
var x5 = getSeries(xBBl); 

any ideas?

Paul.

[ACM]

Paul
I can duplicate the problem and am looking into it. Once I have some information I will post it here
Alex

[pmurraymc]

Hi Alex,

this is a tricky one, I thought I had done something wrong, glad you can reproduce it, but the BB middle line is only an MA, and the code already uses an MA via efsinternal for the signal line.

Paul.

[ACM]

Paul
From what I can see the problem is caused by the Bollinger functions when these are used with certain series. I have passed on this information to eSignal's developers.
In the mean time you can use the enclosed revision of your script which offers a workaround I have come up with to resolve the issue.
Given that the Bollinger functions seem to accept without problems a moving average as the source I have added a 1 period simple moving average (ie xTemp) to act as a proxy for the xMACD series. At that point all the Bollinger functions can use xTemp as the source without causing any problems. Comments on the changes are included in the script.
Alex

//Alexis C. Montenegro © January 2005                       
//Use and/or modify this code freely. If you redistribute it
//please include this and/or any other comment blocks and a 
//description of any changes you make.   
 
//Paul Murray
//Making a MACD type indicator from a cross of T3 moving averages
 
//ACM - Modified original to create a MACD with Signal line
//ACM - Added BB with temporary workaround
 
// NOTE:                                                                          
// This efs requires amStudies.efsLib in the FunctionLibrary folder.              
// If you do not have this file you can download it at the link below.            
//http://share.esignal.com/groupcontents.jsp?folder=Formulas-Libraries&groupid=10
 
var fpArray = new Array();
 
var lastrawtime = 0;
var BarCount = 0;
 
var grID = 0;  
 
function preMain() {
 
    setPriceStudy(false);
    setStudyTitle("T3 MA 3,5 cross MACD");
    setCursorLabelName("T3_1",0);
    setCursorLabelName("T3_2",1); 
    setCursorLabelName("T3_3_BBu",2); //added by ACM
    setCursorLabelName("T3_3_BBm",3); //added by ACM
    setCursorLabelName("T3_3_BBl",4); //added by ACM
    setDefaultBarFgColor(Color.blue,0);
    setDefaultBarFgColor(Color.red,1); 
    setDefaultBarFgColor(Color.magenta,2); //added by ACM
    setDefaultBarFgColor(Color.magenta,3); //added by ACM
    setDefaultBarFgColor(Color.magenta,4); //added by ACM
    setPlotType(PLOTTYPE_LINE,0);
    setPlotType(PLOTTYPE_INSTANTCOLORLINE,1);
    setDefaultBarThickness(2,0);
    setDefaultBarThickness(2,1);   
 
//    askForInput();
 
    addBand(0, PS_DASH, 3, Color.black);     
 
           
    var x=0;
    fpArray[x] = new FunctionParameter("Length1", FunctionParameter.NUMBER);
 with(fpArray[x++]){
        setLowerLimit(1);  
        setDefault(5);
    }
    fpArray[x] = new FunctionParameter("Length2", FunctionParameter.NUMBER);
 with(fpArray[x++]){
        setLowerLimit(1);  
        setDefault(3);
    }      
    fpArray[x] = new FunctionParameter("Factor", FunctionParameter.NUMBER);
 with(fpArray[x++]){
        setUpperLimit(1); 
        setLowerLimit(0);  
        setDefault(0.7);
    }
 fpArray[x] = new FunctionParameter("Source", FunctionParameter.STRING);
 with(fpArray[x++]){
        addOption("open"); 
        addOption("high");
        addOption("low");
        addOption("close");
        addOption("hl2");
        addOption("hlc3");
        addOption("ohlc4"); 
        setDefault("close"); 
    }
 fpArray[x] = new FunctionParameter("Symbol", FunctionParameter.STRING);
    with(fpArray[x++]){
        setDefault();
 }
 fpArray[x] = new FunctionParameter("Interval", FunctionParameter.STRING);
 with(fpArray[x++]){
        setDefault();
    }
    fpArray[x] = new FunctionParameter("Offset", FunctionParameter.NUMBER);
 with(fpArray[x++]){
        setDefault(0);
    }
    fpArray[x] = new FunctionParameter("Params", FunctionParameter.BOOLEAN);
 with(fpArray[x++]){
        setName("Show Parameters");
        setDefault(false);
    }
 fpArray[x] = new FunctionParameter( "Linecolor1", FunctionParameter.COLOR);
 with( fpArray[x] ) {
  setDefault( Color.blue );
 }      
 fpArray[x] = new FunctionParameter( "Linecolor2", FunctionParameter.COLOR);
 with( fpArray[x] ) {
  setDefault( Color.red );
 }  
 fpArray[x] = new FunctionParameter( "Alerts", FunctionParameter.NUMBER);
 with( fpArray[x] ) {
        setUpperLimit(2); 
        setLowerLimit(1);
  setDefault(2);
 }   
}
 
var amLib = addLibrary("amStudies.efsLib");
 
var bInit = false;
 
var xT31 = null;
var xT32 = null;
var xMACD = null;
var xSig  = null;
var xTemp = null;//added by ACM for temporary workaround
var xBBm = null;//added by ACM
var xBBu = null;//added by ACM
var xBBl = null;//added by ACM
 
var vLastAlert = -1;
var vLastxAlert = -1;
var vLastaAlert = -1;
 

function main(Length1, Length2, Factor, Source, Symbol, Interval, Offset, Params, Linecolor1, Linecolor2, Alerts) {
 
    if(bInit == false){
        with( amLib ) {
        if(Symbol == null) Symbol = getSymbol();
        if(Interval == null) Interval = getInterval();
        var vSymbol = Symbol+","+Interval;
        xT31 = offsetSeries(amT3(Length1, Factor, eval(Source)(sym(vSymbol))), Offset);
        xT32 = offsetSeries(amT3(Length2, Factor, eval(Source)(sym(vSymbol))), Offset);
        xMACD = efsInternal("calcMACD", xT31, xT32); 
        xSig = ema(3, xMACD); 
        xTemp = sma(1,xMACD);//added by ACM as temporary workaround
        xBBm = middleBB(20, 2, xTemp);//added by ACM - uses temporary workaround instead of xMACD
        xBBu = upperBB(20, 2, xTemp);//added by ACM - uses temporary workaround instead of xMACD
        xBBl = lowerBB(20, 2, xTemp);//added by ACM - uses temporary workaround instead of xMACD
        setShowTitleParameters(eval(Params));
        setDefaultBarFgColor( Linecolor1, 0 );
        setDefaultBarFgColor( Linecolor2, 1 );
        bInit = true;
        }
    }
 
    var x1 = getSeries(xMACD); 
    var x2 = getSeries(xSig); 
    var x3 = getSeries(xBBu);//added by ACM
    var x4 = getSeries(xBBm);//added by ACM
    var x5 = getSeries(xBBl);//added by ACM
 
        
    return new Array(x1,x2, x3, x4, x5);
}
  
function gID() {
    grID ++;
    return( grID );
}
 
function calcMACD(avg1,avg2){
    if(avg1.getValue(0)==null || avg2.getValue(0)==null) return;
    return (avg2.getValue(0) - avg1.getValue(0));
} 

[pmurraymc]

Hi Alex,

that is a real nifty solution, thanks, will post the code on my fileshare as well (after replacing my colours on the chart).

Paul.