Need Help with Diff between two MAs - NOT MACD

[iberenhaus]

I would like to plot the difference between two EMAs - one is based on bar open and the other is based on bar close (which is why I can't use the MACD). I would actually like to calculate two differences - one based on a pair of 8 Bar EMA (one Open, one Close) and the other based on a pair of 13 bar EMA (one Open, one Close).

I am not using variables in the efs (just to keep it simple). The number of bars is being hardwired in for both pairs.

I would like to plot horizontal lines at 3 cents difference and 6 cents difference on both sides of the zero line. I'm multiplying by 100 to work with whole numbers rather than hundredths.

I've pieced something together based on looking at a dozen or so efs files. I'm unfamiliar with the syntax and am probably making some obvious errors.

I have managed to plot the four reference lines. I don't really understand the relationship between a Study and a Variable. Iialso don't understand how to make the efs show the values.

I could probably work on this for days and still might not figure it out.

The code I came up with is attached in a Word document. i couldn't figure out how to copy and paste the code into the post. Other people have done it - there's a way to do this that I'm unaware of.

Ii would certainly appreciate your help.

Ira
[email protected]

[ACM]

Re: Need Help with Diff between two MAs - NOT MACD

Ira
Enclosed below is a corrected version of your script (with some brief comments on the changes made) .
If you are new to programming in efs and are interested in learning more about it you may want to review the JavaScript for EFS video series and the Core JavaScript Reference Guide. Those will provide you with a thorough introduction to programming in JavaScript which is at the foundation of EFS. Then go through the EFS KnowledgeBase and study the Help Guides and Tutorials which will provide you with the specifics of EFS.
If at any time you have specific programming questions post them in this forum and someone will try to assist you
Alex

addBand(6, PS_SOLID, 1, Color.black, "upper6")
addBand(3, PS_SOLID, 1, Color.black, "upper3")
addBand(-6, PS_SOLID, 1, Color.black,"lower6")
addBand(-3, PS_SOLID, 1, Color.black, "lower3")

function preMain()
{
    setStudyTitle("MA Diff");
    setCursorLabelName("Diff 8", 0);
    setCursorLabelName("Diff 13", 1);
    setDefaultBarFgColor(Color.blue, 0);
    setDefaultBarFgColor(Color.red, 1);
    setDefaultBarThickness(2, 0);
    setDefaultBarThickness(2, 1);
    
    setStudyMax(15);
    setStudyMin(-15);
}

var Cema8 = null;
var Oema8 = null;
var Cema13 = null;
var Oema13 = null;
//var diff8 = null;//removed as not required
//var diff13 = null;//removed as not required
var bInit=false;

function main ()
{
    var myCema8;
    var myOema8
    var myCema13;
    var myOema13;
    var mydiff8;
    var mydiff13;

    if ( bInit == false ) {//replaced {} brackets with () parenthesis
        Cema8 = ema(8, close());//removed 0 from close(0) close() is now a series as required by the ema() function
        Oema8 = ema(8, open());//removed 0 from open(0) as per above comment
        Cema13 = ema(13, close());//removed 0 from close(0) as per above comment also changed length of ema
        Oema13 = ema(13, open());//removed 0 from open(0) as per above comment 
        //diff8 = (Cema8 - Oema8)*100;//this needs to be calculated outside of bInit routine
        //diff13 = (Cema13 - Oema13)*100;//as above
        bInit = true;
    }
    //{//removed { bracket
        
    myCema8 = Cema8.getValue(0);
    myOema8 = Oema8.getValue(0);
    myCema13 = Cema13.getValue(0);
    myOema13 = Oema13.getValue(0);
    
    if(myCema8==null || myOema8==null || myCema13==null || myOema13==null) return;//added null check on the values
        
    mydiff8 = (myCema8 - myOema8)*100;//removed the .getValue(0) methods 
    mydiff13 = (myCema13 - myOema13)*100;//as above
    
    //mydiff8 = diff8.getValue(0);//removed as not required also diff8 is not a series so cannot use getValue() method
    //mydiff13 = diff13.getValue(0);//as above

    return new Array ( mydiff8, mydiff13 );
} 

Originally posted by iberenhaus
I would like to plot the difference between two EMAs - one is based on bar open and the other is based on bar close (which is why I can't use the MACD). I would actually like to calculate two differences - one based on a pair of 8 Bar EMA (one Open, one Close) and the other based on a pair of 13 bar EMA (one Open, one Close).

I am not using variables in the efs (just to keep it simple). The number of bars is being hardwired in for both pairs.

I would like to plot horizontal lines at 3 cents difference and 6 cents difference on both sides of the zero line. I'm multiplying by 100 to work with whole numbers rather than hundredths.

I've pieced something together based on looking at a dozen or so efs files. I'm unfamiliar with the syntax and am probably making some obvious errors.

I have managed to plot the four reference lines. I don't really understand the relationship between a Study and a Variable. Iialso don't understand how to make the efs show the values.

I could probably work on this for days and still might not figure it out.

The code I came up with is attached in a Word document. i couldn't figure out how to copy and paste the code into the post. Other people have done it - there's a way to do this that I'm unaware of.

Ii would certainly appreciate your help.

Ira
[email protected]

[iberenhaus]

Alex,

I just received the email that you responded. Thank you so much. I really appreciate your help.

Thanks,

Ira

[iberenhaus]

Thank you

Alex:

It worked like a charm.

I'm thrilled. As you can see I was only able to get part of the way there, but you figured out exactly what I wanted to do.

Thanks again,

Ira

[ACM]

Ira
You are most welcome
I am glad to hear that it worked and that I was able to be of help.
Alex

Originally posted by iberenhaus
Alex:

It worked like a charm.

I'm thrilled. As you can see I was only able to get part of the way there, but you figured out exactly what I wanted to do.

Thanks again,

Ira