Indicator on C-L

[gautama2]

Hello,

i want to make a plot of the Linear Regression function applied on C-L.
Not on the Close or the high etc.

How can i do this with Formula Wizard. I can only choose OHLC and if i try to change the formula by putting it into the code by hand, then it gives error message.

Thank you in advance.

Robert

[eSignal_JasonK]

Hello Robert,

Unfortunately, the limitations of the Formula Wizard will not allow you to create this study. This will have to be done in the EFS Editor.

With our latest EFS2 capabilities, this type of study is fairly simple to create. Prior to EFS2 this process would have been a couple hundred lines of code.

What you do is create a series based on the C-L. Then you can pass that series as the source for the LR studies. To turn the C-L into a series you just put that calculation into it's own function and then assign it to a global variable through an efsInternal() call. Then you pass that global variable (xCL in the code example below) to the source parameter of the middleLinearReg() study for example. Try the following.

function preMain() {
    //setPriceStudy(true);
    setStudyTitle("test");
    setCursorLabelName("LR", 0);
    setCursorLabelName("CL", 1);
    setDefaultBarThickness(2, 0);    
    setDefaultBarThickness(2, 1);    
    setPlotType(PLOTTYPE_HISTOGRAM, 1);
    setDefaultBarFgColor(Color.blue, 0);
    setDefaultBarFgColor(Color.grey, 1);
}

var xCL     = null;
var xLRofCL = null;
var bInit   = false;

function main() {
    if (bInit == false) {
        // initialize series at start up
        xCL     = efsInternal("calcCL");
        xLRofCL = middleLinearReg(10, 1, xCL);
        bInit = true;
    }
    
    var nLR = xLRofCL.getValue(0);
    var nCL = xCL.getValue(0);
    
    return new Array(nLR, nCL);
}


function calcCL() {
    return close(0) - low(0);
} 

[gautama2]

Thank you Jason.

I tried your formula, but i get error message in the line with the function call

xCL = efsInternal("calcCL";

saying "Formula File not found".

But i copied the whole thing including function calcCL .

[eSignal_JasonK]

Hello Robert,

Looks like you may just be missing the close parenthesis at the end of the efsInternal call and before the semicolon.

xCL = efsInternal("calcCL");

If that does not solve the problem, attach your formula and I'll take a look.

[gautama2]

Hi Jason,

the parenthesis is there.

BUT:
when i started eSignal again, and opened the formula with the editor i did not get the error message anymore.

Now the formula works well.
Thank you very much.

Regards
Robert

[eSignal_JasonK]

You're most welcome.

[gautama2]

Hello Jason,

one more question:
i want to get the plots of middlelinearreg not only for the last period-bars but for all bars. For every bar in the past the linearreg calculated i.e. over the 9 bar period.

How can i do this?
I attached the formulafile i created after your example and would like to see the lines under all bars not only the last 9 bars.

Regards
Robert

[eSignal_JasonK]

Hello Robert,

To get the moving linear regression line, we cannot use the built-in studies. We have to code the LR calculation and base it on the xCL series. Alex had posted an LR study in one of his threads, How easy are studies on studies in EFS2?. The code below uses his main() from the LR.efs as the movingLR() series. The only difference is that we're replacing the source for the function with the xCL series. Try it out.

function preMain() {
    //setPriceStudy(true);
    setStudyTitle("test");
    setCursorLabelName("LR", 0);
    setCursorLabelName("CL", 1);
    setDefaultBarThickness(2, 0);    
    setDefaultBarThickness(2, 1);    
    setPlotType(PLOTTYPE_HISTOGRAM, 1);
    setDefaultBarFgColor(Color.blue, 0);
    setDefaultBarFgColor(Color.grey, 1);
}

var xCL     = null;
var xLRofCL = null;
var xMovLR  = null;
var bInit   = false;

function main() {
    if (bInit == false) {
        // initialize series at start up
        xCL     = efsInternal("calcCL");
        xLRofCL = middleLinearReg(10, 1, xCL);
        xMovLR  = efsInternal("movingLR", 10, xCL);
        bInit = true;
    }
    
    var nMovLR = xMovLR.getValue(0);
    var nCL = xCL.getValue(0);
    
    return new Array(nMovLR, nCL);
}


function movingLR(length,source) { 
    if(length==null) length = 10;
    //if(source==null) source = efsInternal("calcCL");
    //else source = eval(source);//see Notes in the IE/2 script
    
    var sum = 0;
    if (source.getValue(-(length)) == null){
        return;
    }
    for (var i=length; i>0; i--){
        sum += (i-(length+1)/3)*source.getValue(i-(length)); 
    }
    var LR = 6/(length*(length+1))*sum;
    return (LR);
}


function calcCL() {
    return close(0) - low(0);
} 

[gautama2]

Thank you Jason.
Exactly what i needed.
Now the indicator works well even with Tickreplay. Great.

Regards
Robert

[eSignal_JasonK]

You're most welcome.