MA on Positive Volume Index and on Negative Volume Index

[KONSTANTINIDIS]

How can I put MA on Negative Volume Index and on Negative Volume Index?

[ACM]

KONSTANIDIS
With eSignal 7.9 and using the new EFS2 functions you can do that with the example enclosed below. You will need to insert in the marked space the calculations required for the Positive Volume Index or Negative Volume Index
For information on EFS in general you may want to read through the EFS KnowledgeBase. For EFS2 specific functions see the EFS2 Function Reference available at the same link or by clicking the Help icon in the Formula Editor
Alex

function preMain() {
    setPriceStudy(false);
    setStudyTitle("MA of PVI");
    setCursorLabelName("PVI",0);
    setCursorLabelName("MAofPVI",1);
    setDefaultBarFgColor(Color.blue, 0);
    setDefaultBarFgColor(Color.red, 1);
}

function main(Length){

    if(Length==null) Length = 10;
    
    var PVI = efsInternal("calcPVI");
    var MAofPVI = sma(Length,PVI);
    
    return new Array (PVI,MAofPVI);
}

function calcPVI(){

//insert here the code to calculate the PVI or NVI

    return ;//insert here the returned value of PVI or NVI
} 

[KONSTANTINIDIS]

Thank you for your answer.
I do not unsterstand what should I insert at the returned value of PVI or NVI.

For clarity I send you the whole formula:

function preMain() {
setPriceStudy(false);
setStudyTitle("MA of PVI");
setCursorLabelName("PVI",0);
setCursorLabelName("MAofPVI",1);
setDefaultBarFgColor(Color.blue, 0);
setDefaultBarFgColor(Color.red, 1);
}

function main(Length){

if(Length==null) Length = 10;

var PVI = efsInternal("calcPVI");
var MAofPVI = sma(Length,PVI);

return new Array (PVI,MAofPVI);
}

function calcPVI(){

var vPVI = 1;

function preMain() {

setStudyTitle("Positive Volume Index");
setCursorLabelName("PVI");
}

function main() {

var vBarState = getBarState();

if (vBarState == BARSTATE_NEWBAR) {

// get data
var vCurVolume = volume(-1);
var vPrevVolume = volume(-2);
var vCurClose = close(-1);
var vPrevClose = close(-2);

// validate date
if (vCurVolume == null) return;
if (vPrevVolume == null) return;
if (vCurClose == null) return;
if (vPrevClose == null) return;


if (vCurVolume > vPrevVolume) {

var vValue = ( (vCurClose - vPrevClose) / vPrevClose) * vPVI;
vPVI += vValue;
}

}
return vPVI;

}

return ; //insert here the returned value of PVI or NVI
}

[ACM]

KONSTANTINIDIS
In the marked section you would insert only the part of code that actually computes the PVI (or NVI). Also if in the original script there are global variables (ie outside of function main() such as for example var vPVI = 1) then these need to be placed outside of the function (in this case outside of function calcPVI()
Enclosed below is the revised script which you can use as an example to write the MA of NVI (or moving averages or other studies)
Alex

function preMain() {
    setPriceStudy(false);
    setStudyTitle("MA of PVI");
    setCursorLabelName("PVI",0);
    setCursorLabelName("MAofPVI",1);
    setDefaultBarFgColor(Color.blue, 0);
    setDefaultBarFgColor(Color.red, 1);
}

function main(Length){

    if(Length==null) Length = 10;
    
    var PVI = efsInternal("calcPVI");
    var MAofPVI = sma(Length,PVI);
    
    return new Array (PVI,MAofPVI);
}

var vPVI = 1;

function calcPVI(){

    var vBarState = getBarState();

    // get data
    var vCurVolume = volume(-1);
    var vPrevVolume = volume(-2);
    var vCurClose = close(-1);
    var vPrevClose = close(-2);

    // validate date
    if (vCurVolume == null || vPrevVolume == null || vCurClose == null || vPrevClose == null) return;
        
    if (vBarState == BARSTATE_NEWBAR) {

        if (vCurVolume > vPrevVolume) {
            var vValue = ( (vCurClose - vPrevClose) / vPrevClose) * vPVI;
            vPVI += vValue;
        }
    }
    
    return vPVI;
} 

[KONSTANTINIDIS]

Dear Alex,

Thank you so much! It was a plessure to work with you!
Chris

[ACM]

Chris
You are most welcome
Alex