# Java formula Esignal

#### chump

##### Senior member
2,212 274
All I know about programming is what I can see on the remote control for the TV so I am looking for some help.

Basically I want to adapt the ema formulas in esignal to create the ability to period shift emas (offset emas). Esignal use java and I assume this is not coffee they are talking about.

If anyone is will ing to help I can do a cut and paste of the ema formula in esignal for you to adapt.

Not being lazy, just each to there own and I would have to start learning this stuff from scratch which is a bit tedious given my needs.

Cheers

#### FTSE Beater

##### Experienced member
1,518 5
Hi Chump

It shouldn't be too difficult. If you would be kind enough to post up the formula, I'll have a look at it for you.
Are you trying to display the lines or use the values in some kind of formula

#### chump

##### Senior member
2,212 274
FT,
Thanks for your offer of help.Much appreciated.This is the formula for a 15ema in esignal. I am trying to find out how to adapt this so that I can move/offset the ema either backwards or forwards say x periods where x can be 3 or any number for that matter.

function preMain() {
setPriceStudy(true);
}

var dLastMA = 0.0;
var dThisMA = 0.0;
var dPercent = 0.0;
var dCount = 0;
var bPrimed = false;

function main(nInputLength) {
if(nInputLength == null)
nInputLength = 15;

var nBarState = getBarState();
var i;
var dValue;
var dSum = 0.0;

if(nBarState == BARSTATE_ALLBARS) {
// reset!
dPercent = (2.0 / (nInputLength + 1.0));
dLastMA = 0.0;
dThisMA = 0.0;
dCount = 0;
}

if(nBarState == BARSTATE_NEWBAR) {
dLastMA = dThisMA;
}
dThisMA = dLastMA;

if(bPrimed == false) {
dValue = getValue("Close", 0, -nInputLength);
if(dValue == null)
return;

for(i = 0; i < nInputLength; i++) {
dSum += dValue;
}

dLastMA = dSum / nInputLength;
dThisMA = dLastMA;

bPrimed = true;
} else {
dValue = getValue("Close");
if(dValue == null)
return;

dThisMA = (dValue - dLastMA) * dPercent + dLastMA;
}

return dThisMA;

}

Cheers

#### FTSE Beater

##### Experienced member
1,518 5
Hi Chump

I've had a look at it, and this is what I've come up with

function preMain() {
setPriceStudy(true);
}

var dLastMA = 0.0;
var dThisMA = 0.0;
var dPercent = 0.0;
var dCount = 0;
var bPrimed = false;

function main(nInputLength) {
if(nInputLength == null)
nInputLength = 15;

var nBarState = getBarState();
var i;
var dValue;
var dSum = 0.0;

if(nBarState == BARSTATE_ALLBARS) {
// reset!
dPercent = (2.0 / (nInputLength + 1.0));
dLastMA = 0.0;
dThisMA = 0.0;
dCount = 0;
}

if(nBarState == BARSTATE_NEWBAR) {
dLastMA = dThisMA;
}
dThisMA = dLastMA;

if(bPrimed == false) {
dValue = getValue("Close", 0, -nInputLength);
if(dValue == null)
return;

for(i = 0; i < nInputLength; i++) {
dSum += dValue;
}

dLastMA = dSum / nInputLength;
dThisMA = dLastMA;

bPrimed = true;
} else {
dValue = getValue("Close",10);
if(dValue == null)
return;

dThisMA = (dValue - dLastMA) * dPercent + dLastMA;
}

return dThisMA;

}

The only bit I added was the bit in red above. You'll have to turn that into a variable, which I can't remember how to do

HTH

#### chump

##### Senior member
2,212 274
Ft,
Thanks for the help. I will give it a try and see what it looks like.

Cheers

#### JayF_eSignal

##### Member
54 0
Just a quick note that if you need further assistance on that EFS, you may want to post a query at eSignal Central's EFS Studies Forum.

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