ema(100) returns nan

[dannydneilsen]

Hello
I am having a strange problem. I have copy/pasted this code because ema(100) returned either null og nan. I decided to copy code already available. When I use ema(10) or ema(50) the code respons as expected, but when I use other values like 150 the code returns with nan? I cant find any logic in this, am I missing something here?

appreciate your help, tx.

Danny Nielsen

/************************************************** ***************
Provided By:
Interactive Data Corporation (Copyright © eSignal) 2010.
All rights reserved. This sample eSignal Formula Script (EFS)
is for educational purposes only. Interactive Data Corporation
reserves the right to modify and overwrite this EFS file with
each new release.
************************************************** ****************/

function preMain() {

setPriceStudy(true);
setStudyTitle("EMA");
setCursorLabelName("EMA",0);
setDefaultBarFgColor(Color.RGB(0x00,0x94,0xFF), 0);
setPlotType(PLOTTYPE_LINE,0);
setDefaultBarThickness(1,0);
}

function main() {

return "::"+ema(10)+"::";
}

[ACM]

Danny
The ema() function [as well as functions for other studies] requires a certain number of bars to be fully primed during which it will not return a value. The number of bars required varies by study and in the case of the ema is equal to its length
Your script is actually not returning a value only on the first nn bars equal to the assigned length. The following two screenshots should illustrate this [note the Bar# and Bar Index values in the Data Window]





It will not return a value for the initial 10 bars also when using ema(10) [see following screenshot] but you just did not notice it
Alex

Hello
I am having a strange problem. I have copy/pasted this code because ema(100) returned either null og nan. I decided to copy code already available. When I use ema(10) or ema(50) the code respons as expected, but when I use other values like 150 the code returns with nan? I cant find any logic in this, am I missing something here?

appreciate your help, tx.

Danny Nielsen

/************************************************** ***************
Provided By:
Interactive Data Corporation (Copyright © eSignal) 2010.
All rights reserved. This sample eSignal Formula Script (EFS)
is for educational purposes only. Interactive Data Corporation
reserves the right to modify and overwrite this EFS file with
each new release.
************************************************** ****************/

function preMain() {

setPriceStudy(true);
setStudyTitle("EMA");
setCursorLabelName("EMA",0);
setDefaultBarFgColor(Color.RGB(0x00,0x94,0xFF), 0);
setPlotType(PLOTTYPE_LINE,0);
setDefaultBarThickness(1,0);
}

function main() {

return "::"+ema(10)+"::";
}

[dannydneilsen]

Hello Alexis, and thanks for you quick reply.

I am programming a function to be used in a column in a watch list, the code is never to be used on charts. How do I setup this watch list function to look back a certain amount of bars?

regards
Danny

Danny
The ema() function [as well as functions for other studies] requires a certain number of bars to be fully primed during which it will not return a value. The number of bars required varies by study and in the case of the ema is equal to its length
Your script is actually not returning a value only on the first nn bars equal to the assigned length. The following two screenshots should illustrate this [note the Bar# and Bar Index values in the Data Window]





It will not return a value for the initial 10 bars also when using ema(10) [see following screenshot] but you just did not notice it
Alex

[ACM]

Danny
You control the number of bars loaded in a Watch List through Time Templates [see this article in the eSignal KnowledgeBase for more information]
Alex

Hello Alexis, and thanks for you quick reply.

I am programming a function to be used in a column in a watch list, the code is never to be used on charts. How do I setup this watch list function to look back a certain amount of bars?

regards
Danny

[dannydneilsen]

Thanks Alex, your a genius. The bars were set to 50, it did help to change the period to beyond 150, thanks again ..
Danny

Danny
You control the number of bars loaded in a Watch List through Time Templates [see this article in the eSignal KnowledgeBase for more information]
Alex

[ACM]

Danny
You are welcome
Alex

Thanks Alex, your a genius. The bars were set to 50, it did help to change the period to beyond 150, thanks again ..
Danny