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**ACM** · 04-27-2010, 03:48 AM

Re: Bug in ARSI.efs?

Steven

I find it useful on all time frames. However, on the daily chart, whenever the markets are closed, it returns an error, and I haven't been able to figure out why.

FWIW at my end it appears to be working on the daily interval of all the symbols I tried [even when these are closed]
Alex

Originally posted by Steven Miller
One of my favorite indicators is the ARSI -- the Asymmetrical RSI that Sylvain Vervoort wrote about in the October 2008 issue of Stocks & Commodities Magazine and that eSignal made available in an EFS script, which I've attached.

I find it useful on all time frames. However, on the daily chart, whenever the markets are closed, it returns an error, and I haven't been able to figure out why.

Can anyone tell me what the problem is? I don't know if the readings it gives on the daily chart are valid.

Steven Miller

**mikejhelms** · 09-23-2010, 11:07 AM

Then the force is with you Alex because ...

I also get an error message when I try to run Veroot’s ARSI study (Link ) in real-time. The message says: “Line 118; Parameter Number 1 of Function ema [Length] is invalid.”

Mike

**ACM** · 09-23-2010, 11:13 AM

Re: Then the force is with you Alex because ...

Mike
As I indicated in my previous reply the formula referenced by the original poster is working at my end (see enclosed screenshot).
Also, based on what I am seeing that formula is not calling the ema() function in line 118
Alex

Originally posted by mikejhelms
I also get an error message when I try to run Veroot’s ARSI study (Link ) in real-time. The message says: “Line 118; Parameter Number 1 of Function ema [Length] is invalid.”

Mike

**mikejhelms** · 09-23-2010, 11:47 AM

It is on my end

The following is the study I just downloaded from the eSignal forum at the aforementioned link. When it's opened in a formula editor line 118 reads:

var xDnMoveAvg = ema((xSum2.getValue(0)*2)-1,xSum4);

But it’s no big deal because I now see the error evaporates if the default number of periods is changed from 14 to 21. Insufficient data loaded I suppose.

Mike

/*********************************
Provided By:
eSignal (Copyright c eSignal), a division of Interactive Data
Corporation. 2008. All rights reserved. This sample eSignal
Formula Script (EFS) is for educational purposes only and may be
modified and saved under a new file name. eSignal is not responsible
for the functionality once modified. eSignal reserves the right
to modify and overwrite this EFS file with each new release.

Description:
ARSI, The Asymmetrical RSI by Sylvain Vervoort

Version: 1.0 08/07/2008

Notes:
October 2008 issue of Stocks & Commodities Magazine

Formula Parameters: Default:
Period 14
Upper Band 70
Lower Band 30
ARSI Color Blue
RSI Color Red
Show Parameters False
**********************************/

var fpArray = new Array();

function preMain() {
setPriceStudy(false);
setStudyTitle("ARSI ");
setCursorLabelName("ARSI", 0);
setCursorLabelName("RSI", 1);

setDefaultBarFgColor(Color.blue, 0);
setDefaultBarFgColor(Color.red, 1);

setPlotType(PLOTTYPE_LINE, 0);
setPlotType(PLOTTYPE_LINE, 1);

setDefaultBarThickness(1, 0);
setDefaultBarThickness(1, 1);

askForInput();

var x=0;
fpArray[x] = new FunctionParameter("Period", FunctionParameter.NUMBER);
with(fpArray[x++]){
setName("Period");
setLowerLimit(1);
setUpperLimit(100);
setDefault(14);
}

fpArray[x] = new FunctionParameter("Color1", FunctionParameter.COLOR);
with(fpArray[x++]){
setName("ARSI Color");
setDefault(Color.blue);
}

fpArray[x] = new FunctionParameter("Color2", FunctionParameter.COLOR);
with(fpArray[x++]){
setName("RSI Color");
setDefault(Color.red);
}

fpArray[x] = new FunctionParameter("Upper", FunctionParameter.NUMBER);
with(fpArray[x++]){
setName("Upper Band");
setLowerLimit(0);
setDefault(70);
}

fpArray[x] = new FunctionParameter("Lower", FunctionParameter.NUMBER);
with(fpArray[x++]){
setName("Lower Band");
setLowerLimit(0);
setDefault(30);
}

fpArray[x] = new FunctionParameter("ShowParam", FunctionParameter.BOOLEAN);
with(fpArray[x++]){
setName("Show Parameters");
setDefault(false);
}

}

var xSum1 = null
var xSum2 = null;
var xSum3 = null;
var xSum4 = null;
var xRSI = null;
var bInit = false;
var bVersion = null;

function main(Period, Upper, Lower, Color1, Color2, ShowParam){

if (bVersion == null) bVersion = verify();
if (bVersion == false) return;
if(getCurrentBarCount()<Period) return;

if(bInit==false){
xSum1 = efsInternal("Sum",Period);
xSum2 = getSeries(xSum1,1);
xSum3 = getSeries(xSum1,2);
xSum4 = getSeries(xSum1,3);
xRSI = rsi(Period);
addBand(Upper,PS_SOLID,1,Color.grey,"UpperBand");
addBand(Lower,PS_SOLID,1,Color.grey,"LowerBand");
setShowTitleParameters( ShowParam );
bInit=true;
}

var xUpMoveAvg = ema((xSum1.getValue(0)*2)-1,xSum3);
var xDnMoveAvg = ema((xSum2.getValue(0)*2)-1,xSum4);

if(xUpMoveAvg==null||xDnMoveAvg==null) return;

var RS = xUpMoveAvg.getValue(0)/xDnMoveAvg.getValue(0);
var nRSI = xRSI.getValue(0);
if(nRSI==null) return;

return new Array (100-(100/(1+RS)),nRSI)
}

var xMom = null;
var xInit = false;

function Sum(Period){

if(xInit==false){
xMom = mom(1);
xInit = true;
}

var nSum = 0;
for(var i = 0; i < Period; i++){
if(xMom.getValue(-i) >= 0) {
nSum += 1;
}
}

var UpCount = nSum;
var DnCount = Period-UpCount;
var UpMove = xMom.getValue(0)>=0?xMom.getValue(0):0;
var DnMove = xMom.getValue(0)<0?Math.abs(xMom.getValue(0)):0;

return new Array(UpCount,DnCount,UpMove,DnMove);
}

function verify() {
var b = false;
if (getBuildNumber() < 779) {
drawTextAbsolute(5, 35, "This study requires version 8.0 or later.",
Color.white, Color.blue, Text.RELATIVETOBOTTOM|Text.RELATIVETOLEFT|Text.BOL D|Text.LEFT,
null, 13, "error");
drawTextAbsolute(5, 20, "Click HERE to upgrade.@URL=http://www.esignal.com/download/default.asp",
Color.white, Color.blue, Text.RELATIVETOBOTTOM|Text.RELATIVETOLEFT|Text.BOL D|Text.LEFT,
null, 13, "upgrade");
return b;
} else {
b = true;
}
return b;
}

**ACM** · 09-23-2010, 11:59 AM

Re: It is on my end

Mike
FWIW also the formula you posted appears to be working fine at my end using 14 as the length of the ema()
Alex

Originally posted by mikejhelms
The following is the study I just downloaded from the eSignal forum at the aforementioned link. When it's opened in a formula editor line 118 reads:

var xDnMoveAvg = ema((xSum2.getValue(0)*2)-1,xSum4);

But it’s no big deal because I now see the error evaporates if the default number of periods is changed from 14 to 21. Insufficient data loaded I suppose.

Mike

/*********************************
Provided By:
eSignal (Copyright c eSignal), a division of Interactive Data
Corporation. 2008. All rights reserved. This sample eSignal
Formula Script (EFS) is for educational purposes only and may be
modified and saved under a new file name. eSignal is not responsible
for the functionality once modified. eSignal reserves the right
to modify and overwrite this EFS file with each new release.

Description:
ARSI, The Asymmetrical RSI by Sylvain Vervoort

Version: 1.0 08/07/2008

Notes:
October 2008 issue of Stocks & Commodities Magazine

Formula Parameters: Default:
Period 14
Upper Band 70
Lower Band 30
ARSI Color Blue
RSI Color Red
Show Parameters False
**********************************/

var fpArray = new Array();

function preMain() {
setPriceStudy(false);
setStudyTitle("ARSI ");
setCursorLabelName("ARSI", 0);
setCursorLabelName("RSI", 1);

setDefaultBarFgColor(Color.blue, 0);
setDefaultBarFgColor(Color.red, 1);

setPlotType(PLOTTYPE_LINE, 0);
setPlotType(PLOTTYPE_LINE, 1);

setDefaultBarThickness(1, 0);
setDefaultBarThickness(1, 1);

askForInput();

var x=0;
fpArray[x] = new FunctionParameter("Period", FunctionParameter.NUMBER);
with(fpArray[x++]){
setName("Period");
setLowerLimit(1);
setUpperLimit(100);
setDefault(14);
}

fpArray[x] = new FunctionParameter("Color1", FunctionParameter.COLOR);
with(fpArray[x++]){
setName("ARSI Color");
setDefault(Color.blue);
}

fpArray[x] = new FunctionParameter("Color2", FunctionParameter.COLOR);
with(fpArray[x++]){
setName("RSI Color");
setDefault(Color.red);
}

fpArray[x] = new FunctionParameter("Upper", FunctionParameter.NUMBER);
with(fpArray[x++]){
setName("Upper Band");
setLowerLimit(0);
setDefault(70);
}

fpArray[x] = new FunctionParameter("Lower", FunctionParameter.NUMBER);
with(fpArray[x++]){
setName("Lower Band");
setLowerLimit(0);
setDefault(30);
}

fpArray[x] = new FunctionParameter("ShowParam", FunctionParameter.BOOLEAN);
with(fpArray[x++]){
setName("Show Parameters");
setDefault(false);
}

}

var xSum1 = null
var xSum2 = null;
var xSum3 = null;
var xSum4 = null;
var xRSI = null;
var bInit = false;
var bVersion = null;

function main(Period, Upper, Lower, Color1, Color2, ShowParam){

if (bVersion == null) bVersion = verify();
if (bVersion == false) return;
if(getCurrentBarCount()<Period) return;

if(bInit==false){
xSum1 = efsInternal("Sum",Period);
xSum2 = getSeries(xSum1,1);
xSum3 = getSeries(xSum1,2);
xSum4 = getSeries(xSum1,3);
xRSI = rsi(Period);
addBand(Upper,PS_SOLID,1,Color.grey,"UpperBand");
addBand(Lower,PS_SOLID,1,Color.grey,"LowerBand");
setShowTitleParameters( ShowParam );
bInit=true;
}

var xUpMoveAvg = ema((xSum1.getValue(0)*2)-1,xSum3);
var xDnMoveAvg = ema((xSum2.getValue(0)*2)-1,xSum4);

if(xUpMoveAvg==null||xDnMoveAvg==null) return;

var RS = xUpMoveAvg.getValue(0)/xDnMoveAvg.getValue(0);
var nRSI = xRSI.getValue(0);
if(nRSI==null) return;

return new Array (100-(100/(1+RS)),nRSI)
}

var xMom = null;
var xInit = false;

function Sum(Period){

if(xInit==false){
xMom = mom(1);
xInit = true;
}

var nSum = 0;
for(var i = 0; i < Period; i++){
if(xMom.getValue(-i) >= 0) {
nSum += 1;
}
}

var UpCount = nSum;
var DnCount = Period-UpCount;
var UpMove = xMom.getValue(0)>=0?xMom.getValue(0):0;
var DnMove = xMom.getValue(0)<0?Math.abs(xMom.getValue(0)):0;

return new Array(UpCount,DnCount,UpMove,DnMove);
}

function verify() {
var b = false;
if (getBuildNumber() < 779) {
drawTextAbsolute(5, 35, "This study requires version 8.0 or later.",
Color.white, Color.blue, Text.RELATIVETOBOTTOM|Text.RELATIVETOLEFT|Text.BOL D|Text.LEFT,
null, 13, "error");
drawTextAbsolute(5, 20, "Click HERE to upgrade.@URL=http://www.esignal.com/download/default.asp",
Color.white, Color.blue, Text.RELATIVETOBOTTOM|Text.RELATIVETOLEFT|Text.BOL D|Text.LEFT,
null, 13, "upgrade");
return b;
} else {
b = true;
}
return b;
}

**mikejhelms** · 09-24-2010, 03:37 PM

Steven’s inserted comments regarding Wilder’s formulation of the RSI increased the line number from the original 118 to 125 for “var xDnMoveAvg = ema((xSum2.getValue(0)*2)-1,xSum4)”. And although eSignal’s original study defines RS, nRSI, xUpMoveAvg and xDnMoveAvg as local variables Steven defines them globally which was probably, as Martha Stewart says, “A good thing” because I had no problem with his version of the study. Why I had problems with the original remains a mystery.

Mike

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Bug in ARSI.efs?

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