How many times is sym(xx) passed when main passes it to an efsInt that calls another

[waynecd]

Hi,

Does an internal function [function bb()] called by another internal function [function aa()] inherit the sym() passed by main()?
And does a series calculation based on the called internal function (bb) also inherit the sym() passed by main()?

Hopefully the questions are clearer when commented in the sample script below.

var Study = null;
var bInit = false;

function main(){

    if(!bInit){
         Symbol = getSymbol();
         Interval = getInterval();
         var xSymbol = Symbol+","+Interval;
         study = efsInternal("aa",sym(xSymbol));
         bInit=true;       
    }
...
}

function aa(){
    xTR = efsInternal("bb");//Does "function aa()" pass "sym(xSymbol)" to "function bb()"?
    xAvgTR = ema(MALength, xTR);//is "xAvgTR" calculated based on "sym(xSymbol) since "xAvgTR is based on "function bb()"?
}
function bb(){//if "sym(xSymbol)" is not passed how do I make sure the whole script is based on the desired symbol and interval?
    return (high(0)-low(0));
} 

I don't know how to test for this andn othing I've tried so far clears this up for me.

Thanks in advance.

Wayne

[Guest]

Re: How many times is sym(xx) passed when main passes it to an efsInt that calls another

Hi Wayne,

I rewrote the efs and marked it up such that it can be used as a reference. Alex has a great tutorial thread on internal series and efsInternal which is much better than I could put together.

The modified efs I enclosed is more a tutorial to demonstrate efsinternal execution flow in addition to demonstrating several related concepts. I also saved the efs to my Functions fileShare here.


I hope this helps.

Originally posted by waynecd
Hi,

Does an internal function [function bb()] called by another internal function [function aa()] inherit the sym() passed by main()?
And does a series calculation based on the called internal function (bb) also inherit the sym() passed by main()?

Hopefully the questions are clearer when commented in the sample script below.

var Study = null;
var bInit = false;

function main(){

    if(!bInit){
         Symbol = getSymbol();
         Interval = getInterval();
         var xSymbol = Symbol+","+Interval;
         study = efsInternal("aa",sym(xSymbol));
         bInit=true;       
    }
...
}

function aa(){
    xTR = efsInternal("bb");//Does "function aa()" pass "sym(xSymbol)" to "function bb()"?
    xAvgTR = ema(MALength, xTR);//is "xAvgTR" calculated based on "sym(xSymbol) since "xAvgTR is based on "function bb()"?
}
function bb(){//if "sym(xSymbol)" is not passed how do I make sure the whole script is based on the desired symbol and interval?
    return (high(0)-low(0));
} 

I don't know how to test for this andn othing I've tried so far clears this up for me.

Thanks in advance.

Wayne

//~ DEMO CONCEPTS EFS ==>> EFSINTERNAL EXECUTION FLOW
//~ The efs returns an exponential moving average of the price range ((high(0) - low(0)) and has extensive debug output
//~ Written by Steve Hare 6/4/2010

//~ NOTE:  much of the code and the majority of the concepts in this efs are discussed and demonstrated  quite thoroughly in the following 
//~ thread ==>> 'http://forum.esignalcentral.com/showthread.php?s=&threadid=12752' 

//~ This efs was written in response to a question in this thread ==>>  'http://forum.esignalcentral.com/showthread.php?s=&threadid=33639'
//~ I didn't address the timeframe and symbol questions because they are discussed in the first referenced thread (12752)
//~ However, I did show how to determine the timeframe and symbols in every function and potential timeframe
//~ I saved a copy in this folder ==>> 'http://share.esignal.com/groupcontents.jsp?folder=Demo%20Concepts&groupid=339'

//~ I identified via comments several concepts in the efs.  They are described as best I can below:
//~ ********************************************* 

//~ CONCEPT 1:
//~ - 'http://www.wait-till-i.com/2007/11/27/javascript-shortcut-notations-that-shouldnt-be-black-magic-to-the-average-developer/'
//~ - 'http://dev.opera.com/articles/view/javascript-best-practices/'

//~ CONCEPT 2: Simple technique using setGlobalValue() and getGlobalValue() to keep track of efs function execution calls and their flow 

//~ CONCEPT 3: Another technique that can be used anywhere to determine timeframe and symbol

//~ CONCEPT 4: getSeries() must be used to expose external series 
//~ - 'http://forum.esignalcentral.com/showthread.php?s=&threadid=12752' 
//~ - 'http://forum.esignalcentral.com/showthread.php?s=&threadid=29145'
//~ I recommend uncommented and re-commenting the steps marked with CONCEPT 4, note the first uncommented return statement skips the rest

//~ CONCEPT 5: using efsInternal() creates a new copy of all global objects and keeps them private
//~ - 'http://forum.esignalcentral.com/showthread.php?s=&postid=72994#post72994'

//~ CONCEPT 6: The use of this conditional was used it to keep track of efs function execution and limit debug output to once

//~ CONCEPT 7: 
//~ I used this debugPrintln statement for troubleshooting.  I left it there so it can be un-commented .
//~ More often than not, code does not work as expected the first time through (quite an understatement for some of my code)
//~ I recommend that anyone using this efs to uncommented it and re-comment to understand the sequencing
//~ Also note how I constructed the debugPrintln statements, using function identifiers and numerical references, this works well for me and am passing it along 
//~ debugPrintln output goes to a file in the eSignal folder ==>> \eSignal\formulaoutput.log  I have a shortcut to the file on my desktop and highly recommend it

//~ CONCEPT 8: The postMain() function is called when you close or reload the efs.  I used it to reset the global variable used in CONCEPT 2:

//~ ********************************************* 

//~ Finally, check out the links in my user signature block .  There are links to a number of excellent efs2 tutorial threads in addition to other handy efs references.
//~ There is also a copy of these links in my FileShare. as well. ==>> 'http://share.esignal.com/groupcontents.jsp?groupid=339'

//~ a copy of the debug output is listed below the efs

var nHL = null;
var xAvgTR=null;
var bInit = false;

var wCount=getGlobalValue("wCount")||0; //~ if null or zero, set to 0  //~ CONCEPT 1
setGlobalValue("wCount",wCount);  //~ CONCEPT 2
debugPrintln("");
var wCount=getGlobalValue("wCount");   debugPrintln("global.1: step executed, global.bInit ==>> "+bInit+", wCount = "+wCount);  //~ CONCEPT 2
debugPrintln("global.2: getSymbol() = "+getSymbol()+", getInterval() = "+getInterval()+", wCount = "+wCount); //~ CONCEPT 3
debugPrintln("");

function preMain() {
 //~ setPriceStudy(true);
 setPriceStudy(false);
 setShowCursorLabel(true);
 setStudyTitle("efsInternal execution flow");
 }

function main(MALength) {
  if (!bInit) {
  MALength=MALength||10; //~ if null, undefined false or zero, set to 10  //~ CONCEPT 1
  var wCount=getGlobalValue("wCount");   debugPrintln("mn.1: step executed, mn.bInit ==>> "+bInit+", wCount = "+wCount+", MALength = "+MALength);  //~ CONCEPT 2
  wCount++;    debugPrintln("mn.2: step executed, mn.bInit ==>> "+bInit+", wCount = "+wCount);  // ~CONCEPT 2
  setGlobalValue("wCount",wCount);    debugPrintln("mn.3: step executed, mn.bInit ==>> "+bInit+", wCount = "+wCount);  // ~ CONCEPT 2
  debugPrintln("mn.4: getSymbol() = "+getSymbol()+", getInterval() = "+getInterval()); //~ CONCEPT 3
    nHL = efsInternal("range");    debugPrintln("mn.6: step executed, mn.bInit ==>> "+bInit+", wCount = "+wCount);  // ~ 
  //~ nHL=getSeries(nHL);  //~ CONCEPT 4 
    if(nHL==null){return null;}
  xAvgTR = ema(MALength,nHL); debugPrintln("mn.7: step executed, mn.bInit ==>> "+bInit+", wCount = "+wCount);  // ~ 
  //~ xAvgTR=getSeries(xAvgTR);    debugPrintln("mn.8: step executed, mn.bInit ==>> "+bInit+", wCount = "+wCount);  // ~   //~ CONCEPT 4 
  if(xAvgTR==null){return null;}
  bInit = true;    debugPrintln("mn.9: step executed, mn.bInit ==>> "+bInit+", wCount = "+wCount);  
  debugPrintln("");
  }
 return xAvgTR.getValue(0); //~ CONCEPT 4 
 //~ return xAvgTR;  //~ CONCEPT 4 
 //~ return nHL;  //~ CONCEPT 4 
}
 
function range() { //~ [url]http://forum.esignalcentral.com/showthread.php?s=&threadid=12752[/url] 
 if (!bInit) {//~ CONCEPT 5 ~  //~ CONCEPT 6 
  var wCount=getGlobalValue("wCount");    debugPrintln("range.1: step executed, range.bInit ==>> "+bInit+", wCount = "+wCount);  //~ CONCEPT 2
  wCount++;    debugPrintln("range.2: step executed, range.bInit ==>> "+bInit+", wCount = "+wCount);  //~ CONCEPT 2
  setGlobalValue("wCount",wCount);    debugPrintln("range.3: step executed, range.bInit ==>> "+bInit+", wCount = "+wCount);  //~ CONCEPT 2
  debugPrintln("range.4: getSymbol() = "+getSymbol()+", getInterval() = "+getInterval());  //~ CONCEPT 3
  bInit = true;     debugPrintln("range.5: step executed, range.bInit ==>> "+bInit+", wCount = "+wCount);   //~ CONCEPT 5 
  debugPrintln("");
  }
 //~ debugPrintln("range.6:  (high(0) - low(0)) ==>> "+(high(0) - low(0)));   //~ CONCEPT 7 
 return (high(0) - low(0));
}

function postMain(){
 setGlobalValue("wCount",null); //~  set to null if reloaded  //~ CONCEPT 8 
}

//~ DEBUG OUTPUT FROM THIS EFS, COPIED FROM THIS FILE IN THE ESIGNAL FOLDER ==>> \ESIGNAL\FORMULAOUTPUT.LOG 

//~ global.1: step executed, global.bInit ==>> false, wCount = 0
//~ global.2: getSymbol() = ES #F, getInterval() = 5, wCount = 0

//~ mn.1: step executed, mn.bInit ==>> false, wCount = 0, MALength = 10
//~ mn.2: step executed, mn.bInit ==>> false, wCount = 1
//~ mn.3: step executed, mn.bInit ==>> false, wCount = 1
//~ mn.4: getSymbol() = ES #F, getInterval() = 5

//~ global.1: step executed, global.bInit ==>> false, wCount = 1
//~ global.2: getSymbol() = ES #F, getInterval() = 5, wCount = 1

//~ range.1: step executed, range.bInit ==>> false, wCount = 1
//~ range.2: step executed, range.bInit ==>> false, wCount = 2
//~ range.3: step executed, range.bInit ==>> false, wCount = 2
//~ range.4: getSymbol() = ES #F, getInterval() = 5
//~ range.5: step executed, range.bInit ==>> true, wCount = 2

//~ mn.1: step executed, mn.bInit ==>> false, wCount = 2, MALength = 10
//~ mn.2: step executed, mn.bInit ==>> false, wCount = 3
//~ mn.3: step executed, mn.bInit ==>> false, wCount = 3
//~ mn.4: getSymbol() = ES #F, getInterval() = 5
//~ mn.6: step executed, mn.bInit ==>> false, wCount = 3
//~ mn.7: step executed, mn.bInit ==>> false, wCount = 3
//~ mn.9: step executed, mn.bInit ==>> true, wCount = 3 

[waynecd]

Hi Steve,

In addition to the code, your comments, concepts, and links were also extremely useful.

I also appreciate the way you explain the use of global variables for tracking code execution.

//~ More often than not, code does not work as expected the first time through (quite an understatement for some of my code)

Ref: quote - you have no idea how true that statement is for me as well.

A million thanks to you and Alex.

Wayne

[Guest]

Hi Wayne,

Your most welcome, appreciate the nice note.

Steve