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RE: [amibroker] Intraday data chart



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Thank 
you Tomasz, a good explanation... however, my question wasn't answered. In an 
attempt to get my code working with QuickAFL-On I spend several hours 
trimming several hundred complex (for me) lines of code in such a way 
that the error msg kept occurring, i.e. try to pinpoint the error causing 
statements. I narrowed it down to the use of <SPAN 
class=437230100-23072004><SPAN 
class=640583423-22072004><FONT face=Arial color=#0000ff 
size=2>SelectedValue(Barindex()) and LastValue(Barindex()). In code 
using QuickAFL ON and use SetBarsRequired() these statements generate 
an error message. Does this mean we cannot use these statements in 
QuickAFL?
<SPAN 
class=640583423-22072004> 
<SPAN 
class=640583423-22072004>best regards,
<SPAN 
class=640583423-22072004>herman.

  <FONT face=Tahoma 
  size=2>-----Original Message-----From: Tomasz Janeczko 
  [mailto:amibroker@xxxxxx]Sent: Thursday, July 22, 2004 7:45 
  PMTo: amibroker@xxxxxxxxxxxxxxxSubject: Re: [amibroker] 
  Need help with SetBarsRequired...Importance: 
  High
  Herman,
   
  Short story:
  Your code does NOT really need index addressing, 
  setbarsrequired, barindex at all.
  Somehow you managed to complicate thing 
  when it is very, very simple and can be coded in 2 lines:
  MyCustomArray = EMA(C,3); Title = 
  "NumberFromMyCustomIndicator ="+NumToStr(MyCustomArray ,1.2);
  <FONT face=Arial 
  size=2> 
  Long 
  story:
   
  Take a look at picture below:
   
  
  <TABLE  cellSpacing=0 
  cellPadding=0 width=529 border=0 x:str>
    
    <COL  
    width=97>
    <COL  
    width=32>
    <COL  
    width=28>
    <COL  
    width=31>
    <COL  
    width=28>
    <COL  
    width=30>
    <COL  
    width=32>
    <COL  
    width=29>
    <COL  
    width=37>
    <COL  
    width=36>
    <COL  
    width=35>
    <COL  
    width=40>
    <COL  
    width=32>
    <COL  
    width=42>
    
    
      <TD class=xl24 
       
      width=97 height=17>Bar Index
      <TD class=xl24 
       
      align=right width=32 x:num>0
      <TD class=xl24 
       
      align=right width=28 x:num>1
      <TD class=xl24 
       
      align=right width=31 x:num>2
      <TD class=xl24 
       
      align=right width=28 x:num>3
      <TD class=xl24 
       
      align=right width=30 x:num>4
      <TD class=xl24 
       
      align=right width=32 x:num>5
      <TD class=xl24 
       
      align=right width=29 x:num>6
      <TD class=xl24 
       
      align=right width=37 x:num>7
      <TD class=xl26 
       
      align=right width=36 x:num>8
      <TD class=xl24 
       
      align=right width=35 x:num>9
      <TD class=xl24 
       
      align=right width=40 x:num>10
      <TD class=xl24 
       
      align=right width=32 x:num>11
      <TD class=xl24 
       
      align=right width=42 x:num>12
    
      <TD class=xl25 
       
      height=17>Array element
      <TD 
      ><FONT 
        face="Arial CE" size=2>
      <TD 
      ><FONT 
        face="Arial CE" size=2>
      <TD 
      ><FONT 
        face="Arial CE" size=2>
      <TD 
      ><FONT 
        face="Arial CE" size=2>
      <TD class=xl25 
       
      align=right x:num>0
      <TD class=xl25 
       
      align=right x:num>1
      <TD class=xl25 
       
      align=right x:num>2
      <TD class=xl25 
       
      align=right x:num>3
      <TD class=xl26 
       
      align=right x:num>4
      <TD class=xl25 
       
      align=right x:num>5
      <TD 
      >
      <TD 
      >
      <TD 
      >
   
   
  You see: Bar index represents ENTIRE data set you 
  have.
  Array may be actually smaller than your entire 
  data set (if visible area for indicator is small) and
  may have LESS elements than entire data set you 
  have.
  Array in indicator builder when QuickAFL is on 
  may include only visible part (plus some extra bars).
   
  Now selected bar is shown with red color. As you 
  can see although it has a bar index of 8,
  the actual array element has the number of 
  4.
   
  That's why you can not use barindex to address 
  your arrays directly.
   
  Instead use SelectedValue directly on array, by 
  simply typing:
   
  MyCustomArray = 
  EMA(C,3); NumberFromMyCustomIndicator = SelectedValue( 
  MyCustomArray );
   
  It is way simpler than your code 
  and works always and you do not need to bother about quickafl and 
  setbarsrequired at all.
   
  In fact NumToStr already performs "selected 
  value" so you code can be simplified to 2 lines:
  
   
  MyCustomArray = EMA(C,3); Title = 
  "NumberFromMyCustomIndicator ="+NumToStr(MyCustomArray 
  ,1.2);
  <FONT face=Arial 
size=2> 
  It performs as you wanted it to perfom and takes 
  2 lines instead of 5.
  It is all actually simpler than you think. 
  
  Best regards,Tomasz 
  Janeczkoamibroker.com
  <BLOCKQUOTE 
  >
    ----- Original Message ----- 
    <DIV 
    >From: 
    Herman van den 
    Bergen 
    To: <A title=amibroker@xxxxxxxxxxxxxxx 
    href="">amibroker@xxxxxxxxxxxxxxx 
    Sent: Friday, July 23, 2004 12:45 
    AM
    Subject: RE: [amibroker] Need help with 
    SetBarsRequired...
    
    <FONT face=Arial color=#0000ff 
    size=2>The number in the title, did it stay or was it 'replaced' by a 
    permanent error msg? 
    <FONT face=Arial color=#0000ff 
    size=2> 
    <FONT face=Arial color=#0000ff 
    size=2>The subscript should not be out of range...any idea what is wrong 
    with my code? 
    <FONT face=Arial color=#0000ff 
    size=2> 
    I 
    think the error occurs in the first two passes but not in the last. If 
    nobody can correct me I'll send it to support. I think this problem was 
    reported on the list more than a year ago but i can't remember/find whether 
    there was a solution.
    <FONT face=Arial color=#0000ff 
    size=2> 
    <FONT face=Arial color=#0000ff 
    size=2>thanks!
    <FONT face=Arial color=#0000ff 
    size=2>herman
    
      <FONT face=Tahoma 
      size=2>-----Original Message-----From: Ara Kaloustian 
      [mailto:ara1@xxxxxxxxxx]Sent: Thursday, July 22, 2004 5:48 
      PMTo: amibroker@xxxxxxxxxxxxxxxSubject: Re: 
      [amibroker] Need help with SetBarsRequired...Importance: 
      High
      Herman,
       
      I got an answer (in title line) of 19.19 and 
      then an error message saying subscript out of range
      <BLOCKQUOTE 
      >
        ----- Original Message ----- 
        <DIV 
        >From: 
        Herman van den 
        Bergen 
        To: <A 
        title=amibroker@xxxxxxxxxxxxxxx 
        href="">AmiBroker YahooGroups 
        Sent: Thursday, July 22, 2004 12:23 
        PM
        Subject: [amibroker] Need help with 
        SetBarsRequired...
        
        Sorry to 
        raise this topic once more...but could some kind soul please turn ON 
        QuickAFL and run the example code below in an Indicator by 
        pressing APPLY? <SPAN 
        class=500051718-22072004>In the AB Status bar it says it retrieved 89815 
        bars (RT data), <SPAN 
        class=500051718-22072004>Using DebugView, 
        w<SPAN 
        class=500051718-22072004>ith QuickAFL 
        Enabled, pressing Apply gives me these 
        numbers:
        <SPAN 
        class=500051718-22072004> 
        <SPAN 
        class=500051718-22072004>[1704] # 
        BarNum=75,988  BarCount=75989[1704] # BarNum=75,918  
        BarCount=75989[1704] # BarNum=75,918  
        BarCount=483<SPAN 
        class=500051718-22072004>
        It appears that the BarCount 
        returned by <FONT face="Times New Roman" 
        size=3>SelectedValue(BarIndex()) during the first the two passes 
        defaults to normal count even though QuickAFL is enabled<SPAN 
        class=500051718-22072004>, this 
        triggers an error msg. Can 
        somebody please explain how i can run this code with QuickAFL() 
        On and SetBarsRequired()? I know 
        that i can program around the problem but that doesn't help me in 
        my real application. 
        <SPAN 
        class=500051718-22072004><FONT 
        size=2> 
        <FONT face=Arial 
        size=2>Your help will be much appreciated!
        <FONT face=Arial 
        size=2>herman.
        <SPAN 
        class=500051718-22072004> 
        
        
        
        SetBarsRequired( 
        100,10);
        MyCustomArray = 
        EMA(C,3); BarNum = SelectedValue(BarIndex()); // i want to read 
        the value at the cursorNumberFromMyCustomIndicator = MyCustomArray 
        [Barnum]; Title = "NumberFromMyCustomIndicator 
        ="+NumToStr(NumberFromMyCustomIndicator ,1.2);
        //_TRACE("# 
        BarNum="+NumToStr(BarNum,1.0)+"  
        BarCount="+NumToStr(BarCount,1.0,False));
        
        
        Check AmiBroker web page at:<A 
        href="">http://www.amibroker.com/Check 
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        href="">http://groups.yahoo.com/group/amibroker/files/groupfaq.html 
        Check AmiBroker web page at:<A 
        href="">http://www.amibroker.com/Check 
        group FAQ at: <A 
        href="">http://groups.yahoo.com/group/amibroker/files/groupfaq.html 
        Check AmiBroker web page 
    at:<A 
    href="">http://www.amibroker.com/Check 
    group FAQ at: <A 
    href="">http://groups.yahoo.com/group/amibroker/files/groupfaq.html 
    Check AmiBroker web page at:<A 
    href="">http://www.amibroker.com/Check 
    group FAQ at: <A 
    href="">http://groups.yahoo.com/group/amibroker/files/groupfaq.html 
    


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