Re: [amibroker] Looping within QuickAFL bounds

["Tomasz Janeczko" <amibroker@xxxxxx>]

Herman,
 
You do not do worry about it or handle it by 
yourself.
AmiBroker does it for you.
 
for(bar=0; bar<barcount; bar++) { .... 
}
 
does not waste any cycles,
 
Try it:

 
array = 0;
for(bar=0; bar<barcount; bar++) 
{ 
  array[ bar ] = bar; 
}
Plot( array, "bar", colorRed );
Plot( BarIndex(), "barindex", colorBlue 
);
 
This  because array item 0 already is the 
first bar used by quick AFL (not the first bar in your data set)
and (barcount-1) is a last array item of 
quickafl (not the last bar in your data set).
I have mentioned it that barcount is a number of 
bars (items) in the array which may be smaller.
 

<TABLE  cellSpacing=0 
cellPadding=0 width=529 border=0 x:str>
  
  
    <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 
    >
 
As you can see in the picture above when QuickAFL 
is on, BarCount variable will give you 6 in that case
(the number of items in the array). So if you will 
iterate from 0 to 5 you will access only visible
items automatically.
 <FONT face=Arial 
size=2>
So writing 
for(bar=0; bar<barcount; bar++)  you are already accessing only 
what is necessary, not more.
 
Please note that the very first exectution after 
clicking "APPLY" in Indicator Builder uses always *ALL* bars 
because
it needs to analyse your code and its requirements. 
Only subsequent executions use QuickAFL (less bars).

Best regards,Tomasz 
Janeczkoamibroker.com
<BLOCKQUOTE 
>
  ----- Original Message ----- 
  <DIV 
  >From: 
  Herman van den 
  Bergen 
  To: <A title=amibroker@xxxxxxxxxxxxxxx 
  href="">AmiBroker YahooGroups 
  Sent: Sunday, July 25, 2004 2:38 AM
  Subject: [amibroker] Looping within 
  QuickAFL bounds
  
  <SPAN 
  class=437013000-25072004>Hello,
  <SPAN 
  class=437013000-25072004> 
  would anybody have 
  figured out how to restrict a loop to the same range as QuickAFL. Normally is 
  use loops like:
  
    for(bar=0; 
    bar<barcount; bar++) { .... }
  <SPAN 
  class=437013000-25072004> 
  However this is 
  wasting a lot of cycles, especially when working with about 100,000 minute 
  bars of which only the displayed segment (about 1% of the data) is 
  important. <SPAN 
  class=437013000-25072004>For use with QuickAFL ON, can anybody provide 
  the code to define:
  
    <SPAN 
    class=437013000-25072004>FirstBarUsedByQuickAFL =  
?
    <SPAN 
    class=437013000-25072004>LastBarUsedByQuickAFL =  
  ?
  <SPAN 
  class=437013000-25072004>so that I can make the loop like 
  so:
  
    <SPAN 
    class=437013000-25072004>for( bar = FirstBarUsedByQuickAFL; bar <= 
    LastBarUsedByQuickAFL; Bar++ ) { .... 
  }
  Many 
  thanks,
  <SPAN 
  class=437013000-25072004>herman.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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