Re: [amibroker] Status("firstvisiblebarindex") vs Status("firstvisiblebar")

["Tomasz Janeczko" <amibroker@xxxxxx>]

Hello,

FIRST category
firstvisiblebar / lastvisiblebar give you bar item number that can be used
to iterate arrays. It is in the range of 0..BarCount-1 (if you do not have blank bars in the right)
or 0..BarCount -1 + NumberOfBlankBars (if you have them).

SECOND category
firstvisiblebarindex / lastvisiblebar index give you bar index which is ABSOLUTE
position in the quotation database (like BarIndex()).

FIRST should be used if you want to reference array elements for example:
CloseAtFirstVisibleBar = Close[ Status("firstvisiblebar" ) ];

SECOND should be used if you want to compare to numbers returned by BarIndex(), for example:
CloseAtFirstVisibleBar = LastValue( ValueWhen( BarIndex() == Status("firstvisiblebarindex"), Close ) );

Those two things may be different but may be the same depending on how your formula is written
and how many previous/future bars are referenced.

The difference between the two is bi[ 0 ] term, i.e.:

bi = BarIndex();

firstvisblebarindex == firstvisiblebar + bi[ 0 ];
lastvisblebarindex == lastvisiblebar + bi[ 0 ];


This is already explained in the User's Guide:
http://www.amibroker.com/f?barindex


Best regards,
Tomasz Janeczko
amibroker.com
----- Original Message ----- 
From: "Corey Saxe" <res1wgwl@xxxxxxxxxxx>
To: <amibroker@xxxxxxxxxxxxxxx>
Sent: Saturday, September 04, 2004 2:28 AM
Subject: Re: [amibroker] Status("firstvisiblebarindex") vs Status("firstvisiblebar")


> Appears that QuickAFL rears its ugly head again.
> Put setbarsrequired at the top.
> 
> BTW, you don't need any numtostr.
> 
> Title ="\nfirstvisiblebarindex= "+firstvisiblebarindex+
> "\nfirstvisiblebar= "+firstvisiblebar+
> "\nLastvisiblebar= "+lastvisiblebar+
> "\nLastvisiblebarindex= "+Lastvisiblebarindex+
> "\nBarindex= "+BarIndex()+
> "\nBarcount= "+BarCount;
> 
> works fine.
> 
> -CS
>   ----- Original Message ----- 
>   From: Herman van den Bergen 
>   To: amibroker@xxxxxxxxxxxxxxx 
>   Sent: Friday, September 03, 2004 4:16 PM
>   Subject: RE: [amibroker] Status("firstvisiblebarindex") vs Status("firstvisiblebar")
> 
> 
>   [TJ] The difference is the same as between BarIndex() and BarCount.
>   Barindex() and barcount work as expected, but these new functions do not.
>   Please try the code below.
> 
>   [stepane] click on the chart and the results will be diferent...
>   That is what i expected, but nothing changes... did you try? PLEASE try the
>   code below, the barcount and BarIndex() work as expected but the others do
>   not. No matter what/where I click the first four numbers do not change, they
>   do change with chart scrolling.
> 
>   firstvisiblebar = Status("firstvisiblebar");
>   firstvisiblebarindex = Status("firstvisiblebarindex");
>   lastvisiblebar = Status("lastvisiblebar");
>   Lastvisiblebarindex = Status("Lastvisiblebarindex");
>   Title =
>   "\nfirstvisiblebarindex= "+NumToStr(firstvisiblebarindex,1.0,False)+
>   "\nfirstvisiblebar= "+NumToStr(firstvisiblebar,1.0,False)+
>   "\nLastvisiblebar= "+NumToStr(lastvisiblebar,1.0,False)+
>   "\nLastvisiblebarindex= "+NumToStr(Lastvisiblebarindex,1.0,False)+
>   "\nBarindex= "+NumToStr(BarIndex(),1.0,False)+
>   "\nBarcount= "+NumToStr(BarCount,1.0,False);
> 
>   What do i do wrong?
>   herman
> 
> 
> [Non-text portions of this message have been removed]
> 
> 
> 
> 
> Check AmiBroker web page at:
> http://www.amibroker.com/
> 
> Check group FAQ at: http://groups.yahoo.com/group/amibroker/files/groupfaq.html 
> Yahoo! Groups Links
> 
> 
> 
>  
> 
> 


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