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Thank you again Tomasz,
you wrote: 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).
Am i correct that the range is from 0..Barcount, not 0..Barcount-1;
Would the code below be the most efficient loop template that would work
under ALL Amibroker conditions and elliminate all out-of-range-errors? If
so, perhaps we should add it to the help file?
Test = Null;
NumberOfBlankBars = 3;
NumBarsRequired = 100;
SetBarsRequired( NumBarsRequired );
FirstVisibleBar = Max( Status( "FirstVisibleBar" ) - NumBarsRequired, 0 );
Lastvisiblebar = Status("LastVisibleBar") - NumberOfBlankBars;
for( n = Firstvisiblebar; n < Lastvisiblebar; n++)
{
Test[ n ] = n;
}
Plot(Test,"Test",6,styleArea);
Many thanks,
Herman
-----Original Message-----
From: Tomasz Janeczko [mailto:amibroker@xxxxxx]
Sent: Saturday, September 04, 2004 3:41 AM
To: amibroker@xxxxxxxxxxxxxxx
Subject: Re: [amibroker] Status("firstvisiblebarindex") vs
Status("firstvisiblebar")
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: "Herman van den Bergen" <psytek@xxxxxxxx>
To: <amibroker@xxxxxxxxxxxxxxx>
Sent: Saturday, September 04, 2004 1:16 AM
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
-----Original Message-----
From: s.carrasset [mailto:s.carrasset@xxxxxxxxxxx]
Sent: Friday, September 03, 2004 6:17 PM
To: amibroker@xxxxxxxxxxxxxxx
Subject: Re: [amibroker] Status("firstvisiblebarindex") vs
Status("firstvisiblebar")
Herman,
click on the chart and the results will be diferent...
stephane
Herman van den Bergen a écrit :
> Can some body explain the difference between
> Status("firstvisiblebarindex")
> and Status("firstvisiblebar"), and Status("Lastvisiblebarindex")
and
> Status("Lastvisiblebar") ? They seem to return the same
> values...Please try:
> 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);
>
> Tia,
>
> herman
>
>
>
> [Non-text portions of this message have been removed]
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