Re: [amibroker] Re: Need Help With FirstVisibleBarIndex

Thu, 31 Aug 2006 21:58:01 -0700

Thanks Steve, must have missed that in the beta updates, as it certainly does not appear in the help files for status, nor can I find it in the beta change files


--
Cheers
Graham
AB-Write >< Professional AFL Writing Service
Yes, I write AFL code to your requirements
http://e-wire.net.au/~eb_kavan/ab_write.htm


On 01/09/06, Steve Dugas <[EMAIL PROTECTED]> wrote:
Graham,
 
FVB / LVB return bar numbers based on QuickAFL arrays,  - i.e. visible bars plus preceding 30.
FVBI / LVBI return bar numbers based on full data arrays, even without SetBarsRequired.
 
Steve
----- Original Message -----
From: Graham
Sent: Thursday, August 31, 2006 11:39 PM
Subject: Re: [amibroker] Re: Need Help With FirstVisibleBarIndex

Thanks Fred. So FirstVisibleBar delivers the barindex() value as well FirstVisibleBarIndex. I would have thought that they would be different otherwise why have the both of them
That is gong to require reworking of all existing AFL that use FirstVisibleBar as a 0 or 1 value


--
Cheers
Graham
AB-Write >< Professional AFL Writing Service
Yes, I write AFL code to your requirements
http://e-wire.net.au/~eb_kavan/ab_write.htm

On 01/09/06, Fred <[EMAIL PROTECTED]> wrote:
Apparently ? Appears to ?

When in doubt use Explore or Plot or _Trace ...

Plot(Status("FirstVisibleBar"), "FVB", colorWhite);
Plot(Status("FirstVisibleBarIndex"), "FVBI", colorYellow);
Plot(Status("LastVisibleBar"), "FVB", colorGreen);
Plot(Status("LastVisibleBarIndex"), "FVBI", colorRed);

--- In amibroker@yahoogroups.com , "wlandry01" <[EMAIL PROTECTED]> wrote:
>
> Graham,
>
> I've seen conflicting comments on that point so I
> checked the AFL reference for "Status" online.  It shows the
> following;
>
> "firstvisiblebar", "lastvisiblebar", "firstvisiblebarindex",
> "lastvisiblebarindex" - return bar number or bar index of
> first/last visible bar. Available in indicator mode only.
>
> I used to think "firstvisiblebar" returned a "1", but it does,
> apparently, return the bar number, as the following code
> appears to work fine:
>
> HVC = Highest(ValueWhen(BarIndex() >= Status("FirstVisibleBar")
> AND BarIndex() <= Status("LastVisibleBar"), Check));
>
> If you have more recent information, of if I've misinterpreted
> something, please let me know as I've had some difficulty
> completely understanding the Status indicators.
>
> Thanks,
>
>
> Wayne
>
>
>
>
>
>
>
>
>
> --- In amibroker@yahoogroups.com, Graham <kavemanperth@> wrote:
> >
> > fistrvisiblebar returns a value of 1 on the first bar on screen.
So you
> > would need to use
> lastvalue(valuewhen(status("firstvisiblebar"),barindex()))
> >
> > however I believe there is now status("firstvisiblebarindex")
which will
> > give you the value of barindex
> >
> >
> >
> > --
> > Cheers
> > Graham
> > AB-Write >< Professional AFL Writing Service
> > Yes, I write AFL code to your requirements
> > http://e-wire.net.au/~eb_kavan/ab_write.htm
> >
> > On 01/09/06, wlandry01 <wlandry01@> wrote:
> > >
> > > Herman,
> > >
> > > Many thanks to you and all the others who provided input on
this.
> > > Sorry for the delay in responding but I decided to shut the
> > > computer down while waiting for Ernesto to work his way through
> > > South Florida.
> > >
> > > In any case, I now have my study working!  I do have a question,
> > > however, on the code that you listed:
> > >
> > > Plot(C,"",1,128);
> > > SetBarsRequired(1000000,1000000);
> > > BlankBarsInRightMargin = 4;
> > >
> > > Plot(BarIndex()==Status("FirstVisibleBar"),"",5,styleArea|
> > > styleOwnScale,-10,10);
> > >
> > > Plot(BarIndex()==Status("LastVisibleBar")-
BlankBarsInRightMargin,"",
> > > 4,styleArea|styleOwnScale,-10,10);
> > >
> > > When I chart this I get a light green line running from left to
> > > right on the chart.  At the far left there's a small, vertical
> > > green bar and on the far left there is a red bar.  On the far
> > > right of the chart "0.00000" is shown in both red and green.
> > > I've discovered that I can "separate" the red and green bars
> > > (and lines) by adjusting the minimum and maximum setpoints.
> > >
> > > I don't understand, however, what generates the green line
> > > between the two bars (or the red line, for that matter).
> > > The Plot statement seems to call for a plot when BarIndex()
> > > is equal to a specific value (the endpoints).  I reset the
> > > Plot statement to show BarIndex()>=Status("FirstVisibleBar")
> > > and the green bar expands to fill the entire screen, which makes
> > > sense to me, but I don't see what's generating the line in the
> > > original code.  Does the Plot statement assume a zero value if
> > > the statement returns false?
> > >
> > > Thanks,
> > >
> > >
> > > Wayne
> > >
> > >
> > > --- In amibroker@yahoogroups.com, Herman <psytek@> wrote:
> > > >
> > > > Fred, my post did not refer to your code; your code is fine
and does
> > > > what it is supposed to do. I just outlined some problems one
may
> > > > encounter when working with First/LastVisibleBar.
> > > >
> > > > The problems I eluded to have all happened to me at one time
or
> another
> > > > and resulted in a waste of my time. I use RT however I assume
the
> > > > problems can occur in EOD just the same. The problems can
easily be
> > > > confirmed by right-justifying your chart, running my code,
> > > > adding/removing the SetBarsRequired() and/or changing the
number of
> > > > Blank bars in Preferences. You will note that LastVisibleBar
marker
> > > > appears and disappears depending on what one might have
assumed
> to be
> > > > unrelated conditions.
> > > >
> > > > best regards,
> > > > herman
> > > >
> > > > Fred wrote:
> > > > > Herman,
> > > > >
> > > > > While I'd admit that the statement I posted really should
take the
> > > > > LastValue i.e.
> > > > >
> > > > > HVC = LastValue(Highest(ValueWhen(BarIndex() >= Status
> > > > > ("FirstVisibleBar") AND BarIndex() <=
> Status("LastVisibleBar"), C)));
> > > > >
> > > > > I don't follow the rest of your post ... With or without
bars
> in the
> > > > > right margin I seem to get the correct result when HVC is
> plotted ...
> > > > >
> > > > > Under what conditions do you not get the correct result ...
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > > Please note that this group is for discussion between users
only.
> > > > >
> > > > > To get support from AmiBroker please send an e-mail
directly to
> > > > > SUPPORT {at} amibroker.com
> > > > >
> > > > > For other support material please check also:
> > > > > http://www.amibroker.com/support.html
> > > > >
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> > > > > Yahoo! Groups Links
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> > >
> > >
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> > >
> > > Please note that this group is for discussion between users
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> > >
> > > To get support from AmiBroker please send an e-mail directly to
> > > SUPPORT {at} amibroker.com
> > >
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>






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