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 <[EMAIL PROTECTED]> 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 <[EMAIL PROTECTED]> 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
> > > >
> > > >
> > > > Yahoo! Groups Links
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > >
> >
> >
> >
> >
> >
> >
> >
> > 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:
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> >
> >
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> >
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> >
> >
> >
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> >
> >
>
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