Graham, According to the AFL Reference, "FirstVisibleBar" returns the bar number while "FirstVisibleBarIndex" returns the bar index.
With respect to Fred's comments, the AFL Reference indicates that both are available in Indicator mode only, so checking them in Exploration mode is not an option. That's consistent with my experience. I copied Fred's code and displayed it on a chart and I find that the "FirstVisibleBar" and "LastVisibleBar" indicators give me non-zero values that do not change as I change the chart time frame. The numbers don't appear to correspond to anything on the chart. That part I don't understand. The "FirstVisibleBarIndex" and "LastVisibleBarIndex" give the index numbers and they do change with the chart. That part is consistent with the AFL Reference. I'm not familiar with the use of _Trace so I don't know how to use that to check on this question. If would be helpful if someone could advise as to what the "FirstVisibleBar" and "LastVisibleBar" indicators are showing in the code that Fred provided (see below). Thanks, Wayne Wayne --- In [email protected], Graham <[EMAIL PROTECTED]> wrote: > > 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 [email protected], "wlandry01" <wlandry01@> 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 [email protected], 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 [email protected], 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: > > > > > 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: > > http://www.amibroker.com/support.html > > > > > > Yahoo! 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