Bill, Thanks for the references on QuickAFL and "Display Chart Timing". I understand the situation better though I'm curious as to what QuickAFL is and why it is used. When I get some time I'll do some research in the archives. As you note, it's going to take some work to completely understand the nuances.
With respect to your last reply, I have never seen "firstvisiblebarcount". I've searched for it but can't find it anywhere. Is it the same as "firstvisiblebar"? Thanks, Wayne --- In [email protected], "wavemechanic" <[EMAIL PROTECTED]> wrote: > > They are both zero based but BarIndex() returns the array from 0 to "firstvisiblebarindex" (or "lastvisibilebarindex"). BarCount is the number of things in the array which is the same number for "firstvisiblebarindex" and "firstvisiblebarcount". Look up discussion of array vs. number. > > Bill > > ====================================== > There is a fundamental difference between BarCount and BarIndex(). BarCount is a numeric variable that holds just one number (the count of elements in array). On the other hand BarIndex() is a function that returns ARRAY representing consecutive index of each bar. > > ====================================== > > BarCount constant gives the number of bars in array (such as Close, High, Low, Open, Volume, etc). Array elements are numbered from 0 (zero) to BarCount-1. > > =================================== > > SYNTAX BarIndex() > RETURNS ARRAY > FUNCTION returns zero-based bar number - the same as Cum(1)-1 but it is much faster than Cum(1) when used in Indicators > > ======================== > > > > > ----- Original Message ----- > From: "wlandry01" <[EMAIL PROTECTED]> > To: <[email protected]> > Sent: Friday, September 01, 2006 3:18 PM > Subject: [amibroker] Re: Need Help With FirstVisibleBarIndex > > > > > > Bill, > > > > Sorry, but I meant to ask in my response to your note > > why "FirstVisibleBar" and "FirstVisibleBarIndex" would > > return the same values. According to the AFL Reference, > > one is the bar number and one is the bar index. I thought > > those differ by one. > > > > Thanks, > > > > > > Wayne > > > > > > > > --- In [email protected], "wavemechanic" <fimdot@> wrote: > >> > >> Put SetBarsRequired(10000,0) at the beginning of the code (overrides > > QuickAFL) and both sets will return the same values. Note, if blank > > right bars are visible they are counted. However, for your > > application of finding highest C, etc. look at the code and charts > > that I posted before and you will see that it is not needed in that > > case because the blank bars do not change the highest C, etc. Read > > about QuickAFL and turn on the chart timing display (Tools > > > Preferences > Display Timing). Play with this stuff and all will > > become crystal clear - sort of. > >> > >> Bill > >> > >> > >> ----- Original Message ----- > >> From: "wlandry01" <wlandry01@> > >> To: <[email protected]> > >> Sent: Friday, September 01, 2006 11:59 AM > >> Subject: [amibroker] Re: Need Help With FirstVisibleBarIndex > >> > >> > >> > > >> > 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 <kavemanperth@> 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 <ftonetti@> 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! 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