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Tomasz,
Terry,
Thanks.
I think I've got it straight now.
Wayne
--- In amibroker@xxxxxxxxxxxxxxx, "Tomasz Janeczko" <groups@xxx>
wrote:
>
> Hello,
>
> > I was under the impression that QuickAFL loads bars depending
> > on what is needed to do the calculations in the code
>
> Your impression was and is correct. But "what is needed to
> do calcs" depends on zoom range, functions used, and other factors.
>
> I explained it in more details on amibroke-beta list 3 years ago:
> http://finance.groups.yahoo.com/group/amibroker-beta/message/1123
>
> At the same time code can be executed many times in many
> different contexts (for example tooltip, commentary,
interpretation) and you should make
> NO assumptions on how it is calculated.
>
> Simply always loop from bar ZERO to (BarCount -1 ) bar.
>
> Now BarIndex() is simply the original number of the bar in the
> full data set.
>
> Again look in the docs:
> http://www.amibroker.com/guide/afl/afl_view.php?barindex
>
> Best regards,
> Tomasz Janeczko
> amibroker.com
> ----- Original Message -----
> From: "wlandry01" <wlandry01@xxx>
> To: <amibroker@xxxxxxxxxxxxxxx>
> Sent: Wednesday, January 10, 2007 11:39 PM
> Subject: [amibroker] Re: loop counter
>
>
> > Terry,
> >
> > Your code example illustrates on something that I do not
> > understand about QuickAFL. It would seem to me that the line:
> >
> > x = BarIndex();
> >
> > would create an array containing a value for every bar in the
> > database and that QuickAFL would, therefore, load all
> > array values in order to perform the calculations. As you noted,
> > however, BarCount varies depending on the location in the
> > chart, so some subset of the entire array is loaded.
> >
> >, but
> > it appears, instead, that what QuickAFL loads depends on the
> > location of the selection in the current chart view.
> >
> > Is that correct? If so, are code statements re-evaluated based on
> > the selection location in the chart each time the selection is
> > reset?
> >
> > Thanks,
> >
> >
> > Wayne
> >
> >
> >
> > --- In amibroker@xxxxxxxxxxxxxxx, "Terry" <MagicTH@> wrote:
> >>
> >> BarCount does not necessarily == LastValue(BarIndex())
> >>
> >> This is because Amibroker uses "quickAFL" which means it only
uses
> > enough
> >> bars to "get the job done". This frequently is not all the bars.
> >>
> >> --
> >> Terry
> >>
> >> -----Original Message-----
> >> From: amibroker@xxxxxxxxxxxxxxx
[mailto:amibroker@xxxxxxxxxxxxxxx]
> > On Behalf
> >> Of klaus_korneker
> >> Sent: Wednesday, January 10, 2007 09:48
> >> To: amibroker@xxxxxxxxxxxxxxx
> >> Subject: [amibroker] Re: loop counter
> >>
> >> Hi Terry,
> >>
> >> thank you very much for your explanation !
> >> However it looks a little bit strange. It works still the same.
> >> When set the entire array to 0 with Cnt = 0; and click Apply, it
shows
> >> the same value as with the confirmation code in the graph.
However
> >> automatically after about 1 second it changes the value to 199
instead
> >> 4517
> >>
> >> BTW: i know that it displays the number in the title based on my
> > cursor.
> >>
> >> Regards
> >>
> >> Klaus
> >>
> >>
> >> --- In amibroker@xxxxxxxxxxxxxxx, "Terry" <MagicTH@> wrote:
> >> >
> >> > To initialize the loop you should do this:
> >> > Cnt = 0; //Initializes entire array, not just 1st element.
> >> >
> >> > When you click on the chart the number should change because
you are
> >> > selecting "that bar". Also see last paragraph about barcount.
> > Otherwise,
> >> > your loop is correct.
> >> >
> >> > Here's some code to verify with:
> >> >
> >> > x = BarIndex();
> >> > Plot(x,"x",1,styleStaircase);
> >> > NumToStr(BarCount,1.0);
> >> > NumToStr(LastValue(BarIndex()),1.0);
> >> >
> >> > Note the last two statements print in the interpretation
window and
> >> they are
> >> > different because of quickAFL. The first changes with your
selection
> >> and the
> >> > number of bars showing. The last does not change. It is the
absolute
> >> number
> >> > of bars in your data. This is probably the reason your results
are
> >> changing
> >> > in unexpected ways as you are using BarCount.
> >> > --
> >> > Terry
> >> >
> >> > -----Original Message-----
> >> > From: amibroker@xxxxxxxxxxxxxxx
[mailto:amibroker@xxxxxxxxxxxxxxx]
> >> On Behalf
> >> > Of klaus_korneker
> >> > Sent: Wednesday, January 10, 2007 07:43
> >> > To: amibroker@xxxxxxxxxxxxxxx
> >> > Subject: [amibroker] loop counter
> >> >
> >> > Hello,
> >> >
> >> > i am trying to build a counter with a loop. i have already
tried the
> >> > following, but it seems that anything is wrong. The chart
shows the
> >> > bar number, but when i click inside the chart, the number
changes.
> >> >
> >> > Cnt[0] = 0;
> >> > for( i = 0; i < BarCount; i++ )
> >> > {
> >> > Cnt[ i ] = i ;
> >> > }
> >> >
> >> > Graph0 = Cnt;
> >> >
> >> > Thanks i advance !
> >> >
> >> >
> >> >
> >> > 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 NEW RELEASE ANNOUNCEMENTS and other news always check
DEVLOG:
> >> > http://www.amibroker.com/devlog/
> >> >
> >> > 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 NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG:
> >> http://www.amibroker.com/devlog/
> >>
> >> 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 NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG:
> > http://www.amibroker.com/devlog/
> >
> > For other support material please check also:
> > http://www.amibroker.com/support.html
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
>
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