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Both actually. It will load the most bars needed to do your requested
computations, which is NOT always ALL the bars. You can force loading of all
bars with SetBarsRequired(x,y);
--
Terry
-----Original Message-----
From: amibroker@xxxxxxxxxxxxxxx [mailto:amibroker@xxxxxxxxxxxxxxx] On Behalf
Of wlandry01
Sent: Wednesday, January 10, 2007 15:40
To: amibroker@xxxxxxxxxxxxxxx
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.
I was under the impression that QuickAFL loads bars depending
on what is needed to do the calculations in the code, 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@xxx> 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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