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Tomasz -
This triggered something I've been meaning to mention. QuickAFL in AA
was a great enhancement for optimization, and watchlist AA functions.
It freed me from having to generate date truncated clones of tickers for
fast optimization.
But it appears that there is a "chicken and egg" issue for single
tickers and AA functions. It first needs to execute once with all bars
for setup. That's OK for watchlist AA functions and all optimizations.
Where it can be problematic is for RT scans or explores running every N
seconds on a single ticker.
What would be ideal is it it was detected that the same AFL was running
over the same Range and it used the previous QuickAFL setup. This would
allow quick repeated scans of RT data while maintaining long history.
I'm making a wild guess that this is complicated by needing to detect
that the time period OR certain things in Settings haven't changed also.
But, if the changes aren't too bad, it might make a useful enhancement.
-- Bruce
P.S. Yes - I'll enter in the Feedback center unless you point out a bad
assumption.
--- In amibroker@xxxxxxxxxxxxxxx, "Tomasz Janeczko" <groups@xxx> wrote:
>
> Hello,
>
> This article
>
> http://www.amibroker.com/kb/2008/07/03/quickafl/
>
> explains:
>
> "In a similar manner, automatic analysis window can use subset of
available quotations to calculate AFL, if selected "range" parameter is
less than "All quotations".
>
> So, in short QuickAFL works so it calculates only part of the array
that is currently visible (indicator) or within selected range
(Automatic Analysis)."
>
> Best regards,
> Tomasz Janeczko
> amibroker.com
> ----- Original Message -----
> From: "sidhartha70" sidhartha70@xxx
> To: amibroker@xxxxxxxxxxxxxxx
> Sent: Saturday, July 18, 2009 12:55 PM
> Subject: [amibroker] Quick AFL in scans
>
>
> > Something's that confusing me slightly about Quick AFL...
> >
> > When charting, I understand that SetBarsRequired(500,0) sets the
number of bars per array to the number of visible bars + 500...
> >
> > However, when using Quick AFL in a scan, where the symbol being
scanned may not even be visible on a chart, therefore there is no
concept of 'bars visible', how does SetBarsRequired(500,0) work...?
> >
> > Does it simply set the array sizes to 500 bars back...?
> >
> > TIA
> >
> >
> >
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