TJ, Is there any sort of overhead in running AFL in scans & explorations...? Because my own experience of running AFL over a watchlist in scan & exploration mode is that is runs considerably slower than equivalent code in an indicator using the same number of bars...
--- In [email protected], "Tomasz Janeczko" <gro...@...> wrote: > > Bruce, > > Something along these lines was planned already and will arrive at some point. > > Best regards, > Tomasz Janeczko > amibroker.com > ----- Original Message ----- > From: "bruce1r" <bru...@...> > To: <[email protected]> > Sent: Monday, July 20, 2009 4:29 PM > Subject: [amibroker] Re: Quick AFL in scans > > > > 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 [email protected], "Tomasz Janeczko" <groups@> 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@ > >> To: [email protected] > >> 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 > >> > > >> > > >> > > >> > ------------------------------------ > >> > > >> > **** IMPORTANT PLEASE READ **** > >> > This group is for the discussion between users only. > >> > This is *NOT* technical support channel. > >> > > >> > TO GET TECHNICAL SUPPORT send an e-mail directly to > >> > SUPPORT {at} amibroker.com > >> > > >> > TO SUBMIT SUGGESTIONS please use FEEDBACK CENTER at > >> > http://www.amibroker.com/feedback/ > >> > (submissions sent via other channels won't be considered) > >> > > >> > For NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG: > >> > http://www.amibroker.com/devlog/ > >> > > >> > Yahoo! Groups Links > >> > > >> > > >> > > >> > > > > > > > > > > ------------------------------------ > > > > **** IMPORTANT PLEASE READ **** > > This group is for the discussion between users only. > > This is *NOT* technical support channel. > > > > TO GET TECHNICAL SUPPORT send an e-mail directly to > > SUPPORT {at} amibroker.com > > > > TO SUBMIT SUGGESTIONS please use FEEDBACK CENTER at > > http://www.amibroker.com/feedback/ > > (submissions sent via other channels won't be considered) > > > > For NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG: > > http://www.amibroker.com/devlog/ > > > > Yahoo! Groups Links > > > > > > >
