Re: [amibroker] Re: TC2005, AmiBroker Email List Archive

Tomasz, I can’t even begin to imagine the complexities involved nor do I want to try. My only question is – is this normal? If it is the way it is, so be it. I will live with it and if I can’t I will change data providers. Dave From: amibroker@xxxxxxxxxxxxxxx [mailto:amibroker@xxxxxxxxxxxxxxx] On Behalf Of Tomasz Janeczko Sent: Wednesday, April 05, 2006 9:52 AM To: amibroker@xxxxxxxxxxxxxxx Subject: Re: [amibroker] Re: TC2005 Hello, Things are A LOT more complicated that you think. There are zillions of mechanisms in AB to make data access as fast as possible and to workaround slowness of external data sources. Also various plugins do additional work to minimise accesses. AmiBroker uses data caching AND TC2k plugin uses "smart" retrieval so it requests entire history ONLY once and subsequent queries only check if there was update since last access so if you do measurements you will get VERY different results depending on various factors including the fact whenever given symbol quotes were accessed or not and other things. Best regards, Tomasz Janeczko amibroker.com ----- Original Message ----- From: Ara Kaloustian To: amibroker@xxxxxxxxxxxxxxx Sent: Wednesday, April 05, 2006 6:41 PM Subject: Re: [amibroker] Re: TC2005 I recall at the conference Fred saying that backtest and optimizations use the entire date range, ragardless of dates inputted in AA, the only thing that changes is the report. So it would be reasonable that Explorations work the same way Ara ----- Original Message ----- From: Joe Landry To: amibroker@xxxxxxxxxxxxxxx Sent: Wednesday, April 05, 2006 6:45 AM Subject: Re: [amibroker] Re: TC2005 Dave You're right, I stand corrected. It was a " harddrive" option that you could take at one time vs something else that was slower,...but that was a year or so before TC2005. Sorry couldn't help. I've got a friend with TC2005 that I could ask to run that screen for you? JOE ----- Original Message ----- From: MarketMonk777 To: amibroker@xxxxxxxxxxxxxxx Sent: Wednesday, April 05, 2006 8:12 AM Subject: RE: [amibroker] Re: TC2005 Hi Joe, The new TC2005 database is now completely on my hard drive. Not sure and doubt it if it gets loaded into RAM (if that is what you are asking). My TC2005 software is lightning fast. But that is it’s native DB and am sure it is optimized for displaying the pre-calculated results. I say that because when you update (retrieve prices) the database it runs through and performs all of the calculations for all of my PCFs etc. Dave From: amibroker@xxxxxxxxxxxxxxx [mailto:amibroker@xxxxxxxxxxxxxxx] On Behalf Of Joe Landry Sent: Wednesday, April 05, 2006 5:48 AM To: amibroker@xxxxxxxxxxxxxxx Subject: Re: [amibroker] Re: TC2005 Dave At one time when I subscribed to TC2000 a couple of years ago, there was an option in TC2000 to make the data, memory based. i.e. one could execute some process that moved the TC2000 data from disk to memory, so that at every TC2000 start up it made that move, and the TC2000 screens were much faster. I don't know if the recent versions still have that limitation, but I bet if your access every ticker array via the plug in from the disk you'll see slow access. Key question ... how does your TC2000 installation behave when you perform a TC2000 screen? You might check this out and ask TC help desk about this. Joe ----- Original Message ----- From: Duke Jones, CMT To: amibroker@xxxxxxxxxxxxxxx Sent: Tuesday, April 04, 2006 10:15 PM Subject: Re: [amibroker] Re: TC2005 Dave, That scan time does seems awfully long. I ran a simple scan of C>=(Ref(C,-1)*1.20) and it took only about 2 minutes on an older Dell Computer. I am not sure how to keep all the data from loading as I have the same issue with QP but there might be some other issues that are also affecting your scan times. You might check out Dan Clark's batch scripts or Fred's Batman to help automate the task as well which might also save you some run time. Regards, Duke Jones, CMT MarketMonk777 wrote: > Hi Bill, > > It is taking about 9 minutes to run my simple exploration. I have it > applied to the "Stocks" group and set for looking at the last 1 day(s). > > My goal is to run multiple explorations back to back, with each one saving > the results to a specific watchlist. > > If this is the way it is, so be it. This software is 1000x better than > TC2005 and all others out there. > > Dave > > -----Original Message----- > From: amibroker@xxxxxxxxxxxxxxx [mailto:amibroker@xxxxxxxxxxxxxxx] On Behalf > Of bvandyke > Sent: Tuesday, April 04, 2006 4:29 PM > To: amibroker@xxxxxxxxxxxxxxx > Subject: [amibroker] Re: TC2005 > > Dave, > I also use TC2005 and have noticed the same thing. No matter how many > days i set a backtest or exploration to....or what settings i use in > File--->database as described in the Help files, i still note Amibroker > apparently scans the #of bars in my TC2005 database. > > Maybe i'm missing something also. After using what you've tried months > ago and the File--> database settings , which take precedence over > Preferences (which i also varied), i just gave up. Maybe somebody > knows something we don't. > > Bill > > > --- In amibroker@xxxxxxxxxxxxxxx, "marketmonk777" <dlittner@xxx> wrote: > >> Hi folks, >> >> I am using TC2005 database as my source for EOD data. I was running a >> simple exploration to look for all stocks that are up 20% over >> yesterdays closing price. Simple enough and it works. >> >> But what I noticed is that while scanning through my database it seems >> to be loading all available bars. When I really only need 2 bars. Is >> there a way to specific this? It would speed up the exloration >> significantly. >> >> Dave >> >> > > > > > > > > > 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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