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thanks Paul, must be because it is using QT plugin
no matter how long you use AB, or how much you know, there is always something else to learn.
On 4/8/06, Paul Ho <paultsho@xxxxxxxxxxxx> wrote:
I think if you set your data source to local database, then bars to load has no effect. But if you set your data source to other plugin even with local data storage enabled. It will have an impact. I have tried it on my daily data which has a local storage, it does not change the number of bars it loads.
Cheers
Paul
Now the following newsletter shows you how to add bars into a stock. the logic with removing bars is similar.
Sent: Saturday, 8 April 2006 8:27 AM
It was my understanding that if you set (for local database only) your
database settings - bars to load to 260, then AB woud only store 260
bars, or alternatively only load 260 bars into memory
I fell foul of this with my intraday database and lost a lot of data
because I had too few bars in the setting thinking it would store the
data and only load the set number of bars.
--
Cheers
Graham
AB-Write >< Professional AFL Writing Service
Yes, I write AFL code to your requirements
http://e-wire.net.au/~eb_kavan/ab_write.htm
On 4/7/06, mrdavis9 <
mrdavis9@xxxxxxxxxx> wrote:
>
> Graham>>I see absolutely no reason to only hold 260 bars in a database.
>
> Ron D.>>I will start running my actual Trading Explorations from this 6
> Month database
>
> Graham,or Paul,Please correct me if I interpreting thos incorrectly.
> =================================
> My TRADING EXPLORATION looks back only 20 days, and I got the impression
> from one of our Local Amibroker guru's that a shorter database will run
> faster, and that is why he runs his TRADING EXPLORATIONS from a shorter
> database than he uses for BACKTESTING.
>
> My US_Stocks folder is LOCAL, and Paul Ho has cited the user manual which
> indicates that NUMBER OF BARS TO LOAD will have no effect in my case, and
> that a PROGRAMMER would need to write a script or com object to accomplish
> what I want to do.
>
> Ideally, I would like to have something that automatically eliminates each
> day of data that becomes older than 6 months right after I finish a new
> daily YahooCurrent download from Yahoo.
>
> I am definately NOT A PROGRAMMER, so if such a script already exists, I
> would appreciate hearing where it is, and if it doesn't exist, maybe an
> Amibroker user would like to creat it. Thanks Paul and Graham for your help.
> Ron D.
>
> ----- Original Message -----
> From: Paul Ho
> To:
amibroker@xxxxxxxxxxxxxxx
> Sent: Thursday, April 06, 2006 10:26 PM
> Subject: RE: [amibroker] USstocks DATABASE
>
> From the user's guide
> Number of bars to load - defines how many bars should be loaded from
> external data source and kept in AmiBroker. Examples: 10-years EOD: 2600,
> 60-days intraday 1-minute: 30000 (approx). This setting has no effect if
> data source is set to (local).
>
> You if your database is local. then you need to write scripts or use com
> objects in your afl to delete data from the database, its possible though.
>
>
> ________________________________
> From:
amibroker@xxxxxxxxxxxxxxx [mailto:amibroker@xxxxxxxxxxxxxxx] On Behalf
> Of Graham
> Sent: Friday, 7 April 2006 8:23 AM
> To: amibroker@xxxxxxxxxxxxxxx
> Subject: Re: [amibroker] USstocks DATABASE
>
> I see absolutely no reason to only hold 260 bars in a database. In
> bcktesting you specify the period of the test so it makes no
> difference if you ahve 1 year or 100 years, you only test over what
> you want. There could even be a problem only having a short database
> history as some methods are compiled over the histlry and a short one
> could provide very different results.
> Also if you use for example EMA(H,50) in your conditions then you have
> immediately lost 20% of your history as it requires 50 bars to start
> results
>
> --
> Cheers
> Graham
> AB-Write >< Professional AFL Writing Service
> Yes, I write AFL code to your requirements
>
http://e-wire.net.au/~eb_kavan/ab_write.htm
>
>
> On 4/7/06, mrdavis9 <mrdavis9@xxxxxxxxxx
> wrote:
> > Thanks Graham. I set the bars to 260 which Amibroker says is about a
> > year's worth of data.
> >
> > If this really does make Amibroker totally ignore all the rest of the
> data,
> > then why does one of our local computer guru Amibroker users keep a
> separate
> > short database for trading purposes, and he uses a longer database for
> > backtesting.
> >
> > Is it possibly because he finds it easier to not have to keep changing
> the
> > BARS TO LOAD setting. Ron D
> >
> > ===================================================
> > ----- Original Message -----
> > From: "Graham" <kavemanperth@xxxxxxxxx
>
> > To: <amibroker@xxxxxxxxxxxxxxx>
> > Sent: Thursday, April 06, 2006 12:52 AM
> > Subject: Re: [amibroker] USstocks DATABASE
> >
> >
> > > You could just make the Database settings, Bars to load to be 126 or
> > > similar for 6 months of data.
> > >
> > > --
> > > Cheers
> > > Graham
> > > AB-Write >< Professional AFL Writing Service
> > > Yes, I write AFL code to your requirements
> > >
http://e-wire.net.au/~eb_kavan/ab_write.htm
> > >
> > >
> > >
> > > On 4/6/06, mrdavis9 <mrdavis9@xxxxxxxxxx> wrote:
> > >>
> > >> I am using the FREE EOD data from Yahoo.
> > >> My Yahoo US_stocks database goes all the way back to 10/01/1928.
> > >>
> > >> I copied all of this US_stocks database into a new folder which I
> > >> have
> > >> named US_stocks_6Months.
> > >>
> > >> I will start running my actual Trading Explorations from this 6Month
> > >> database as soon as I can learn how to eliminate all of the DATA that
> is
> > >> older than 6 months. Right now, it still has all of the data back to
> > >> 1928.
> > >>
> > >> Ideally, I would like to have something that automatically eliminates
> the
> > >> one day of data that becomes older than 6 months right after I finish a
> > >> new
> > >> daily YahooCurrent download from Yahoo.
> > >>
> > >> Hopefully, someone will be able to show me how I can accomplish this.
> > >> Ron D
> > >>
> > >> 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
> > >>
> > >>
> > >>
> > >>
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> >
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> >
> >
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> >
> >
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> >
> >
> >
> >
> >
>
>
> Please note that this group is for discussion between users only.
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> To get support from AmiBroker please send an e-mail directly to
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>
> For other support material please check also:
>
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>
>
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