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Hello,
You can use SetBarsRequired to override any internal estimate as described in the KB:
http://www.amibroker.com/kb/2008/07/03/quickafl/
Note however that QuickAFL is only enabled in Automatic Analysis
starting from version 5.14. Any versions prior to that only use QuickAFL for indicators.
Best regards,
Tomasz Janeczko
amibroker.com
----- Original Message -----
From: "Ronald Davis" <xokie7@xxxxxxxxx>
To: <amibroker@xxxxxxxxxxxxxxx>
Sent: Friday, August 22, 2008 12:13 AM
Subject: Re: [amibroker] Re: Size of Database...
> Thanks for the Info Steve.
>
> Is the below example how I would like to be able to use SETBARSREQUIRED.
> Also, will it work in my version
>
> 5.00, which is the last upgrade that I am entitled to.
>
> I will eagerly pay TJ more money to upgrade if I will REALLY be able to use
> SETBARSREQUIRED in a simple
>
> way to limit the LOOKBACK period to 101 days. Thanks Ron D.
> -------------------------------------------------------------------------------------------------
> pk IS THE>pink line, AND yl IS THE>>yellow line , AND mn
> IS>>MIN(bk,MIN(yl,gn));
> -------------------------------------------------------------------------------------------------
> sq1=pk==mx AND yl >bk AND bk>mn AND wh==mn;
>
> rq1=Sum(bkxmn,3) AND Sum(ylxmn,3) AND
> ValueWhen(rddip,Sum(rd<35,2),1);
>
> Buy1=sq1 and rq1 and SetBarsRequired(101);
> ----------------------------------------------------------------------
> ----- Original Message -----
> From: "Steve Dugas" <sjdugas@xxxxxxxxxxx>
> To: <amibroker@xxxxxxxxxxxxxxx>
> Sent: Thursday, August 21, 2008 4:14 PM
> Subject: Re: [amibroker] Re: Size of Database...
>
>
>> Hi Ron - I believe the user does have final control over how far AB looks
>> back. If you place SetBarsRequired at the *end* of your code I think it
>> will
>> override what AB has previously calculated. It is discussed in the recent
>> ReadMe file.
>>
>> Steve
>>
>> ----- Original Message -----
>> From: "Ronald Davis" <xokie7@xxxxxxxxx>
>> To: <amibroker@xxxxxxxxxxxxxxx>
>> Sent: Thursday, August 21, 2008 4:24 PM
>> Subject: Re: [amibroker] Re: Size of Database...
>>
>>
>>> sidhartha70>>>So as a DB management strategy, it's best to perhaps have a
>>> large DB
>>> for backtesting purposes only... and a much smaller DB for live
>>> trading, charting, symbol swithcing etc..etc...??
>>> ------------------------------------------------------------------------------------------
>>> I think I remember that SET BARS REQUIRED will "NOT" stop Amibroker from
>>> looking back through the last 30 years even though I am looking at only
>>> the
>>> last day.
>>>
>>> I would sure like a feature in Amibroker that would make SET BARS
>>> REQUIRED
>>> lookback only 101 days when the indicator looks back only 100 days.
>>>
>>> My backtesting days officially ended a few days ago.
>>>
>>> My backtesting consisted of viewing my indicator buy signals against 30
>>> years of historical data.
>>>
>>> Even though I no longer backtest, I would still like to have a 30 year
>>> database, and here is why.
>>>
>>> Those symbols that are less volatile tend to have a decent amount of
>>> pattern
>>> similarity in my indicators as they enter into a NEW uptrend, after
>>> having
>>> been on a long term DOWNTREND.
>>>
>>> If I keep my 30 year database, then when I get a BUY signal, I can look
>>> back
>>> at the beginning of the previous new uptrends that occurred over the last
>>> 30
>>> years. This lookback helps me decide how good the signal is. Ron D
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> ----- Original Message -----
>>> From: "sidhartha70" <sidhartha70@xxxxxxxxx>
>>> To: <amibroker@xxxxxxxxxxxxxxx>
>>> Sent: Thursday, August 21, 2008 8:59 AM
>>> Subject: [amibroker] Re: Size of Database...
>>>
>>>
>>>> Thanks TJ.
>>>>
>>>> So as a DB management strategy, it's best to perhaps have a large DB
>>>> for backtesting purposes only... and a much smaller DB for live
>>>> trading, charting, symbol swithcing etc..etc...??
>>>>
>>>> Thanks
>>>>
>>>> --- In amibroker@xxxxxxxxxxxxxxx, "Tomasz Janeczko" <groups@xxx> wrote:
>>>>>
>>>>> Using 10x more data per symbol will give you slow down in all areas.
>>>>> 2 million bars is 64 MB per symbol of quote data and 8 MB per single
>>>> AFL array
>>>>> (if quickafl is not used). As formulas depending on complexity can
>>>> use hundreds of arrays
>>>>> this means approaching gigabytes of RAM.
>>>>> Handling that much of data is not "easy". Remember than RAM bandwidth
>>>>> is limited to few GB per second. Therefore just accessing that amount
>>>>> of data is question of seconds, not counting the calculations.
>>>>>
>>>>> Best regards,
>>>>> Tomasz Janeczko
>>>>> amibroker.com
>>>>> ----- Original Message -----
>>>>> From: "sidhartha70" <sidhartha70@xxx>
>>>>> To: <amibroker@xxxxxxxxxxxxxxx>
>>>>> Sent: Thursday, August 21, 2008 2:48 PM
>>>>> Subject: [amibroker] Re: Size of Database...
>>>>>
>>>>>
>>>>> > Anyone...?
>>>>> >
>>>>> > Many Thanks
>>>>> >
>>>>> > --- In amibroker@xxxxxxxxxxxxxxx, "sidhartha70" <sidhartha70@> wrote:
>>>>> >>
>>>>> >> This may have been answered before, but...
>>>>> >>
>>>>> >> I set up two DB's in AB... both IQ Feed tick DB's.
>>>>> >>
>>>>> >> 1. Is 200,000 bars per symbol.
>>>>> >> 2. The second is 2,000,000 per symbol.
>>>>> >>
>>>>> >> Practially, operationally, where will AB be slower in the use of the
>>>>> >> second DB...?? In charting? Backtesting (obviosuly)? In symbol
>>>>> >> switching etc...?
>>>>> >>
>>>>> >> I'm just trying to work out how motivated I should be to have small
>>>>> >> DB's...
>>>>> >>
>>>>> >> Thanks
>>>>> >>
>>>>> >
>>>>> >
>>>>> >
>>>>> > ------------------------------------
>>>>> >
>>>>> > 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
>>>
>>>
>>>
>>>
>>
>>
>>
>> ------------------------------------
>>
>> 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
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