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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:
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For other support material please check also:
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