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Hello,
It is fundamentally flawed idea to have fundamentals along with quote arrays,
simply because it would be tremendous waste of space, since funamental
data change only once a month (most frequently) and not every tick or every
second as prices are.
So historical fundamentals need *separate* database to make storage efficient.
You can have historical fundamental fields all the way by means of ODBC plugin.
http://www.amibroker.com/odbc.html
Best regards,
Tomasz Janeczko
amibroker.com
----- Original Message -----
From: "tipequity" <l3456@xxxxxxxxxx>
To: <amibroker@xxxxxxxxxxxxxxx>
Sent: Friday, August 07, 2009 7:57 PM
Subject: [amibroker] Re: Aux data fields
> Thx for your reply. Would please explain the difference between fundamental data fields and price arrays? Is it because price
> fields are arrays and fundamental data fields are scalar? If so, does it mean that we would never have historical fundamental
> fields in AB. TIA
>
>
> --- In amibroker@xxxxxxxxxxxxxxx, "Tomasz Janeczko" <groups@xxx> wrote:
>>
>> Hello,
>>
>> 1. You need to conserve memory. That is paramount importance. Not because of RAM, but because of CPU CACHE.
>> Anything that exceeds CPU on-chip cache size runs 10 times slower.
>> 2. On 64 bit systems there are strict guidelines for alignment for best performance - the structure needs to be 8 byte aligned,
>> so
>> you can not have odd number
>> of floats in the structure.
>> 3. It would make it very difficult to write 3rd party plugins if quotation structure size was not known in advance
>> 4. If you really want more fields - use different ticker (artificial ticker) and AddToComposite or use static arrays.
>>
>> All in all, for all practical reasons it makes no sense.
>>
>> Best regards,
>> Tomasz Janeczko
>> amibroker.com
>> ----- Original Message -----
>> From: "tipequity" <l3456@xxx>
>> To: <amibroker@xxxxxxxxxxxxxxx>
>> Sent: Thursday, August 06, 2009 11:06 PM
>> Subject: [amibroker] Aux data fields
>>
>>
>> > Tomasz
>> >
>> > What is the resean for limiting the number of aux data fields to two? Wouldn't it give more flexibility if it could have been
>> > user
>> > defined? TIA
>> >
>> >
>> >
>> > ------------------------------------
>> >
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>>
>
>
>
>
> ------------------------------------
>
> **** 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
>
>
>
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