Re: [amibroker] foreigh

["jonf" <jonf_ca@xxxx>]

Thank a lot for this Tomasz,
 
Using foreign only once helpa little 
but Is it possible to avoid calculation (not only for 
foreign, but for everything) each time we use the scroll bar !
 
Jon !
<BLOCKQUOTE 
>
----- Original Message ----- 
<DIV 
>From: 
Tomasz Janeczko 

To: <A title=amibroker@xxxxxxxxxx 
href="">amibroker@xxxxxxxxxxxxxxx 
Sent: Tuesday, September 11, 2001 5:04 
AM
Subject: Re: [amibroker] foreigh

Dear Jon,
 
Foreign() and RelStrength functions are indeed 
much slower than
the rest because these function must match the 
dates from one
stock to another to generate price arrays 
that are "compatible" with currently
selected stock.
 
For example currently selected stock mayhave 
2-year history only and
the index you are comparing to can 
have 20-year history.
Foreign() and RelStrength() functions during 
generation of price arrays 
must find bars in index arrays thatmatch 
the dates of the currently selected stock.
What  is even worse, selected stock, 
may be not traded everyday and these functions
must be aware of this fact. This makes them 
slow.
 
To  overcome 
this issue use Foreign() or Relstrength() call only ONCE in your
formula, assign it to the variable and then use 
the variable instead of calling Foreign multiple times,
as shown below:
 
fclose = Foreign("^DJI", "C" );
 
fchange = fclose - ref( fclose, -5 
);
 
Best regards,
Tomasz Janeczko
amibroker.com
 
----- Original Message ----- 
<BLOCKQUOTE 
>
<DIV 
>From: 
jonf 
To: <A title=amibroker@xxxxxxxxxxxx 
href="">amibroker@xxxxxxxxxxxxxxx
Sent: 11 September, 2001 00:43
Subject: [amibroker] foreigh

Tomatz, 
 
Is it normal that the speed is decreasing dramatically 
when we use the foreign() and/or RelStrength() 
AFL function !
 
The speed is decreasing even more than if we write 
Jscript/VBscript inside AFL !
 
Also, are you recalculate the AFL of an 
indicator each time we use the scroll bar ? is it possible to 
calculate everything when we change the current symbol and do only a redraw 
when we scroll ?
 
Thanks for you reply !
 
Jon.
 Your use of Yahoo! Groups 
is subject to the Yahoo! Terms 
of Service. Your 
use of Yahoo! Groups is subject to the <A 
href="">Yahoo! Terms of Service.