Fw: [amibroker] Strange AB formula

["Tomasz Janeczko" <amibroker@xxxxxx>]

Hello,

Advice: never use == operator with fractional numbers.

Your formula should be rewritten to avoid fractionals and corresponding
problems this way:

Buy = ( Year() % 10)==6 ;

% is MODULO operator (the reminder from division)
http://www.amibroker.com/guide/a_language.html


Best regards,
Tomasz Janeczko
amibroker.com
----- Original Message ----- 
From: "Tomasz Janeczko" <amibroker@xxxxxx>
To: <amibroker@xxxxxxxxxxxxxxx>
Sent: Saturday, January 22, 2005 4:09 PM
Subject: Re: [amibroker] Strange AB formula


> 
> Hello,
> 
> Short story:
> 0.6 has infinite representation on any binary computer (using binary arithmetic), 
> the same way as 1/3 has infinite representation in decimal system, while 0.5 has finite representation
> in binary arithmetic. That's why.
> 
> Long story:
> Mailing list archive:
> 
> http://groups.yahoo.com/group/amibroker/message/37782
> 
> 
> Best regards,
> Tomasz Janeczko
> amibroker.com
> ----- Original Message ----- 
> From: "dbirru" <dbjunk@xxxxxxxxxxxxx>
> To: <amibroker@xxxxxxxxxxxxxxx>
> Sent: Saturday, January 22, 2005 3:16 PM
> Subject: [amibroker] Strange AB formula
> 
> 
>> 
>> 
>> Can some one tell me why the following formula does not generate any
>> trade? It is supposed to generate a buy signal on all years that end
>> with the 6th. I have tried all other years. The only that works is
>> with 0.5.
>> 
>> Buy =   (frac(Year()/10)==0.6) ;
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> Check AmiBroker web page at:
>> http://www.amibroker.com/
>> 
>> Check group FAQ at: http://groups.yahoo.com/group/amibroker/files/groupfaq.html 
>> Yahoo! Groups Links
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>>
> 
> 
> 
> Check AmiBroker web page at:
> http://www.amibroker.com/
> 
> Check group FAQ at: http://groups.yahoo.com/group/amibroker/files/groupfaq.html 
> Yahoo! Groups Links
> 
> 
> 
> 
> 
> 
> 
>


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