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Yes, i now understand.
Many thanks,
Sam
--- In amibroker@xxxxxxxxxxxxxxx, "Tomasz Janeczko" <amibroker@xxxx>
wrote:
> Hello,
>
> The second version simply makes no sense.
>
> The first is executed as follows (I added parentheses to show the
order):
> Sell= (SellPrice==bestlong) OR (TimeNum()==190000);
> Cover = (CoverPrice==bestshort) OR (TimeNum()==190000);
>
> and it makes sense.
>
> The second version executes like this:
>
> Sell = ( ( SellPrice == TimeNum() ) == 190000 ) OR bestlong ;
> Cover= ( ( CoverPrice == TimeNum() ) ==190000 ) OR bestshort;
>
> and it makes no sense because it attempts to match price to time,
> then boolean result of such comparison to a number 190000 and
> at the end it is all ORed.
>
> The precedence table is here:
> http://www.amibroker.com/guide/a_language.html
>
> As you can see "equal to" operator has higher precedence than OR
> and for that reason executed before OR-ing.
>
> Best regards,
> Tomasz Janeczko
> amibroker.com
> ----- Original Message -----
> From: "qweds_560" <qweds_560@xxxx>
> To: <amibroker@xxxxxxxxxxxxxxx>
> Sent: Sunday, January 23, 2005 4:12 PM
> Subject: [amibroker] OR operator
>
>
> >
> >
> > Hello,
> >
> > Can someone please tell me why I receive different results in
the
> > backtester when using:
> >
> > Sell=SellPrice==bestlong OR TimeNum()==190000;
> > Cover=CoverPrice==bestshort OR TimeNum()==190000;
> >
> > and using:
> >
> > Sell=SellPrice== TimeNum()==190000 OR bestlong ;
> > Cover=CoverPrice== TimeNum()==190000 OR bestshort;
> >
> > (all I have done is to swap the timenum part with the bestlong
> > variable).
> >
> > Thanks
> >
> > Sam
> >
> >
> >
> >
> >
> >
> > 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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