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Tomasz or anyone else,
Sorry but I am still clear how the proposed handling of Divide by Zero
errors is going to work.
What happens if for example we write some AFL custom indicator code like:-
x=(H-L)/(C-L);
When the Close is very near but not equal to the Low indicator plot value
will be big. But when the Close matches the Low exactly the indicator plot
value drops to Zero? I know this is the current AFL behaviour becuase I have
been caught out by it before ;-)
For the indicator to follow a logical progression IMO it should plot a
bigger value when C-L is zero. So how will this be handled? Obviously one
can write code to defend against anticipated zero divides (my Metastock
indicators are full of these <g>) but without some error message from the
AFL engine it seems to me un-anticipated zero divides will get by
un-noticed.
I am probably missing something here - it's late!
John
----- Original Message -----
From: "Tomasz Janeczko" <amibroker@xxxxxx>
To: <amibroker@xxxxxxxxxxxxxxx>
Sent: Monday, March 03, 2003 6:41 PM
Subject: Re: [amibroker] Re: [Tomasz] 1 / 0 = 0? : NaN or Infinity would be
good
> John,
>
> I don't think so.
>
> 1/0 will still be displayed as {NaN}
>
> But statement like this
>
> 100 / ( 1/ 0 )
>
> will give zero, which is correct considering the fact
> that it could be rewritten to:
>
> 0 * 100/1
>
> Best regards,
> Tomasz Janeczko
> amibroker.com
> ----- Original Message -----
> From: "John" <jr-sw@xxxxxxxxxxxxxxxxx>
> To: <amibroker@xxxxxxxxxxxxxxx>
> Sent: Monday, March 03, 2003 7:17 PM
> Subject: Re: [amibroker] Re: [Tomasz] 1 / 0 = 0? : NaN or Infinity would
be good
>
>
> > Tomasz,
> >
> > If you take an automatic approach in AFL engine to Divide by Zero errors
> > then won't any genuine user logic/coding errors get masked?
> >
> > John
> > ----- Original Message -----
> > From: "Tomasz Janeczko" <amibroker@xxxxxx>
> > To: <amibroker@xxxxxxxxxxxxxxx>
> > Sent: Monday, March 03, 2003 5:26 PM
> > Subject: Re: [amibroker] Re: [Tomasz] 1 / 0 = 0? : NaN or Infinity would
be
> > good
> >
> >
> > > Mike,
> > >
> > > A next beta (4.29.8) will give you 100.
> > >
> > > Best regards,
> > > Tomasz Janeczko
> > > amibroker.com
> > > ----- Original Message -----
> > > From: <mik-u@xxxxxxxxxxx>
> > > To: <amibroker@xxxxxxxxxxxxxxx>
> > > Sent: Monday, March 03, 2003 6:20 PM
> > > Subject: [amibroker] Re: [Tomasz] 1 / 0 = 0? : NaN or Infinity would
be
> > good
> > >
> > >
> > > > Hi Tomasz,
> > > >
> > > > NaN or Infinity would be good. I just need something to check an
> > > > exception and get correct value (100) when calculating formula like
> > > > this:
> > > >
> > > > 100 - 100 / (1 + 30 / 0)
> > > >
> > > > Regards,
> > > > Mike
> > > >
> > > > --- In amibroker@xxxxxxxxxxxxxxx, "Tomasz Janeczko" <amibroker@xxxx>
> > > > wrote:
> > > > > Hello,
> > > > >
> > > > > When I am thinking more on this... maybe it would be better
> > > > > to display a special string "NaN" in such case?
> > > > >
> > > > > I will modify the WriteVal and this division handling so
> > > > > it displays NaN string so it is more obvious what happens.
> > > > >
> > > > > Best regards,
> > > > > Tomasz Janeczko
> > > > > amibroker.com
> > > > > ----- Original Message -----
> > > > > From: "Tomasz Janeczko" <amibroker@xxxx>
> > > > > To: <amibroker@xxxxxxxxxxxxxxx>
> > > > > Sent: Monday, March 03, 2003 8:57 AM
> > > > > Subject: Re: [amibroker] [Tomasz] 1 / 0 = 0?
> > > > >
> > > > >
> > > > > > Hello,
> > > > > >
> > > > > > (30/0) is NaN - NOT a NUMBER
> > > > > >
> > > > > > Division by zero is illegal operation.
> > > > > >
> > > > > > If there was no protection against dividing by zero
> > > > > > the program would just bomb out (crash and say good bye).
> > > > > >
> > > > > > Therefore when dividing two numbers X / Y AB checks
> > > > > > if Y is equal to zero and always returns zero in that case.
> > > > > >
> > > > > >
> > > > > > Best regards,
> > > > > > Tomasz Janeczko
> > > > > > amibroker.com
> > > > > > ----- Original Message -----
> > > > > > From: <mik-u@xxxx>
> > > > > > To: <amibroker@xxxxxxxxxxxxxxx>
> > > > > > Sent: Monday, March 03, 2003 4:00 AM
> > > > > > Subject: [amibroker] [Tomasz] 1 / 0 = 0?
> > > > > >
> > > > > >
> > > > > > > Tomasz,
> > > > > > >
> > > > > > > AB returning 0 for an expression like 1 / 0. Is it correct?
> > > > > > >
> > > > > > > The following expression
> > > > > > >
> > > > > > > 100 - 100 / (1 + 30 / 0)
> > > > > > >
> > > > > > > is equal 0 in AB, but I think it should be equal 100.
> > > > > > >
> > > > > > > Thanks,
> > > > > > > Mike
> > > > > > >
> > > > > > >
> > > > > > >
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