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John,
In the case you mentioned a very high value (+infinite) will be plotted.
I was thinking about adding function like
IsNan( array/number ) - detects NaN or
IsFinite( array/number ) - detects if the number is finite (not Nan nor infinite)
Best regards,
Tomasz Janeczko
amibroker.com
----- Original Message -----
From: "John" <jr-sw@xxxxxxxxxxxxxxxxx>
To: <amibroker@xxxxxxxxxxxxxxx>
Sent: Tuesday, March 04, 2003 1:27 AM
Subject: Re: [amibroker] Re: [Tomasz] 1 / 0 = 0? : NaN or Infinity would be good
> 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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