|
PureBytes Links
Trading Reference Links
|
John,
As Tomasz wrote:
>> 1/0 will still be displayed as {NaN}
I think it means that x=(H-L)/(C-L) will also be NaN when C = L.
Hope it helps,
Mike
--- In amibroker@xxxxxxxxxxxxxxx, "John" <jr-sw@xxxx> wrote:
> 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@xxxx>
> 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@xxxx>
> > 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@xxxx>
> > > 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@xxxx>
> > > > 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
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > > Send BUG REPORTS to bugs@xxxx
> > > > > > > > Send SUGGESTIONS to suggest@xxxx
> > > > > > > > -----------------------------------------
> > > > > > > > Post AmiQuote-related messages ONLY to:
> > > > > amiquote@xxxxxxxxxxxxxxx
> > > > > > > > (Web page:
http://groups.yahoo.com/group/amiquote/messages/)
> > > > > > > > --------------------------------------------
> > > > > > > > Check group FAQ at:
> > > > > http://groups.yahoo.com/group/amibroker/files/groupfaq.html
> > > > > > > >
> > > > > > > > Your use of Yahoo! Groups is subject to
> > > > > http://docs.yahoo.com/info/terms/
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > >
> > > > > > > Send BUG REPORTS to bugs@xxxx
> > > > > > > Send SUGGESTIONS to suggest@xxxx
> > > > > > > -----------------------------------------
> > > > > > > Post AmiQuote-related messages ONLY to:
amiquote@xxxxxxxxxxxxxxx
> > > > > > > (Web page:
http://groups.yahoo.com/group/amiquote/messages/)
> > > > > > > --------------------------------------------
> > > > > > > Check group FAQ at:
> > > > > http://groups.yahoo.com/group/amibroker/files/groupfaq.html
> > > > > > >
> > > > > > > Your use of Yahoo! Groups is subject to
> > > > > http://docs.yahoo.com/info/terms/
> > > > > > >
> > > > > > >
> > > > > > >
> > > > >
> > > > >
> > > > > Send BUG REPORTS to bugs@xxxx
> > > > > Send SUGGESTIONS to suggest@xxxx
> > > > > -----------------------------------------
> > > > > Post AmiQuote-related messages ONLY to:
amiquote@xxxxxxxxxxxxxxx
> > > > > (Web page: http://groups.yahoo.com/group/amiquote/messages/)
> > > > > --------------------------------------------
> > > > > Check group FAQ at:
> > > http://groups.yahoo.com/group/amibroker/files/groupfaq.html
> > > > >
> > > > > Your use of Yahoo! Groups is subject to
> > > http://docs.yahoo.com/info/terms/
> > > > >
> > > > >
> > > > >
> > > >
> > > > Send BUG REPORTS to bugs@xxxx
> > > > Send SUGGESTIONS to suggest@xxxx
> > > > -----------------------------------------
> > > > Post AmiQuote-related messages ONLY to:
amiquote@xxxxxxxxxxxxxxx
> > > > (Web page: http://groups.yahoo.com/group/amiquote/messages/)
> > > > --------------------------------------------
> > > > Check group FAQ at:
> > > http://groups.yahoo.com/group/amibroker/files/groupfaq.html
> > > >
> > > > Your use of Yahoo! Groups is subject to
> http://docs.yahoo.com/info/terms/
> > > >
> > > >
> > > >
> > >
> > >
> > > Send BUG REPORTS to bugs@xxxx
> > > Send SUGGESTIONS to suggest@xxxx
> > > -----------------------------------------
> > > Post AmiQuote-related messages ONLY to: amiquote@xxxxxxxxxxxxxxx
> > > (Web page: http://groups.yahoo.com/group/amiquote/messages/)
> > > --------------------------------------------
> > > Check group FAQ at:
> http://groups.yahoo.com/group/amibroker/files/groupfaq.html
> > >
> > > Your use of Yahoo! Groups is subject to
> http://docs.yahoo.com/info/terms/
> > >
> > >
> > >
> >
> > Send BUG REPORTS to bugs@xxxx
> > Send SUGGESTIONS to suggest@xxxx
> > -----------------------------------------
> > Post AmiQuote-related messages ONLY to: amiquote@xxxxxxxxxxxxxxx
> > (Web page: http://groups.yahoo.com/group/amiquote/messages/)
> > --------------------------------------------
> > Check group FAQ at:
> http://groups.yahoo.com/group/amibroker/files/groupfaq.html
> >
> > Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/
> >
> >
> >
Send BUG REPORTS to bugs@xxxxxxxxxxxxx
Send SUGGESTIONS to suggest@xxxxxxxxxxxxx
-----------------------------------------
Post AmiQuote-related messages ONLY to: amiquote@xxxxxxxxxxxxxxx
(Web page: http://groups.yahoo.com/group/amiquote/messages/)
--------------------------------------------
Check group FAQ at: http://groups.yahoo.com/group/amibroker/files/groupfaq.html
Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
|