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Tomasz,
But... (yet another but!) relying on seeing spikes means you must to plot
the code and then scroll sideways to locate. What about all the code buried
deep in system tests which is never plotted?
John
----- Original Message -----
From: "Tomasz Janeczko" <amibroker@xxxxxx>
To: <amibroker@xxxxxxxxxxxxxxx>
Sent: Tuesday, March 04, 2003 11:15 AM
Subject: Re: [amibroker] Re: [Tomasz] 1 / 0 = 0? : NaN or Infinity would be
good
> John,
>
> It won't get unnoticed simply because plotting 1/0 will give you huge
> spikes.
>
> Best regards,
> Tomasz Janeczko
> amibroker.com
> ----- Original Message -----
> From: "John" <jr-sw@xxxxxxxxxxxxxxxxx>
> To: <amibroker@xxxxxxxxxxxxxxx>
> Sent: Tuesday, March 04, 2003 10:37 AM
> Subject: Re: [amibroker] Re: [Tomasz] 1 / 0 = 0? : NaN or Infinity would
be good
>
>
> > Tomasz,
> >
> > The proposed functions sound good and would be far more convenient than
> > IIFs.
> >
> > But....(why is there always a but?).. if I forget to use the appropriate
> > function in my code (i.e. I do not *anticipate* the condition) then will
the
> > AFL engine display a Divide by Zero error message when I attempt to plot
or
> > use the code? If it does not then my concern is the condition will go
> > undetected. IMO AFL engine should display message identifying the errror
and
> > bar - the user can then take appropriate action - either adding one of
the
> > proposed new functions to code or correcting the basic logic error in
code.
> >
> > Sorry to go on about this but I just don't like the idea of "errors"
going
> > unreported.
> >
> > John
> >
> > ----- Original Message -----
> > From: "Tomasz Janeczko" <amibroker@xxxxxx>
> > To: <amibroker@xxxxxxxxxxxxxxx>
> > Sent: Tuesday, March 04, 2003 8:42 AM
> > Subject: Re: [amibroker] Re: [Tomasz] 1 / 0 = 0? : NaN or Infinity would
be
> > good
> >
> >
> > > 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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