arithmetic issues Aubrey Jaffer (21 Oct 2005 14:53 UTC)
Re: arithmetic issues John.Cowan (21 Oct 2005 15:59 UTC)
Re: arithmetic issues bear (21 Oct 2005 16:39 UTC)
Re: arithmetic issues Aubrey Jaffer (22 Oct 2005 01:17 UTC)
Re: arithmetic issues Thomas Bushnell BSG (22 Oct 2005 01:22 UTC)
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Re: arithmetic issues Bradley Lucier (23 Oct 2005 19:46 UTC)
Re: arithmetic issues Aubrey Jaffer (23 Oct 2005 20:10 UTC)
Re: arithmetic issues Aubrey Jaffer (23 Oct 2005 19:54 UTC)
Re: arithmetic issues Jens Axel Søgaard (23 Oct 2005 20:01 UTC)
Re: arithmetic issues Aubrey Jaffer (23 Oct 2005 20:50 UTC)
Re: arithmetic issues Thomas Bushnell BSG (23 Oct 2005 21:12 UTC)
Re: arithmetic issues Marcin 'Qrczak' Kowalczyk (23 Oct 2005 22:31 UTC)
Re: arithmetic issues Thomas Bushnell BSG (23 Oct 2005 22:33 UTC)
Re: arithmetic issues Marcin 'Qrczak' Kowalczyk (23 Oct 2005 22:50 UTC)
Re: arithmetic issues Thomas Bushnell BSG (23 Oct 2005 22:57 UTC)
Re: arithmetic issues Marcin 'Qrczak' Kowalczyk (24 Oct 2005 00:53 UTC)
Re: arithmetic issues Thomas Bushnell BSG (24 Oct 2005 01:05 UTC)
Re: arithmetic issues Marcin 'Qrczak' Kowalczyk (24 Oct 2005 01:45 UTC)
Re: arithmetic issues Taylor Campbell (24 Oct 2005 02:00 UTC)
Re: arithmetic issues Marcin 'Qrczak' Kowalczyk (24 Oct 2005 02:08 UTC)
Re: arithmetic issues Taylor Campbell (24 Oct 2005 02:14 UTC)
Re: arithmetic issues Marcin 'Qrczak' Kowalczyk (24 Oct 2005 02:27 UTC)
Re: arithmetic issues Taylor Campbell (24 Oct 2005 02:45 UTC)
Re: arithmetic issues Alan Watson (24 Oct 2005 02:13 UTC)
Re: arithmetic issues Taylor Campbell (24 Oct 2005 02:22 UTC)
Re: arithmetic issues Alan Watson (24 Oct 2005 03:19 UTC)
Re: arithmetic issues Thomas Bushnell BSG (24 Oct 2005 02:01 UTC)
Re: arithmetic issues Aubrey Jaffer (24 Oct 2005 02:27 UTC)
Re: arithmetic issues Alan Watson (24 Oct 2005 03:14 UTC)
Re: arithmetic issues John.Cowan (24 Oct 2005 05:37 UTC)
Re: arithmetic issues Per Bothner (24 Oct 2005 07:05 UTC)
Re: arithmetic issues Marcin 'Qrczak' Kowalczyk (24 Oct 2005 07:58 UTC)
Re: arithmetic issues Thomas Bushnell BSG (24 Oct 2005 08:05 UTC)
Re: arithmetic issues Alan Watson (24 Oct 2005 08:25 UTC)
reading NaNs Aubrey Jaffer (24 Oct 2005 15:35 UTC)
Re: reading NaNs Per Bothner (24 Oct 2005 17:35 UTC)
Re: reading NaNs bear (24 Oct 2005 19:23 UTC)
Re: reading NaNs Marcin 'Qrczak' Kowalczyk (24 Oct 2005 18:17 UTC)
Re: arithmetic issues bear (24 Oct 2005 06:13 UTC)
Re: arithmetic issues Taylor Campbell (24 Oct 2005 06:27 UTC)
Re: arithmetic issues Thomas Bushnell BSG (24 Oct 2005 07:49 UTC)
Re: arithmetic issues bear (24 Oct 2005 16:41 UTC)
Re: arithmetic issues Thomas Bushnell BSG (24 Oct 2005 07:49 UTC)
Re: arithmetic issues John.Cowan (22 Oct 2005 02:03 UTC)
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Re: +nan.0 problems bear (24 Oct 2005 06:04 UTC)
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Re: arithmetic issues Marcin 'Qrczak' Kowalczyk (23 Oct 2005 20:24 UTC)
Re: arithmetic issues Thomas Bushnell BSG (23 Oct 2005 20:30 UTC)
Re: arithmetic issues Marcin 'Qrczak' Kowalczyk (23 Oct 2005 22:25 UTC)
Re: arithmetic issues Thomas Bushnell BSG (23 Oct 2005 22:30 UTC)
Re: arithmetic issues Marcin 'Qrczak' Kowalczyk (21 Oct 2005 17:15 UTC)
Re: arithmetic issues Taylor Campbell (21 Oct 2005 20:24 UTC)
Re: arithmetic issues Thomas Bushnell BSG (21 Oct 2005 20:32 UTC)
Re: arithmetic issues Alan Watson (22 Oct 2005 00:26 UTC)
Re: arithmetic issues Marcin 'Qrczak' Kowalczyk (22 Oct 2005 00:45 UTC)

Re: arithmetic issues Jens Axel Søgaard 23 Oct 2005 20:01 UTC

Aubrey Jaffer wrote:
>  | From: Thomas Bushnell BSG <xxxxxx@becket.net>
>  | Date: Sun, 23 Oct 2005 12:39:43 -0700
>  |
>  | Aubrey Jaffer <xxxxxx@alum.mit.edu> writes:
>  |
>  | > When different NaNs are returned depending on the circumstances
>  | > creating them, I would like my implementation to display them
>  | > like this:
>  | >
>  | >   #<not-a-number expt>
>  |
>  | Sure, that seems fine.  We could mandate that as the readable written
>  | representation!
>
> It should *not* be a readable representation.  That serves only to
> mask mathematical errors in saved datasets.  As Bakul Shah wrote:
> "... IEEE754 says NaN is the result of an *invalid* operation, when an
> operation's operands lie outside its domain."

Say I want to write my own mathematical function and need to return NaN?
E.g.

   (if <check-arguments>
       <calculate-result>
       #<not-a-number>

is, to me, more readable than

   (if <check-arguments>
       <calculate-result>
       (/ 0.0 0.0))

--
Jens Axel Søgaard