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RE: Edge case conversions, exceptions to IEEE FPA



Agreed, this is one of the things (like modal intervals) not  to be
included in the standard but rather to be kept in the back of our mind
so as the standard does not prevent us from implementing these
additional features (and if possible help in implementing them). 

-----Original Message-----
From: stds-1788@xxxxxxxx [mailto:stds-1788@xxxxxxxx] On Behalf Of R.
Baker Kearfott
Sent: Tuesday, November 11, 2008 9:10 AM
To: owner-stds-1788@xxxxxxxxxxxxxxxxx
Cc: stds-1788@xxxxxxxxxxxxxxxxx
Subject: Re: Edge case conversions, exceptions to IEEE FPA

Vladik et al,

I perceive that as something that would be completely new and would
entail a lot more work than what we have been discussing so far.
In particular, binary and decimal arithmetic, with directed roundings,
are already codified in IEEE 754-2008, and, except for possibly some
of the edge cases we have been discussing, the 754-2008 specifications
(including specifications of the directed rounding modes) can be used
directly in our interval standard.

Baker

Kreinovich, Vladik wrote:
> Probably not for this standard, but how about adding arbitrary
rational
> numbers to the standard? There have been some programming environments
> where we could manipulate exact rational numbers like 1/3, and they
> often occur as coefficients.
> 
> Of course, we can always treat them as 1.0 /3.0 with exactly
represented
> 1 and 3. 
> 
>


-- 

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R. Baker Kearfott,    rbk@xxxxxxxxxxxxx   (337) 482-5346 (fax)
(337) 482-5270 (work)                     (337) 993-1827 (home)
URL: http://interval.louisiana.edu/kearfott.html
Department of Mathematics, University of Louisiana at Lafayette
(Room 217 Maxim D. Doucet Hall, 1403 Johnston Street)
Box 4-1010, Lafayette, LA 70504-1010, USA
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