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From: Martin <martin.dowie@btopenworld.com>
Subject: Re: About the F-22 software bug
Date: Sat, 6 Feb 2010 01:28:56 -0800 (PST)
Date: 2010-02-06T01:28:56-08:00	[thread overview]
Message-ID: <7e6ceef0-7f7e-4463-ae99-11749ee2e717@r24g2000yqd.googlegroups.com> (raw)
In-Reply-To: 59ac140e-8e74-4dee-89b7-8f23c9d95645@d27g2000yqn.googlegroups.com

On Feb 5, 4:50 pm, Hibou57 (Yannick Duchêne)
<yannick_duch...@yahoo.fr> wrote:
> On 5 fév, 11:31, "Dmitry A. Kazakov" <mail...@dmitry-kazakov.de>
> wrote:
>
> > And shift does not solve the problem anyway, if that existed. The potential
> > problem is that the angle is not a real number. It could be represented by
> > one, but then the operations like +, -, *, /, =, /= must be replaced and
> > ones like <, >, <=, >= disallowed.
>
> I would have thought for reals, operations like +, -, *, /, <, >, /=
> changed and =, <=, >= disallowed
> Is there something I don't understand ?

Longitude is cyclical - < and > only 'work' if there is a hard-stop at
each end.

You can make up some rules that might work for a project, e.g. 2
points are only ever compared using the shortest route between them
(and not the route that goes [almost] round the earth!) but it isn't
really an honest abstraction.

Cheers
-- Martin



  parent reply	other threads:[~2010-02-06  9:28 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-02-04 18:46 About the F-22 software bug Pascal Obry
     [not found] ` <4YKdnVFQX_suIPbWnZ2dnUVZ_rednZ2d@earthlink.com>
2010-02-05  6:51   ` Hibou57 (Yannick Duchêne)
2010-02-05  8:30   ` Martin
2010-02-05  8:52     ` Ludovic Brenta
2010-02-05  9:02       ` Martin
2010-02-05 10:31         ` Dmitry A. Kazakov
2010-02-05 11:18           ` Martin
2010-02-05 16:50           ` Hibou57 (Yannick Duchêne)
2010-02-05 18:19             ` Dmitry A. Kazakov
2010-02-06  9:28             ` Martin [this message]
2010-02-05 23:39         ` Phil Clayton
2010-02-06 12:12           ` sjw
2010-02-07 10:11             ` Martin
2010-02-06 15:30 ` jonathan
2010-02-06 16:35   ` Pascal Obry
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