From: David Kastrup <dak@gnu.org>
Subject: Re: GNU Emacs 21.2.1 (i386-debian-linux-gnu, X toolkit, Xaw3d scroll bars) of 2002-3-22 on raven, modified by Debian
Date: 17 Apr 2003 01:54:03 +0200 [thread overview]
Message-ID: <x5d6jmq9r8.fsf@lola.goethe.zz> (raw)
In-Reply-To: mailman.4765.1050536031.21513.bug-gnu-emacs@gnu.org
Mark Barnes <mbarnes@pacifier.com> writes:
> If I enter this expression in a buffer
>
> (* 85 1.1)
>
> and evaluate it it using Ctrl-x-e, I get the following answer
> displayed in the minibuffer:
>
> 93.50000000000001
>
> If I evaluate this expression
>
> (- 93.5 (* 85 1.1))
>
> I get this answer in the minibuffer:
>
> -1.4210854715202004e-14
>
> Is this documented in the reference manual? I was unable to find
> anything about this kind of problem.
It is a facet of the well-known fact of life that 10*0.1 hardly ever
is 1.0.
In short: numerics. 0.1 has no exact representation in binary
floating point numbers.
--
David Kastrup, Kriemhildstr. 15, 44793 Bochum
next parent reply other threads:[~2003-04-16 23:54 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <mailman.4765.1050536031.21513.bug-gnu-emacs@gnu.org>
2003-04-16 23:54 ` David Kastrup [this message]
2003-04-16 23:33 GNU Emacs 21.2.1 (i386-debian-linux-gnu, X toolkit, Xaw3d scroll bars) of 2002-3-22 on raven, modified by Debian Mark Barnes
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
List information: https://www.gnu.org/software/emacs/
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=x5d6jmq9r8.fsf@lola.goethe.zz \
--to=dak@gnu.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this public inbox
https://git.savannah.gnu.org/cgit/emacs.git
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).