From: Kevin Ryde <user42@zip.com.au>
To: guile-devel@gnu.org
Subject: Re: asserting the equality of double values
Date: Tue, 18 Sep 2007 10:13:32 +1000 [thread overview]
Message-ID: <87k5qoal03.fsf@blah.blah> (raw)
In-Reply-To: <CMM.0.95.0.1189884022.beebe@psi.math.utah.edu> (Nelson H. F. Beebe's message of "Sat, 15 Sep 2007 13:20:22 -0600 (MDT)")
"Nelson H. F. Beebe" <beebe@math.utah.edu> writes:
>
> Subtracting one produces a significant of all
> 1-bits: 2**53 - 1 = +0x1.fffffffffffffp+52,
Yes.
> and that is the
> next-to-largest exactly representable whole number in this arithmetic
> system. Its floor is identical, so "x == floor()" is true.
Well, it's supposed to be. I think I put in that test. If it's failing
on alpha someone will want to dig around and see how it went wrong. It
ought to be pretty simple, all the values are integers, so no rounding
at all (and it hasn't even reached the actual scm_c_round).
_______________________________________________
Guile-devel mailing list
Guile-devel@gnu.org
http://lists.gnu.org/mailman/listinfo/guile-devel
next prev parent reply other threads:[~2007-09-18 0:13 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-09-15 17:53 asserting the equality of double values Kamaraju S Kusumanchi
2007-09-15 19:20 ` Nelson H. F. Beebe
2007-09-18 0:13 ` Kevin Ryde [this message]
2007-09-18 2:44 ` Kamaraju S Kusumanchi
2007-09-17 17:45 ` Stephen Compall
2007-09-18 2:45 ` Kamaraju S Kusumanchi
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/guile/
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=87k5qoal03.fsf@blah.blah \
--to=user42@zip.com.au \
--cc=guile-devel@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.
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).