From: Paul Zimmermann <Paul.Zimmermann@inria.fr>
To: DJ Delorie <dj@redhat.com>
Cc: alx@kernel.org, libc-alpha@sourceware.org
Subject: Re: [PATCH v2 3/3] manual: Cube roots are rarely representable
Date: Sat, 30 Mar 2024 08:07:32 +0100 [thread overview]
Message-ID: <p9u0sf08i4ej.fsf@coriandre.loria.fr> (raw)
In-Reply-To: <xnwmpk5zsv.fsf@greed.delorie.com> (message from DJ Delorie on Fri, 29 Mar 2024 20:27:44 -0400)
> From: DJ Delorie <dj@redhat.com>
> Cc: libc-alpha@sourceware.org
> Date: Fri, 29 Mar 2024 20:27:44 -0400
>
> Alejandro Colomar <alx@kernel.org> writes:
>
> > -These functions return the cube root of @var{x}. They cannot
> > -fail; every representable real value has a representable real cube root.
>
> > +These functions return the cube root of @var{x}. They cannot
> > +fail; every representable real value has a real cube root,
> > +and rounding it to a representable value
> > +never causes overflow nor underflow.
>
> Wording is OK but the $subject says the exact opposite...
It is fine to me. The subject says that the cube root of a floating-point
number is rarely a floating-point number, which is true: for a p-bit format,
only about 2^(p/3) numbers have an exact cube root.
Paul
next prev parent reply other threads:[~2024-03-30 7:07 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CANv4PNkVv_0eLgiSP3L_KfC-eZJaVLZ5AP1AGfD0GNrR5M4Hrg@mail.gmail.com>
[not found] ` <ZeEnJB96mMC5bfBz@debian>
[not found] ` <CANv4PNmMpiwfv5acr7U6VEVe7PE_AMTzkkpNoNN9jrtVzk_93Q@mail.gmail.com>
2024-03-02 21:54 ` Man page issues: logb, significand, cbrt, log2, log10, exp10 Alejandro Colomar
2024-03-03 2:02 ` Morten Welinder
2024-03-03 2:21 ` Alejandro Colomar
2024-03-03 11:46 ` Vincent Lefevre
2024-03-03 12:21 ` Alejandro Colomar
2024-03-03 22:26 ` Morten Welinder
2024-03-04 12:17 ` Adhemerval Zanella Netto
2024-03-05 16:12 ` [PATCH v2 0/3] manual/math.texi: logb(3) and cbrt(3) fixes Alejandro Colomar
2024-03-05 16:12 ` [PATCH v2 1/3] manual: logb(x) is floor(log2(fabs(x))) Alejandro Colomar
2024-03-29 22:08 ` DJ Delorie
2024-03-29 23:00 ` Alejandro Colomar
2024-03-05 16:12 ` [PATCH v2 2/3] manual: floor(log2(fabs(x))) has rounding errors Alejandro Colomar
2024-03-30 0:24 ` DJ Delorie
2024-03-30 9:27 ` Alejandro Colomar
2024-03-30 9:30 ` Alejandro Colomar
2024-03-30 9:47 ` Andreas Schwab
2024-03-05 16:12 ` [PATCH v2 3/3] manual: Cube roots are rarely representable Alejandro Colomar
2024-03-30 0:27 ` DJ Delorie
2024-03-30 7:07 ` Paul Zimmermann [this message]
2024-03-30 16:51 ` DJ Delorie
2024-03-30 18:42 ` Alejandro Colomar
2024-03-30 18:50 ` DJ Delorie
2024-03-30 19:07 ` Alejandro Colomar
2024-03-31 20:38 ` [PATCH v3 0/4] manual: arith.texi and math.texi fixes Alejandro Colomar
2024-03-31 20:38 ` [PATCH v3 1/4] manual: logb(x) is floor(log2(fabs(x))) Alejandro Colomar
2024-03-31 20:38 ` [PATCH v3 2/4] manual: floor(log2(fabs(x))) has rounding errors Alejandro Colomar
2024-03-31 20:38 ` [PATCH v3 3/4] manual: Clarify return value of cbrt(3) Alejandro Colomar
2024-04-01 18:57 ` DJ Delorie
2024-03-31 20:38 ` [PATCH v3 4/4] manual: significand() uses FLT_RADIX, not 2 Alejandro Colomar
2024-04-01 19:09 ` DJ Delorie
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/libc/involved.html
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=p9u0sf08i4ej.fsf@coriandre.loria.fr \
--to=paul.zimmermann@inria.fr \
--cc=alx@kernel.org \
--cc=dj@redhat.com \
--cc=libc-alpha@sourceware.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).