From: Xavier Leroy <xavier.leroy@inria.fr>
To: caml-list@inria.fr
Subject: Re: [Caml-list] Is this a bug in Num.float_of_num ?
Date: Thu, 26 May 2016 10:57:41 +0200 [thread overview]
Message-ID: <5746BA85.4030100@inria.fr> (raw)
In-Reply-To: <5746B2C7.2030608@gmail.com>
On 26/05/2016 10:24, Mohamed Iguernlala wrote:
> Hi,
>
> I came to the following "stange" behavior when using the function
> float_of_num. I don't know if this should be considered as a bug,
> since this function has no specification (in num.mli *)
>
> The float "f = 6004799503160661. /. 18014398509481984." has an
> exact representation on 64 bits. Its value is
>
> 0.333333333333333314829616256247390992939472198486328125
>
> However, when using float_of_num to compute the float corresponding to
> the number above represented as a num, the result is slightly different.
float_of_ratio and float_of_num are very imprecise in OCaml 4.02 and
earlier. They were reimplemented in OCaml 4.03 in a way that should
give correct roundings. So, make sure you're using 4.03, and if the
bug is still there, please file a report on Mantis.
Best,
- Xavier Leroy
next prev parent reply other threads:[~2016-05-26 8:57 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-26 8:24 Mohamed Iguernlala
2016-05-26 8:57 ` Xavier Leroy [this message]
2016-05-26 9:16 ` Mohamed Iguernlala
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
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=5746BA85.4030100@inria.fr \
--to=xavier.leroy@inria.fr \
--cc=caml-list@inria.fr \
/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 NNTP newsgroup(s).