From: Luc Teirlinck <teirllm@dms.auburn.edu>
Cc: emacs-devel@gnu.org
Subject: Re: Q on NaN
Date: Fri, 24 Jun 2005 15:59:11 -0500 (CDT) [thread overview]
Message-ID: <200506242059.j5OKxBQ10901@raven.dms.auburn.edu> (raw)
In-Reply-To: <DNEMKBNJBGPAOPIJOOICGELCCJAA.drew.adams@oracle.com>
Drew Adams wrote:
That doesn't tell me how to test if `foobar' is a NaN. See my previous
email: I knew I could test `(equal foo 0.0e+Nan)', but I thought I would
need to test against all of the possible NaN values.
The GNU C library has an isnan macro. From Lisp you could do:
(defun nanp (obj)
"Return t if OBJ is a NaN; nil otherwise,"
(and (numberp obj) (/= obj obj)))
Sincerely,
Luc.
next prev parent reply other threads:[~2005-06-24 20:59 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-06-24 19:06 Q on NaN Drew Adams
2005-06-24 19:33 ` Drew Adams
2005-06-24 19:46 ` Drew Adams
2005-06-24 21:01 ` Eli Zaretskii
2005-06-24 20:26 ` Drew Adams
2005-06-24 20:56 ` Gaëtan LEURENT
2005-06-24 20:59 ` Luc Teirlinck [this message]
2005-06-24 22:03 ` Eli Zaretskii
2005-06-24 21:49 ` Drew Adams
2005-06-24 22:31 ` Luc Teirlinck
2005-06-24 22:54 ` Drew Adams
2005-06-25 13:35 ` Richard M. Stallman
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