From:	Damian Yerrick <Bullcr_pd_yerrick AT hotmail DOT comRemoveBullcr_p>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Weird results of log( -1.0 ) with libm.a and without libm.a
Organization:	Pin Eight Software http://pineight.8m.com/
Message-ID:	<ho4a6t8dauadtkugp92cphdb37o7jqh9s4@4ax.com>
References:	<Pine DOT SUN DOT 3 DOT 91 DOT 1010111191648 DOT 20014A-100000 AT is> <3a5e8f24$1 AT rpc1284 DOT daytonoh DOT ncr DOT com> <6480-Fri12Jan2001134540+0200-eliz AT is DOT elta DOT co DOT il> <3a62680d AT rpc1284 DOT daytonoh DOT ncr DOT com>
X-Newsreader:	Forte Agent 1.7/32.534
MIME-Version:	1.0
Lines:	28
X-Trace:	/KHlxN3IVOdahnnnNT6BhV9Ft5yphOmPTk8eccPlKo2eKVoBDap4oq9jMpKqFiHQfBidiVgwvPL+!Nl7exC+EzxqrLeXpJuqyB0gLYb/J47GwJuZsGWqVs/rBgdFNjirFmbeQITcKutAvcRSYnkcgbep9!BLC70A==
X-Complaints-To:	abuse AT gte DOT net
X-Abuse-Info:	Please be sure to forward a copy of ALL headers
X-Abuse-Info:	Otherwise we will be unable to process your complaint properly
NNTP-Posting-Date:	Wed, 17 Jan 2001 03:35:25 GMT
Distribution:	world
Date:	Wed, 17 Jan 2001 03:35:25 GMT
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp
Reply-To:	djgpp AT delorie DOT com

On Mon, 15 Jan 2001 10:00:49 +0700, "Tanes Sriviroolchai"
<Tanes DOT Sriviroolchai AT Thailand DOT NCR DOT COM> wrote:

>"Eli Zaretskii" <eliz AT is DOT elta DOT co DOT il> wrote in message
>news:6480-Fri12Jan2001134540+0200-eliz AT is DOT elta DOT co DOT il...
>>
>> You should be able to look at the bit pattern of the result and
>> compare it with NaN and Inf, if you don't believe isnan.
>
>No, I'm ok with all behavior of log() and isnan() in DJGPP. The only
>(small) problem is isnan() is not available in libc.a.

Get the libm sources (djlsr203.zip from Simtel) and pull out isnan()
if you feel that strongly.

>However, I can compare the result directly with NaN and Inf

You can't just do if(x == 0./0.) because there are several types
of NaN; each has a different non-zero characteristic.  +Inf can
be considered a NaN with a characteristic of all zero bits.

-- 
<O
( \   GNOME vs. KDE: the game!
 X    http://pineight.8m.com/nes.htm

This is McAfee VirusScan. Add these two lines to your signature to
prevent the spread of signature viruses.  http://www.mcafee.com/

- Raw text -