From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DD55FEEC5 for ; Fri, 1 Mar 2024 00:53:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709254440; cv=none; b=XXKbZfGIsBZ+gqHbjbUm0HN3kL54uqN24xJZt/sMrGPs85U0bBM5yRVYC5fb/mX8COpTcBKLJeoSeYyjQMVQDAEUHUIcuHQ4x/ZJnU0eSku68xKlQl9fmzc8ZvDb5yP+PUyPQ+39HaKtSZi5GJVYoFQ1m7cAkX0zFJTS+LOC9XQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709254440; c=relaxed/simple; bh=0c5hKpJqUEcOC9wCT5Akof5mnCy6YZCvkDmF54JZK3o=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=g7RrqlrhqmIAYnKYWa/r9pVkK0k6c9wyJsD4o8mTfM+n8o8CFoTmhZ5tqfqB6opHMQIUAPdVMc5OT3XIWpF27ARHi5TYOIkZs/FkbkBgPhYtAxH51cBaj4b5n+ib/82PuA2wLURO23ND4eXa4e0pZkutw3A/JdfsKnuyxSPVZTU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=EwBLxray; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="EwBLxray" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 963C2C433F1; Fri, 1 Mar 2024 00:53:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1709254439; bh=0c5hKpJqUEcOC9wCT5Akof5mnCy6YZCvkDmF54JZK3o=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=EwBLxrayhsbUuAC9Vx5kSEDO5AYNGB4uQyR0yKujKfU7mdI7zuTpF+aypetd2Em7c dbIShlRGUsDDBuCAif6W2a+wTX9jitENYZCK5ESa2M/qyBPo8PHoiQfz2HJYYRVCuQ T6MhziMb2xZOShuFw261Nfr5FvsGIYBAqXXgnWPGFLSX3D9UIopPlQgsLGQ98fn62h tUAjN3HdRwapQwHEjRwIpOjkvGF8CUO/DWPiqsdcnqt6dhOVU2b3Sy5zZoPmxmKCb7 zdpqtCy0qv7zWsRKbVa+HS3g7J8fOipmWT11UbxOHl2JThJtn+bkRiGMiRWp+si+F3 YZZqJIj4avj/g== Date: Fri, 1 Mar 2024 01:53:49 +0100 From: Alejandro Colomar To: Morten Welinder Cc: linux-man@vger.kernel.org Subject: Re: Man page issues: logb, significand, cbrt, log2, log10, exp10 Message-ID: References: Precedence: bulk X-Mailing-List: linux-man@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="jVyI3CS3foJOwN6W" Content-Disposition: inline In-Reply-To: --jVyI3CS3foJOwN6W Content-Type: text/plain; protected-headers=v1; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Date: Fri, 1 Mar 2024 01:53:49 +0100 From: Alejandro Colomar To: Morten Welinder Cc: linux-man@vger.kernel.org Subject: Re: Man page issues: logb, significand, cbrt, log2, log10, exp10 Hi Morten, On Thu, Feb 29, 2024 at 07:28:10PM -0500, Morten Welinder wrote: > I came across some minor issues in some math man pages. >=20 > M. I'll reply to the others separately. [...] > exp10: > The man page probably should come with a warning not to use the > function for the time being. The implementation is pretty bad. For > example, results for integer arguments 3, 4, 7, 8, 9, and 17 are > needlessly inaccurate. I can't reproduce that. alx@debian:~/tmp$ cat exp10.c=20 #define _GNU_SOURCE #include #include int main(void) { printf("exp10(17): %lf\n", exp10(17)); printf("pow(10, 17): %lf\n", pow(10, 17)); } alx@debian:~/tmp$ gcc -Wall -Wextra exp10.c -lm alx@debian:~/tmp$ ./a.out=20 exp10(17): 100000000000000000.000000 pow(10, 17): 100000000000000000.000000 I'm running libc6 2.37-15. > pow(10,x) is much better, but not perfect. Have a lovely night! Alex --=20 Looking for a remote C programming job at the moment. --jVyI3CS3foJOwN6W Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEE6jqH8KTroDDkXfJAnowa+77/2zIFAmXhJx0ACgkQnowa+77/ 2zLVMRAAhafSqTpm9NtxxEOKUHSBUeqyOwgyO9pNlaoQ2KPanI24nMKVUCivjYRO SpYh2eplWyifBzaYnmm+uUOMe7gnbTDrkR20YcpY0u+1j9mv8JsJtlNRlhWiYzIX L+DZ1GoU/WXLk28EKBTUkQdeKguSR4IjI8O7EHVVrfyx4ZYTHpEAttjtDWCHSXNA p5xyWrXCB3kJiirsQiieTt2MpbXFC/kSUQnwzFxOGSzYkbRilJAzNnsDudn4GpbB K7YtrEY5CFKzDOXDY+ziFSRvxag3vbh+bzpbpzAPFSZvSVqEJHNtPyqx99+wceCp IfhFkC4HuuEh55VvLkHYDd483kLDAg7xbPRgHj4il65oUpBslvhBye9gpaY9oxwD RBWTfDgGOcVAPduCL9upMLU3ECoCqJI3QSx2WSKPhmhoK6/HPhnYFuYmOI3Tpuzo gOgrDuzXjAmL32TEfgv1meKk/SmkCGttYOmhP18gUkW14KwqwJEYRqyHTKOJNw+M +IYInzkueBWDOa7ET3d55xtCbD5cyJtCAkio1ow3ZwlyEFII1gVSClZp8xJ/3k3R dvdusYE5iRZ9tk1zYarrd5Fp6m8EqoTemjQIBGCFUvt0oZ3eD+OSzpWcQWKDlzJf KlzRgQ+mykO+FiQoHfz/3N1WttfQLfscUR0kc8ayCLZwPnCqLUQ= =Bx2k -----END PGP SIGNATURE----- --jVyI3CS3foJOwN6W--