From unknown Sun Jun 22 07:52:22 2025 X-Loop: help-debbugs@gnu.org Subject: bug#24561: Unmathematical bc exponentiation behavior Resent-From: "Martens, Tobias" Original-Sender: "Debbugs-submit" Resent-CC: bug-coreutils@gnu.org Resent-Date: Wed, 28 Sep 2016 17:32:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: report 24561 X-GNU-PR-Package: coreutils X-GNU-PR-Keywords: To: 24561@debbugs.gnu.org X-Debbugs-Original-To: "bug-coreutils@gnu.org" Received: via spool by submit@debbugs.gnu.org id=B.147508388710435 (code B ref -1); Wed, 28 Sep 2016 17:32:02 +0000 Received: (at submit) by debbugs.gnu.org; 28 Sep 2016 17:31:27 +0000 Received: from localhost ([127.0.0.1]:38131 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1bpIha-0002iD-3l for submit@debbugs.gnu.org; Wed, 28 Sep 2016 13:31:27 -0400 Received: from eggs.gnu.org ([208.118.235.92]:42052) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1bpH6J-0000JL-PD for submit@debbugs.gnu.org; Wed, 28 Sep 2016 11:48:52 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1bpH6D-00074S-GX for submit@debbugs.gnu.org; Wed, 28 Sep 2016 11:48:46 -0400 X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on eggs.gnu.org X-Spam-Level: X-Spam-Status: No, score=0.8 required=5.0 tests=BAYES_50,HTML_MESSAGE autolearn=disabled version=3.3.2 Received: from lists.gnu.org ([2001:4830:134:3::11]:58887) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bpH6D-00074C-DH for submit@debbugs.gnu.org; Wed, 28 Sep 2016 11:48:45 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:33021) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bpH6B-000347-4s for bug-coreutils@gnu.org; Wed, 28 Sep 2016 11:48:44 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1bpH66-00073N-S0 for bug-coreutils@gnu.org; Wed, 28 Sep 2016 11:48:42 -0400 Received: from fmailer.gwdg.de ([134.76.11.16]:50752) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bpH66-00072C-Kl for bug-coreutils@gnu.org; Wed, 28 Sep 2016 11:48:38 -0400 Received: from [134.76.11.225] (helo=email.stud.uni-goettingen.de) by mailer.gwdg.de with esmtp (Exim 4.80) (envelope-from ) id 1bpH5x-0007wC-3W for bug-coreutils@gnu.org; Wed, 28 Sep 2016 17:48:29 +0200 Received: from UM-EXCDAG-S4.um.gwdg.de ([fe80::59c9:5d5d:733d:ab2c]) by UM-EXCHT-S1.um.gwdg.de ([134.76.11.225]) with mapi id 14.03.0301.000; Wed, 28 Sep 2016 17:48:28 +0200 From: "Martens, Tobias" Thread-Topic: Unmathematical bc exponentiation behavior Thread-Index: AQHSGZ/B7m8Eu+IHVkOIPXtum9I4cw== Date: Wed, 28 Sep 2016 15:48:27 +0000 Message-ID: <4EC529B6FF34D841908C748B8A20204F45CACBC0@um-excdag-s4.um.gwdg.de> Accept-Language: en-US, de-DE Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [134.76.168.244] Content-Type: multipart/alternative; boundary="_000_4EC529B6FF34D841908C748B8A20204F45CACBC0umexcdags4umgwd_" MIME-Version: 1.0 X-Virus-Scanned: (clean) by clamav X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6.x X-Received-From: 2001:4830:134:3::11 X-Spam-Score: -5.0 (-----) X-Mailman-Approved-At: Wed, 28 Sep 2016 13:31:25 -0400 X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: -5.0 (-----) --_000_4EC529B6FF34D841908C748B8A20204F45CACBC0umexcdags4umgwd_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hey, echo "-(1)^2" | bc 1 I would have expected -1. This behavior is unmathematical and very confusin= g, because otherwise bc acts quite logic. Not sure if it is mandated by POSIX, atleast I could not find it to be in t= he section of exponentiation operator. Was this ever discussed? Resolving "-(positive float)" to "(-1)*(positive float)" for intern calcula= tion seems more appropriate to me and would give the desired results. --_000_4EC529B6FF34D841908C748B8A20204F45CACBC0umexcdags4umgwd_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hey,

echo "-(1)^2" | bc
1

I would have expected -1. This behavior is unmathematical and very confusin= g, because otherwise bc acts quite logic.
Not sure if it is mandated by POSIX, atleast I could not find it to be in t= he section of exponentiation operator. Was this ever discussed?
Resolving "-(positive float)" to "(-1)*(positive float)"= ; for intern calculation seems more appropriate to me and would give the de= sired results.

--_000_4EC529B6FF34D841908C748B8A20204F45CACBC0umexcdags4umgwd_-- From unknown Sun Jun 22 07:52:22 2025 X-Loop: help-debbugs@gnu.org Subject: bug#24561: Unmathematical bc exponentiation behavior Resent-From: Andreas Schwab Original-Sender: "Debbugs-submit" Resent-CC: bug-coreutils@gnu.org Resent-Date: Wed, 28 Sep 2016 18:11:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 24561 X-GNU-PR-Package: coreutils X-GNU-PR-Keywords: To: "Martens\, Tobias" Cc: 24561@debbugs.gnu.org Received: via spool by 24561-submit@debbugs.gnu.org id=B24561.147508622013924 (code B ref 24561); Wed, 28 Sep 2016 18:11:02 +0000 Received: (at 24561) by debbugs.gnu.org; 28 Sep 2016 18:10:20 +0000 Received: from localhost ([127.0.0.1]:38142 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1bpJJE-0003cW-Dj for submit@debbugs.gnu.org; Wed, 28 Sep 2016 14:10:20 -0400 Received: from mail-out.m-online.net ([212.18.0.10]:51719) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1bpJJC-0003cL-3G for 24561@debbugs.gnu.org; Wed, 28 Sep 2016 14:10:18 -0400 Received: from frontend01.mail.m-online.net (unknown [192.168.8.182]) by mail-out.m-online.net (Postfix) with ESMTP id 3skm2c6jBVz3hjty; Wed, 28 Sep 2016 20:10:16 +0200 (CEST) Received: from localhost (dynscan1.mnet-online.de [192.168.6.68]) by mail.m-online.net (Postfix) with ESMTP id 3skm2c58rdzvhMG; Wed, 28 Sep 2016 20:10:16 +0200 (CEST) X-Virus-Scanned: amavisd-new at mnet-online.de Received: from mail.mnet-online.de ([192.168.8.182]) by localhost (dynscan1.mail.m-online.net [192.168.6.68]) (amavisd-new, port 10024) with ESMTP id Dx2eDpJ4tCNR; Wed, 28 Sep 2016 20:10:15 +0200 (CEST) X-Auth-Info: 3wxo41MIGzI+DfGrfhNuLgpYWI6lCzxZVN2NkPOeeL0qzx+ETcNgEwHG8k3OkReM Received: from igel.home (ppp-88-217-11-55.dynamic.mnet-online.de [88.217.11.55]) by mail.mnet-online.de (Postfix) with ESMTPA; Wed, 28 Sep 2016 20:10:15 +0200 (CEST) Received: by igel.home (Postfix, from userid 1000) id 6FFA62C30F5; Wed, 28 Sep 2016 20:10:15 +0200 (CEST) From: Andreas Schwab References: <4EC529B6FF34D841908C748B8A20204F45CACBC0@um-excdag-s4.um.gwdg.de> X-Yow: Is this BOISE?? Date: Wed, 28 Sep 2016 20:10:15 +0200 In-Reply-To: <4EC529B6FF34D841908C748B8A20204F45CACBC0@um-excdag-s4.um.gwdg.de> (Tobias Martens's message of "Wed, 28 Sep 2016 15:48:27 +0000") Message-ID: <871t03dhfc.fsf@linux-m68k.org> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/25.1 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-Spam-Score: -0.7 (/) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: -0.7 (/) On Sep 28 2016, "Martens, Tobias" wrote: > echo "-(1)^2" | bc > 1 > > I would have expected -1. This behavior is unmathematical and very confusing, because otherwise bc acts quite logic. > Not sure if it is mandated by POSIX Unary - has higher precedence than ^, thus it is parsed as (-(1))^2. Andreas. -- Andreas Schwab, schwab@linux-m68k.org GPG Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5 "And now for something completely different." From unknown Sun Jun 22 07:52:22 2025 X-Loop: help-debbugs@gnu.org Subject: bug#24561: Unmathematical bc exponentiation behavior Resent-From: Bernhard Voelker Original-Sender: "Debbugs-submit" Resent-CC: bug-coreutils@gnu.org Resent-Date: Wed, 28 Sep 2016 21:25:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 24561 X-GNU-PR-Package: coreutils X-GNU-PR-Keywords: To: "Martens, Tobias" , 24561@debbugs.gnu.org Received: via spool by 24561-submit@debbugs.gnu.org id=B24561.147509787331310 (code B ref 24561); Wed, 28 Sep 2016 21:25:01 +0000 Received: (at 24561) by debbugs.gnu.org; 28 Sep 2016 21:24:33 +0000 Received: from localhost ([127.0.0.1]:38228 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1bpMLA-00088w-Og for submit@debbugs.gnu.org; Wed, 28 Sep 2016 17:24:32 -0400 Received: from mout.kundenserver.de ([212.227.126.133]:57437) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1bpML8-00088i-PN for 24561@debbugs.gnu.org; Wed, 28 Sep 2016 17:24:31 -0400 Received: from [192.168.101.10] ([217.86.86.51]) by mrelayeu.kundenserver.de (mreue001) with ESMTPSA (Nemesis) id 0McMsh-1bXYPM3QGN-00JbPD; Wed, 28 Sep 2016 23:18:11 +0200 References: <4EC529B6FF34D841908C748B8A20204F45CACBC0@um-excdag-s4.um.gwdg.de> From: Bernhard Voelker Message-ID: <62e64bed-14bd-e7bb-4b15-5b79d014775b@bernhard-voelker.de> Date: Wed, 28 Sep 2016 23:18:10 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.3.0 MIME-Version: 1.0 In-Reply-To: <4EC529B6FF34D841908C748B8A20204F45CACBC0@um-excdag-s4.um.gwdg.de> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit X-Provags-ID: V03:K0:1S5poPrPflqdFnFo2x3/ZiD3rEtsFncugna4VCpUzUaKFo1AHwI rinxfe6xL8YB69ZnNLV8iRwpZiezk7aIbWWcEQK+52NxpIOsKB4zT2JGKevakj4aLoytN0y FOQ92u1DdveL/dk3HhBzqr1HTHOwFqwKMM7k5Sl1SmJI0J86DmKW8VxpyxP2uJn5CMmBc8b 6qP3QQU5WAlc7MPtAkx4w== X-UI-Out-Filterresults: notjunk:1;V01:K0:LGR26Bka+uA=:eGjHFSWXBdhAUPNFAK7+Np U7tojMhKwzZ8BeCDDKrbHd9pZZN4aW78ihE6ARv5AV9Uj2HZ5crUf8pqPXtN6LyRB0D+w9/Ao tceZlzpzQzRmP3HQh0c9dVUvxsEc+Ra5Bno/xtpJ3XIr7iR3BwEfZWjhv5tIo7FR8TAyKdSAp eUvgilnnGR3FGX2WJ19faKgh2l0g1qUBLl7rLyQiMWuW4jT6bAAoF6sxQg7Snufl31t3AR8FZ n/Zkf90zakR4aSe622EtbFfoTPxGbYKyoR1fNQafqRXbxD75R/ObxcwyJiYc3Oa20MgMpJq/z KqBl608j4bjPtRxQPRXtqjgPuc4IJrEarDlalnmtIurNhu5TM8FgTcg1Vi/qwBI8xJOXhGaL4 6Xaa3ybLCr6jzHsF16u6XKns2udnhRq+JJZjJox+bTjoDY8jgNy4PJzMyotiGOKNbPEA5InWK VfxUPAxxYkhkQZ4CS8y0PhDojiofs1285YWmwrkWrpAm41zFLYzyc8zQfXvMQXDVGtO5aMb35 hfJidXhamfi2NLfC7QnaXQBxrDNmuxkNQuRnoGO3iP8fxlvpS3SeFMx/+iYDyMx+ymgIppc2e CH5ABx1gCZvzcYW1mOwzOgzlScHsDe1JE+PmN7FXM32BEL8aR8oMrJehNt3ipLFFJix45uYNE H5e6dAHsou6F2S8jrBe01g62GP4tiDBCHZROZXl8BaGdQuaWXz075TYWzdsVySo1P8PeGt0xa 8HU8hVjKa8hKAETY X-Spam-Score: 0.5 (/) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: 0.5 (/) tag 24561 notabug close 24561 stop On 09/28/2016 05:48 PM, Martens, Tobias wrote: > echo "-(1)^2" | bc > 1 Andreas already gave the answer: operator precedence (see 'man bc'). Besides, bc(1) is not part of GNU coreutils, and a better address for such a report would have been "bug-bc@gnu.org". Therefore, I'm marking this as 'not a bug' here, closing the issue. Have a nice day, Berny From unknown Sun Jun 22 07:52:22 2025 X-Loop: help-debbugs@gnu.org Subject: bug#24561: Unmathematical bc exponentiation behavior Resent-From: Erik Auerswald Original-Sender: "Debbugs-submit" Resent-CC: bug-coreutils@gnu.org Resent-Date: Thu, 29 Sep 2016 06:53:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 24561 X-GNU-PR-Package: coreutils X-GNU-PR-Keywords: To: "Martens, Tobias" Cc: 24561@debbugs.gnu.org Received: via spool by 24561-submit@debbugs.gnu.org id=B24561.147513197032053 (code B ref 24561); Thu, 29 Sep 2016 06:53:02 +0000 Received: (at 24561) by debbugs.gnu.org; 29 Sep 2016 06:52:50 +0000 Received: from localhost ([127.0.0.1]:38432 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1bpVD7-0008Kv-VY for submit@debbugs.gnu.org; Thu, 29 Sep 2016 02:52:50 -0400 Received: from mailgw1.uni-kl.de ([131.246.120.220]:36529) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1bpVD6-0008Km-7f for 24561@debbugs.gnu.org; Thu, 29 Sep 2016 02:52:48 -0400 Received: from sushi.unix-ag.uni-kl.de (sushi.unix-ag.uni-kl.de [IPv6:2001:638:208:ef34:0:ff:fe00:65]) by mailgw1.uni-kl.de (8.14.4/8.14.4/Debian-8+deb8u1) with ESMTP id u8T6qkse032363 (version=TLSv1/SSLv3 cipher=ECDHE-RSA-AES256-SHA bits=256 verify=NOT); Thu, 29 Sep 2016 08:52:46 +0200 Received: from sushi.unix-ag.uni-kl.de (ip6-localhost [IPv6:::1]) by sushi.unix-ag.uni-kl.de (8.14.4/8.14.4/Debian-4+deb7u1) with ESMTP id u8T6qkKT019579 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Thu, 29 Sep 2016 08:52:46 +0200 Received: (from auerswal@localhost) by sushi.unix-ag.uni-kl.de (8.14.4/8.14.4/Submit) id u8T6qk0x019578; Thu, 29 Sep 2016 08:52:46 +0200 Date: Thu, 29 Sep 2016 08:52:46 +0200 From: Erik Auerswald Message-ID: <20160929065246.GA19467@unix-ag.uni-kl.de> References: <4EC529B6FF34D841908C748B8A20204F45CACBC0@um-excdag-s4.um.gwdg.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4EC529B6FF34D841908C748B8A20204F45CACBC0@um-excdag-s4.um.gwdg.de> User-Agent: Mutt/1.5.21 (2010-09-15) X-Spam-Score: -5.3 (-----) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: -5.3 (-----) Hi Tobias, On Wed, Sep 28, 2016 at 03:48:27PM +0000, Martens, Tobias wrote: > echo "-(1)^2" | bc > 1 > > I would have expected -1. This behavior is unmathematical and very > confusing, because otherwise bc acts quite logic. bc did exactly what you asked it to do. You probably meant to write: echo "-(1^2)" | bc Thanks, Erik -- If it ain't broke, don't fix it. 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[184.68.105.38]) by smtp.googlemail.com with ESMTPSA id b18-v6sm9805022pgg.88.2018.10.28.00.01.56 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sun, 28 Oct 2018 00:01:57 -0700 (PDT) To: control@debbugs.gnu.org From: Assaf Gordon Message-ID: Date: Sun, 28 Oct 2018 01:01:56 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.2.1 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Spam-Score: 2.0 (++) X-Spam-Report: Spam detection software, running on the system "debbugs.gnu.org", has NOT identified this incoming email as spam. The original message has been attached to this so you can view it or label similar future email. If you have any questions, see the administrator of that system for details. 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