From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Jay Belanger Newsgroups: gmane.emacs.bugs Subject: bug#19582: 25.0.50; [PATCH] Calc: glitches with negation of units Date: Tue, 13 Jan 2015 10:34:46 -0600 Message-ID: <87bnm263mh.fsf@vh213601.truman.edu> References: <851tmyah3n.fsf@iznogoud.viz> <87k30q65gp.fsf@vh213601.truman.edu> <85egqy8yaq.fsf@iznogoud.viz> <87fvbe64wz.fsf@vh213601.truman.edu> <85387e8x70.fsf@iznogoud.viz> Reply-To: jay.p.belanger@gmail.com NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: ger.gmane.org 1421166982 17662 80.91.229.3 (13 Jan 2015 16:36:22 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Tue, 13 Jan 2015 16:36:22 +0000 (UTC) Cc: 19582@debbugs.gnu.org To: Wolfgang Jenkner Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Tue Jan 13 17:36:16 2015 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1YB4Ry-0007Xd-Rz for geb-bug-gnu-emacs@m.gmane.org; Tue, 13 Jan 2015 17:36:15 +0100 Original-Received: from localhost ([::1]:40108 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YB4Ry-0000CV-0y for geb-bug-gnu-emacs@m.gmane.org; Tue, 13 Jan 2015 11:36:14 -0500 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:35248) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YB4Rr-00007x-CR for bug-gnu-emacs@gnu.org; Tue, 13 Jan 2015 11:36:08 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1YB4Rm-0002VV-9x for bug-gnu-emacs@gnu.org; Tue, 13 Jan 2015 11:36:07 -0500 Original-Received: from debbugs.gnu.org ([140.186.70.43]:46771) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YB4Rm-0002VQ-6y for bug-gnu-emacs@gnu.org; Tue, 13 Jan 2015 11:36:02 -0500 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.80) (envelope-from ) id 1YB4Rm-0004js-0y for bug-gnu-emacs@gnu.org; Tue, 13 Jan 2015 11:36:02 -0500 X-Loop: help-debbugs@gnu.org Resent-From: Jay Belanger Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Tue, 13 Jan 2015 16:36:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 19582 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: patch Original-Received: via spool by 19582-submit@debbugs.gnu.org id=B19582.142116694818193 (code B ref 19582); Tue, 13 Jan 2015 16:36:01 +0000 Original-Received: (at 19582) by debbugs.gnu.org; 13 Jan 2015 16:35:48 +0000 Original-Received: from localhost ([127.0.0.1]:55632 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1YB4RY-0004jN-1y for submit@debbugs.gnu.org; Tue, 13 Jan 2015 11:35:48 -0500 Original-Received: from uranium.truman.edu ([150.243.165.76]:38167) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1YB4RV-0004j5-OP for 19582@debbugs.gnu.org; Tue, 13 Jan 2015 11:35:46 -0500 Original-Received: from vh213601.truman.edu (vh213601.truman.edu [150.243.162.59]) (using TLSv1 with cipher DHE-RSA-AES128-SHA (128/128 bits)) (No client certificate requested) by uranium.truman.edu (Postfix) with ESMTPS id 09D5F4C1C8; Tue, 13 Jan 2015 10:35:27 -0600 (CST) In-Reply-To: <85387e8x70.fsf@iznogoud.viz> (Wolfgang Jenkner's message of "Tue, 13 Jan 2015 17:25:23 +0100") User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/25.0.50 (gnu/linux) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 140.186.70.43 X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Original-Sender: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.bugs:98312 Archived-At: >> Since 100 and (float 1 2) aren't the same, that might be a bug of some >> kind. > > Sure, but > > (math-equal 100 '(float 1 2)) => t > > and (info "(calc) Predicates") states > > -- Function: math-equal x y > Returns true if X and Y are numerically equal, either because they > are `equal', or because their difference is `zerop'. [...] > > so, IIUC, mathematically, they are as equal as it gets in calc. Ah, right. But the same calculations on the same objects should produce results which are equal, not just math-equal. > On the other hand, I'm not sure if calculations with (float ...) > are exact (if possible) in calc ? Calc will do the exact computations, since internally it uses base 10 to represents floats. Of course, the user might not consider (float ...)s to be exact.