From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: dieter@duenenhof-wilhelm.de (H. Dieter Wilhelm) Newsgroups: gmane.emacs.help Subject: Getting used to Calc's Radian convention Date: Fri, 12 Sep 2014 08:47:18 +0200 Organization: The Church of Emacs Message-ID: <87d2b1cp3d.fsf@vsl28t2g.ww011> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: ger.gmane.org 1410504500 23187 80.91.229.3 (12 Sep 2014 06:48:20 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Fri, 12 Sep 2014 06:48:20 +0000 (UTC) Cc: Jay Belanger To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Fri Sep 12 08:48:12 2014 Return-path: Envelope-to: geh-help-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 1XSKeR-0000LH-Ks for geh-help-gnu-emacs@m.gmane.org; Fri, 12 Sep 2014 08:48:11 +0200 Original-Received: from localhost ([::1]:42912 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XSKeM-0004HN-3M for geh-help-gnu-emacs@m.gmane.org; Fri, 12 Sep 2014 02:48:06 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:37638) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XSKdw-00042h-4P for help-gnu-emacs@gnu.org; Fri, 12 Sep 2014 02:47:47 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1XSKdo-00036I-Ff for help-gnu-emacs@gnu.org; Fri, 12 Sep 2014 02:47:40 -0400 Original-Received: from plane.gmane.org ([80.91.229.3]:36487) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XSKdo-00036B-9u for help-gnu-emacs@gnu.org; Fri, 12 Sep 2014 02:47:32 -0400 Original-Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1XSKdm-0008VB-VY for help-gnu-emacs@gnu.org; Fri, 12 Sep 2014 08:47:30 +0200 Original-Received: from p4fd4e385.dip0.t-ipconnect.de ([79.212.227.133]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Fri, 12 Sep 2014 08:47:30 +0200 Original-Received: from dieter by p4fd4e385.dip0.t-ipconnect.de with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Fri, 12 Sep 2014 08:47:30 +0200 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 25 Original-X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: p4fd4e385.dip0.t-ipconnect.de User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3.93 (gnu/linux) Cancel-Lock: sha1:JszoXq+bjVeCV1q5RC0j5LP3JN0= X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 80.91.229.3 X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Original-Sender: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.help:99844 Archived-At: Hello (:-), Calc's unit convention of revolution per minute (rpm) is derived from the angular speed and not from a frequency. One does not need to type the factor of `2 pi' when calculating, for example, the circumferential velocity from the radius and some value in rpm. So far so good. But it has the slight aesthetic drawback that now the velocity turns out to be in units of radians. n <- 1 rpm r <- 1 m n r -> 2 pi rad m / min Since Radian is a base unit I can only get rid of it when dividing by `rad'. But I think a Radian is not a real physical unit and wouldn't it be consistent, when evaluating, to assign just the value of 1 to it? What are your thoughts? Dieter -- best wishes H. Dieter Wilhelm Darmstadt, Germany