From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Neon Absentius Newsgroups: gmane.emacs.help Subject: Non-Commutative calculations in Calc, Revisited Date: Tue, 4 Oct 2005 21:23:57 +0000 Message-ID: <20051004212357.GA992@SDF.LONESTAR.ORG> NNTP-Posting-Host: main.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Trace: sea.gmane.org 1128461184 24868 80.91.229.2 (4 Oct 2005 21:26:24 GMT) X-Complaints-To: usenet@sea.gmane.org NNTP-Posting-Date: Tue, 4 Oct 2005 21:26:24 +0000 (UTC) Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Tue Oct 04 23:26:12 2005 Return-path: Original-Received: from lists.gnu.org ([199.232.76.165]) by ciao.gmane.org with esmtp (Exim 4.43) id 1EMuHN-0005hk-G3 for geh-help-gnu-emacs@m.gmane.org; Tue, 04 Oct 2005 23:24:53 +0200 Original-Received: from localhost ([127.0.0.1] helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1EMuHN-0006JG-30 for geh-help-gnu-emacs@m.gmane.org; Tue, 04 Oct 2005 17:24:53 -0400 Original-Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1EMuH9-0006Io-2d for help-gnu-emacs@gnu.org; Tue, 04 Oct 2005 17:24:39 -0400 Original-Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1EMuH7-0006IX-Jl for help-gnu-emacs@gnu.org; Tue, 04 Oct 2005 17:24:38 -0400 Original-Received: from [199.232.76.173] (helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1EMuH7-0006IU-H9 for help-gnu-emacs@gnu.org; Tue, 04 Oct 2005 17:24:37 -0400 Original-Received: from [192.94.73.21] (helo=sdf.lonestar.org) by monty-python.gnu.org with esmtp (Exim 4.34) id 1EMuH6-0000oT-VX for help-gnu-emacs@gnu.org; Tue, 04 Oct 2005 17:24:37 -0400 Original-Received: from sdf.lonestar.org (IDENT:absent@ukato.freeshell.org [192.94.73.7]) by sdf.lonestar.org (8.13.1/8.12.10) with ESMTP id j94LNvmr004040 for ; Tue, 4 Oct 2005 21:23:57 GMT Original-Received: (from absent@localhost) by sdf.lonestar.org (8.13.1/8.12.8/Submit) id j94LNvqw001734 for help-gnu-emacs@gnu.org; Tue, 4 Oct 2005 21:23:57 GMT Original-To: help-gnu-emacs@gnu.org Mail-Followup-To: Neon Absentius , help-gnu-emacs@gnu.org Content-Disposition: inline User-Agent: Mutt/1.4.2.1i X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.help:29920 Archived-At: When in non-commutative (aka `matrix') mode calc calculates (a b)^-1 to be a^-1 b^-1 instead of the correct b^-1 a^-1. Actually there is a more general bug. It calculates (a b)^n to be a^n b^n. I think this rule should be removed when a and be don't commute. Furthermore a special rule should be included that deals with the case n=-1. -- Everyone is so overwhelmed by the hospitality. And so many of the people in the arena here, you know, were underprivileged anyway, so this--this (she chuckles slightly) is working very well for them. -- Barbara Bush, about the refugees from New Orleans.