From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Jean Louis Newsgroups: gmane.emacs.help Subject: Re: What is 0.01 here not 0.01 here 0.009999999999999? Date: Fri, 2 Apr 2021 20:07:43 +0300 Message-ID: References: <837dlkg4xq.fsf@gnu.org> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="25457"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Mutt/2.0.6 (2021-03-06) Cc: help-gnu-emacs@gnu.org To: Eli Zaretskii Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Fri Apr 02 19:14:00 2021 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1lSNMu-0006UH-FF for geh-help-gnu-emacs@m.gmane-mx.org; Fri, 02 Apr 2021 19:14:00 +0200 Original-Received: from localhost ([::1]:37242 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lSNMt-0000Qy-DU for geh-help-gnu-emacs@m.gmane-mx.org; Fri, 02 Apr 2021 13:13:59 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:39694) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lSNLw-0000Pi-8l for help-gnu-emacs@gnu.org; Fri, 02 Apr 2021 13:13:01 -0400 Original-Received: from stw1.rcdrun.com ([217.170.207.13]:51265) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lSNLq-0002hG-GO; Fri, 02 Apr 2021 13:12:59 -0400 Original-Received: from localhost ([::ffff:41.202.241.42]) (AUTH: PLAIN securesender, TLS: TLS1.3,256bits,ECDHE_RSA_AES_256_GCM_SHA384) by stw1.rcdrun.com with ESMTPSA id 000000000001E079.0000000060675092.00005321; Fri, 02 Apr 2021 10:12:49 -0700 Mail-Followup-To: Eli Zaretskii , help-gnu-emacs@gnu.org Content-Disposition: inline In-Reply-To: <837dlkg4xq.fsf@gnu.org> Received-SPF: pass client-ip=217.170.207.13; envelope-from=bugs@gnu.support; helo=stw1.rcdrun.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.23 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-mx.org@gnu.org Original-Sender: "help-gnu-emacs" Xref: news.gmane.io gmane.emacs.help:128814 Archived-At: * Eli Zaretskii [2021-04-02 17:03]: > Suggested reading: > > https://www.itu.dk/~sestoft/bachelor/IEEE754_article.pdf Thank you, I will read. From: https://en.wikipedia.org/wiki/Floating-point_arithmetic#Accuracy_problems It seem that floating point arithmetic is killer at certain situations, so I will just make sure not to fiddle with missiles. Incidents On 25 February 1991, a loss of significance in a MIM-104 Patriot missile battery prevented it from intercepting an incoming Scud missile in Dhahran, Saudi Arabia, contributing to the death of 28 soldiers from the U.S. Army's 14th Quartermaster Detachment.