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: Floating Point computations in elisp Date: Fri, 18 Dec 2020 21:21:50 +0300 Message-ID: References: <87mtybyrd1.fsf@zoho.eu> 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="26518"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Mutt/2.0 (3d08634) (2020-11-07) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Fri Dec 18 19:32:32 2020 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 1kqKYJ-0006nX-IJ for geh-help-gnu-emacs@m.gmane-mx.org; Fri, 18 Dec 2020 19:32:31 +0100 Original-Received: from localhost ([::1]:36800 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kqKYI-0001rT-JN for geh-help-gnu-emacs@m.gmane-mx.org; Fri, 18 Dec 2020 13:32:30 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:51900) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kqKS2-0007pp-Bc for help-gnu-emacs@gnu.org; Fri, 18 Dec 2020 13:26:02 -0500 Original-Received: from stw1.rcdrun.com ([217.170.207.13]:55079) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kqKS0-00026V-Dh for help-gnu-emacs@gnu.org; Fri, 18 Dec 2020 13:26:01 -0500 Original-Received: from localhost ([::ffff:41.202.241.37]) (AUTH: PLAIN securesender, TLS: TLS1.2,256bits,ECDHE_RSA_AES_256_GCM_SHA384) by stw1.rcdrun.com with ESMTPSA id 000000000001E537.000000005FDCF435.00002CF0; Fri, 18 Dec 2020 11:25:57 -0700 Content-Disposition: inline In-Reply-To: <87mtybyrd1.fsf@zoho.eu> 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:126520 Archived-At: * Emanuel Berg via Users list for the GNU Emacs text editor [2020-12-18 20:09]: > (defun compute-space-distance (dist num-beams beam-width) > (let*((spaces (1+ num-beams)) > (dist-covered (* num-beams beam-width)) > (dist-uncovered (- dist dist-covered)) > (space (/ dist-uncovered spaces 1.0) )) > space )) > > ;; (insert (format "\n;; %.2f" (compute-space-distance 262 16 12))) > ;; 4.12 If I wish to arrive to Tau Ceti from Earth and it is maybe 11.8 light years distant, how many years do I need to get there provided I trave 5,000 km per hour?