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 14:07:52 +0300 Message-ID: References: <87sg8334mx.fsf@web.de> 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="16632"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Mutt/2.0 (3d08634) (2020-11-07) Cc: help-gnu-emacs@gnu.org To: Michael Heerdegen Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Fri Dec 18 12:22:25 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 1kqDq5-0004Fm-42 for geh-help-gnu-emacs@m.gmane-mx.org; Fri, 18 Dec 2020 12:22:25 +0100 Original-Received: from localhost ([::1]:51672 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kqDq4-0001p7-4H for geh-help-gnu-emacs@m.gmane-mx.org; Fri, 18 Dec 2020 06:22:24 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:53432) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kqDfD-0006Us-EI for help-gnu-emacs@gnu.org; Fri, 18 Dec 2020 06:11:13 -0500 Original-Received: from stw1.rcdrun.com ([217.170.207.13]:48001) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kqDf3-0005ib-4Y for help-gnu-emacs@gnu.org; Fri, 18 Dec 2020 06:11:10 -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 000000000001E00D.000000005FDC8E41.0000062E; Fri, 18 Dec 2020 04:10:57 -0700 Content-Disposition: inline In-Reply-To: <87sg8334mx.fsf@web.de> 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:126494 Archived-At: * Michael Heerdegen [2020-12-18 11:23]: > Christopher Dimech writes: > > > How can I do floating point computations in elisp > > > > (setq frc (/ tpd 60.0)) > > Like (/ (float tpd) 60.0). Thank you. But in the above example there is decimal 60.0 that would do the same result. (eql (/ (float 1) 60.0) (/ 1 60.0)) (eql (/ (float 20) 60.0) (/ 20 60.0)) While this would not be same: (eql (/ 20 (float 60)) (/ 20 60)) because I did not know `float' I was always adding or using something like 1.0 in divisions, like: (/ 10 30 1.0) to get the same effect. Now when I know `float' I could use: (/ (float 10) 30) As it is more descriptive, it gives maybe more explanation in the code on WHY, as inserting 1.0 there does not necessarily makes it clear WHY.