From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Emanuel Berg via Users list for the GNU Emacs text editor Newsgroups: gmane.emacs.help Subject: math (was: Re: not good proposal: "C-z " reserved for users) Date: Sat, 13 Feb 2021 15:55:52 +0100 Message-ID: <87tuqg585j.fsf_-_@zoho.eu> References: <87y2ftroma.fsf@zoho.eu> <87y2fs2wyu.fsf@robertthorpeconsulting.com> <8735y06nap.fsf@zoho.eu> Reply-To: Emanuel Berg Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="30129"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) To: help-gnu-emacs@gnu.org Cancel-Lock: sha1:Ad+/BeMUrnBLnn/7LEoL51D4zNY= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Sat Feb 13 15:56:53 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 1lAwLs-0007k0-R6 for geh-help-gnu-emacs@m.gmane-mx.org; Sat, 13 Feb 2021 15:56:52 +0100 Original-Received: from localhost ([::1]:50048 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lAwLr-00078i-U0 for geh-help-gnu-emacs@m.gmane-mx.org; Sat, 13 Feb 2021 09:56:51 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:39008) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lAwL5-00078W-Nw for help-gnu-emacs@gnu.org; Sat, 13 Feb 2021 09:56:04 -0500 Original-Received: from ciao.gmane.io ([116.202.254.214]:50710) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lAwL3-0002dY-3M for help-gnu-emacs@gnu.org; Sat, 13 Feb 2021 09:56:03 -0500 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1lAwL0-0006kY-MD for help-gnu-emacs@gnu.org; Sat, 13 Feb 2021 15:55:58 +0100 X-Injected-Via-Gmane: http://gmane.org/ Mail-Followup-To: help-gnu-emacs@gnu.org Mail-Copies-To: never Received-SPF: pass client-ip=116.202.254.214; envelope-from=geh-help-gnu-emacs@m.gmane-mx.org; helo=ciao.gmane.io X-Spam_score_int: -15 X-Spam_score: -1.6 X-Spam_bar: - X-Spam_report: (-1.6 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.25, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no 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:127938 Archived-At: > Jean Louis wrote: > >> (defun pct-of-number-in-total (number total) >> "Return the percentage that NUMBER represents in a TOTAL." >> (let* ((percent (/ (float total) 100)) >> (percentage (/ (float number) percent))) >> percentage)) > > (defun percent (n d) > (let ((pct (* 100 (/ n d 1.0)))) > (message "%.1f%%" pct))) > > (percent 13973 204612) ; 6.8% The 1.0 and (float) just don't look good. Maybe one should do it onee time and be done with it. (defun // (n d) (/ n d 1.0) ) ;; (// 8 256) ; 0.03125 ;; (/ 8 256) ; 0 But maybe then people would think it (//) would correspond somehow to **, or `expt'... (defalias '** #'expt) and, it would require a lot of `require's from all over... but then one would get away with the unidiomatic 1.0s for good! https://dataswamp.org/~incal/emacs-init/math.el -- underground experts united http://user.it.uu.se/~embe8573 https://dataswamp.org/~incal