From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Emanuel Berg Newsgroups: gmane.emacs.help Subject: program to compute gears, with table Date: Fri, 08 Sep 2017 07:33:09 +0200 Organization: Aioe.org NNTP Server Message-ID: <86bmmlu54a.fsf@zoho.com> NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: blaine.gmane.org 1504848972 13945 195.159.176.226 (8 Sep 2017 05:36:12 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Fri, 8 Sep 2017 05:36:12 +0000 (UTC) User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.4 (gnu/linux) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Fri Sep 08 07:35:54 2017 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1dqBx5-00029j-Ew for geh-help-gnu-emacs@m.gmane.org; Fri, 08 Sep 2017 07:35:39 +0200 Original-Received: from localhost ([::1]:43385 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dqBxC-0005uW-ME for geh-help-gnu-emacs@m.gmane.org; Fri, 08 Sep 2017 01:35:46 -0400 Original-Path: usenet.stanford.edu!goblin2!goblin.stu.neva.ru!aioe.org!.POSTED!not-for-mail Original-Newsgroups: gnu.emacs.help,rec.bicycles.tech Original-Followup-To: gnu.emacs.help, rec.bicycles.tech Original-Lines: 61 Original-NNTP-Posting-Host: XiPr5pdukK7aCRjr/wfS1Q.user.gioia.aioe.org Original-X-Complaints-To: abuse@aioe.org Mail-Copies-To: never Cancel-Lock: sha1:XXkAlFd4UelXMLo4rQKLEetqLsY= X-Notice: Filtered by postfilter v. 0.8.2 Original-Xref: usenet.stanford.edu gnu.emacs.help:220087 rec.bicycles.tech:1003479 X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.21 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.org@gnu.org Original-Sender: "help-gnu-emacs" Xref: news.gmane.org gmane.emacs.help:114194 Archived-At: Hey guys, does this look right to you? ;; (print-gears '(34 50) '(12 13 15 17 19 21 23 25) 622) ;; ;; => ;; ;; 622 wheel ;; ;; chainring sprocket gear ;; ;; 34 25 2657.5360544880004 ;; 34 23 2888.626146182609 ;; 34 21 3163.7333982000005 ;; 34 19 3496.7579664315795 ;; 50 25 3908.1412566000004 ;; 34 17 3908.1412566000004 ;; 50 23 4247.97962673913 ;; 34 15 4429.226757480001 ;; 50 21 4652.549115000001 ;; 34 13 5110.64625863077 ;; 50 19 5142.291127105264 ;; 34 12 5536.5334468500005 ;; 50 17 5747.266553823531 ;; 50 15 6513.568761 ;; 50 13 7515.656262692309 ;; 50 12 8141.960951250001 (require 'cl-lib) (defun compute-gear (chainring sprocket wheel) (let*((pi 3.14159265) (radius (/ wheel 2.0)) (circum (* 2 radius pi)) (gear (* (/ chainring sprocket 1.0) circum))) (list chainring sprocket gear))) (defun gear (chainrings sprockets wheel) (let*((gears (cl-loop for c in chainrings append (cl-loop for s in sprockets collect (compute-gear c s wheel) ) ))) (cl-sort gears #'<= :key #'cl-caddr))) (defun print-gears (chainrings sprockets wheel) (let ((out-buffer (get-buffer-create "*Gears*"))) (with-current-buffer out-buffer (erase-buffer) (insert (format "%s wheel\n\n" wheel)) (insert "chainring sprocket gear\n\n") (let ((gears (gear chainrings sprockets wheel))) (cl-loop for g in gears do (let ((c ( car g)) (s ( cadr g)) (d (cl-caddr g))) (insert (format " %s %s %s\n" c s d)) )))) (pop-to-buffer out-buffer) )) -- underground experts united http://user.it.uu.se/~embe8573