From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Emanuel Berg Newsgroups: gmane.emacs.devel Subject: Re: Adding a generic mathematical library Date: Wed, 17 Jul 2024 07:58:32 +0200 Message-ID: <87le20a7av.fsf@dataswamp.org> References: <8734o9sdig.fsf@posteo.net> <87wmllqq66.fsf@posteo.net> <87plrdqnhc.fsf@posteo.net> <87le21qldj.fsf_-_@posteo.net> <878qy1at52.fsf@dataswamp.org> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="23455"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) To: emacs-devel@gnu.org Cancel-Lock: sha1:agrph1A9fBwlPGknFdC2vIliINo= Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Wed Jul 17 13:03:25 2024 Return-path: Envelope-to: ged-emacs-devel@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 1sU2RR-0005uS-RA for ged-emacs-devel@m.gmane-mx.org; Wed, 17 Jul 2024 13:03:25 +0200 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1sU2QY-0001Fg-Ef; Wed, 17 Jul 2024 07:02:30 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1sTxga-0004Xw-9q for emacs-devel@gnu.org; Wed, 17 Jul 2024 01:58:44 -0400 Original-Received: from ciao.gmane.io ([116.202.254.214]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1sTxgY-0006Xh-7V for emacs-devel@gnu.org; Wed, 17 Jul 2024 01:58:43 -0400 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1sTxgV-0000nW-UB for emacs-devel@gnu.org; Wed, 17 Jul 2024 07:58:39 +0200 X-Injected-Via-Gmane: http://gmane.org/ Mail-Followup-To: emacs-devel@gnu.org Mail-Copies-To: never Received-SPF: pass client-ip=116.202.254.214; envelope-from=ged-emacs-devel@m.gmane-mx.org; helo=ciao.gmane.io 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, HEADER_FROM_DIFFERENT_DOMAINS=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-Mailman-Approved-At: Wed, 17 Jul 2024 07:02:27 -0400 X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.devel:321746 Archived-At: Christopher Dimech wrote: >> Yeah, I've pushed for a math library for a long time. >> >> I have several files that are very close to that (for stats, >> time, permutations and so on) but I also have a math.el which >> I yank below if any of it can be used. > > Tools for permutations would be of much benefit. ;;; -*- lexical-binding: t -*- ;; ;; this file: ;; https://dataswamp.org/~incal/emacs-init/perm.el (require 'cl-lib) (require 'spell) ;; Christoph Conrad @ https://www.emacswiki.org/emacs/StringPermutations (defun perms (l) (if l (cl-mapcan (lambda (a) (cl-mapcan (lambda (p) (list (cons a p))) (perms (cl-remove a l :count 1)) )) l) '(()) )) (defun string-perms (str) (let*((chars (string-to-list str)) (char-perms (perms chars)) ) (mapcar (lambda (a) (concat a) ) char-perms) )) ;; (string-perms "hte") ; ("hte" "het" "the" "teh" "eht" "eth") (defun string-perms-filter (str) (let ((strs (cl-remove-duplicates (cl-remove-if-not (lambda (w) (spell-word w)) (string-perms str)) :test #'string=) )) (if (= 1 (length strs)) (car strs) strs) )) ;; eht kudtce pigelsen tagni ogod seot erontuf si ni fo hte ;; ;; (string-perms-filter "ogod") ; good ;; (string-perms-filter "erontuf") ; fortune ;; (string-perms-filter "si") ; is ;; (string-perms-filter "kudtce") ; tucked ;; (string-perms-filter "ni") ; in ;; (string-perms-filter "eth") ; the ;; (string-perms-filter "seot") ; toes ;; (string-perms-filter "fo") ; of ;; (string-perms-filter "hte") ; the ;; (string-perms-filter "pigelsen") ; ("peelings" "sleeping") ;; (string-perms-filter "tagni") ; giant ;; (string-perms-filter "emacs") (defun factorial (n) (if (> n 1) (* n (factorial (1- n))) 1)) ;; (factorial 5) ; 120 ;; (factorial 10) ; 3 628 800 (defun cl-factorial (n) (cl-loop with prod = 1 for i from 2 to n do (setq prod (* i prod)) finally return prod) ) ;; (cl-factorial 5) ; 120 ;; (cl-factorial 10) ; 3 628 800 (defun product-string (str) (let*((str-list (string-to-list str)) (str-list-no-dups (cl-remove-duplicates str-list)) (prod 1) ) (dolist (e str-list-no-dups) (setq prod (* prod (cl-factorial (cl-count e str-list)))) ) prod )) ;; (product-string "ogod") ; 2 (defun perms-string-num (str) (let ((n (cl-factorial (length str))) (r (product-string str)) ) (/ n r) )) ;; (perms-string-num "ogod") ; 12 ;; (perms-string-num "kudtce") ; 720 (provide 'perm) -- underground experts united https://dataswamp.org/~incal