From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Michael Heerdegen via "Emacs development discussions." Newsgroups: gmane.emacs.devel Subject: Re: Adding a generic mathematical library Date: Wed, 17 Jul 2024 09:56:06 +0200 Message-ID: <87frs8sb8p.fsf@web.de> References: <8734o9sdig.fsf@posteo.net> <87wmllqq66.fsf@posteo.net> <87plrdqnhc.fsf@posteo.net> <87le21qldj.fsf_-_@posteo.net> <87r0bssde4.fsf@web.de> Reply-To: Michael Heerdegen Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="35510"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) To: emacs-devel@gnu.org Cancel-Lock: sha1:5THY1+0mKdoZtigGCmrrneAh4TE= Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Wed Jul 17 09:55:53 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 1sTzVx-00095J-9R for ged-emacs-devel@m.gmane-mx.org; Wed, 17 Jul 2024 09:55:53 +0200 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1sTzVZ-0004N1-Uw; Wed, 17 Jul 2024 03:55:30 -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 1sTzVX-0004MR-Rl for emacs-devel@gnu.org; Wed, 17 Jul 2024 03:55:27 -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 1sTzVW-0001ra-4s for emacs-devel@gnu.org; Wed, 17 Jul 2024 03:55:27 -0400 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1sTzVT-0008Gg-DB for emacs-devel@gnu.org; Wed, 17 Jul 2024 09:55:23 +0200 X-Injected-Via-Gmane: http://gmane.org/ 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, FREEMAIL_FORGED_FROMDOMAIN=0.001, FREEMAIL_FROM=0.001, 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-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:321745 Archived-At: Michael Heerdegen via "Emacs development discussions." writes: > Have we considered to write a bit of glue code that would make it easier > and more convenient to use the things defined in Calc? Why invest all of > the time again? Here is what we already have in Emacs: Calc uses a dedicated format to represent math expressions. This line reads in such an expression (load Calc before eval'ing): #+begin_src emacs-lisp (car (calc-do-alg-entry "" "Calc expr: " t 'calc-quick-calc-history)) #+end_src If you enter for example "x + (10!+3)^2" this returns #+begin_src emacs-lisp (+ (var x var-x) (^ (+ (calcFunc-fact 10) 3) 2)) #+end_src Eval with `math-evaluate-expr': #+begin_src emacs-lisp (math-evaluate-expr '(+ (var x var-x) (^ (+ (calcFunc-fact 10) 3) 2))) ==> (+ (var x var-x) 13168211212809) #+end_src Again the result is using same representation of mathematical expressions. Use `math-format-value' to print the result: #+begin_src emacs-lisp (math-format-value '(+ (var x var-x) 13168211212809)) ==> "x + 13168211212809" #+end_src A new library will probably also need to invent a new dedicated type of expressions that is able to represent everything needed. I don't understand why it would be a good idea to start from scratch. Michael.