From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Newsgroups: gmane.emacs.help Subject: Re: Lisp anime video Date: Sun, 29 Aug 2021 14:06:27 +0200 Message-ID: <20210829120627.GG18750@tuxteam.de> References: <874kb8akgd.fsf@zoho.eu> <20210829074031.GB18750@tuxteam.de> <871r6c8ybx.fsf@zoho.eu> <20210829100045.GD18750@tuxteam.de> <87h7f87c38.fsf@zoho.eu> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="3xoW37o/FfUZJwQG" Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="29365"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Mutt/1.5.21 (2010-09-15) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Sun Aug 29 14:07:29 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 1mKJay-0007RQ-98 for geh-help-gnu-emacs@m.gmane-mx.org; Sun, 29 Aug 2021 14:07:28 +0200 Original-Received: from localhost ([::1]:47492 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mKJax-0002sT-5j for geh-help-gnu-emacs@m.gmane-mx.org; Sun, 29 Aug 2021 08:07:27 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:49694) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mKJa8-0002qH-4k for help-gnu-emacs@gnu.org; Sun, 29 Aug 2021 08:06:36 -0400 Original-Received: from mail.tuxteam.de ([5.199.139.25]:52504) by eggs.gnu.org with esmtps (TLS1.2:DHE_RSA_AES_128_CBC_SHA1:128) (Exim 4.90_1) (envelope-from ) id 1mKJa1-0007HX-LT for help-gnu-emacs@gnu.org; Sun, 29 Aug 2021 08:06:35 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=tuxteam.de; s=mail; h=From:In-Reply-To:Content-Type:MIME-Version:References:Message-ID:Subject:To:Date; bh=gdRfz3U67QhUR1jWUywsQmjLVoGzjPSnFDBPY3Ehz2s=; b=SOTv5VjzaiQ4nHR/AxkHw+ZarVRKI/g2B8fhlYEpwkmrnBuz08o2rqrycVkOvjkYIq9x0i5e9vPy+Xhd3XcQIEmfhHsh+LJqkGqFRfUanIyB85alvRbmcqcaY3rZDWmlwVnzug0VghN2e3kB4Bsx2ePgUhJhRsvh+6Ik5Pb7y1Nts7Leywrd0/xStAZMliFaUxBFISSr05fNcF0HujF7C8y2RJhuWUXyFlx3HcFIyNctMB32X59kpQVOAlhu1DYdZZmjKNqyaCRpCvP3yau9hM+j2EkeLDvEzQCXemCHxDbtyfMurVbeZ82dfxtTMiG9TQPEJjGMwMqbAG1LgBN7Hw==; Original-Received: from tomas by mail.tuxteam.de with local (Exim 4.80) (envelope-from ) id 1mKJZz-0000hr-Cb for help-gnu-emacs@gnu.org; Sun, 29 Aug 2021 14:06:27 +0200 Content-Disposition: inline In-Reply-To: <87h7f87c38.fsf@zoho.eu> Received-SPF: pass client-ip=5.199.139.25; envelope-from=tomas@tuxteam.de; helo=mail.tuxteam.de X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_NONE=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:132813 Archived-At: --3xoW37o/FfUZJwQG Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Sun, Aug 29, 2021 at 12:57:15PM +0200, Emanuel Berg via Users list for t= he GNU Emacs text editor wrote: > tomas wrote: >=20 > >> ;; this file: > >> ;; https://dataswamp.org/~incal/scheme/fac.scm > >>=20 > >> (define (fac n) > >> (if (> n 1) > >> (* n (fac (- n 1))) > >> 1) ) > >>=20 > >> (fac 10) ; 3 628 800 > > > > That looks for me like a pretty reasonable value for (fac > > 10). Actually, more reasonable that any other value? >=20 > Yes, but I wrote that. In the video they show another piece of > code which doesn't work in MIT/GNU Scheme what I can see. So the difference is (1- n) vs (- n 1)? Why don't you say that, instead of letting people find out? Perhaps the function `1-' is just missing in "your" Scheme. You can have it with (def (1- n) (- n 1)) if you want :) Note: Guile knows about `1-'. Cheers - t --3xoW37o/FfUZJwQG Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iEYEARECAAYFAmEreEMACgkQBcgs9XrR2kadzgCePHq/YtOrmtowH2OAONVajjA5 KN4An39L55AJrfugY17Z76V31nw+cFA2 =vFUW -----END PGP SIGNATURE----- --3xoW37o/FfUZJwQG--