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.help Subject: Re: macro that uses local variables Date: Tue, 08 Aug 2023 03:27:22 +0200 Message-ID: <871qgenx1h.fsf@dataswamp.org> References: Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="37692"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) To: help-gnu-emacs@gnu.org Cancel-Lock: sha1:zTKal0Xy8fvgvgUV50EdjOASkLM= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Tue Aug 08 14:29:53 2023 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 1qTLqS-0009db-Qi for geh-help-gnu-emacs@m.gmane-mx.org; Tue, 08 Aug 2023 14:29:52 +0200 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qTLpr-0004j0-Ck; Tue, 08 Aug 2023 08:29:15 -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 1qTBVU-0006k8-EO for help-gnu-emacs@gnu.org; Mon, 07 Aug 2023 21:27:32 -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 1qTBVS-00055Z-OG for help-gnu-emacs@gnu.org; Mon, 07 Aug 2023 21:27:32 -0400 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1qTBVQ-0001kq-Pv for help-gnu-emacs@gnu.org; Tue, 08 Aug 2023 03:27:28 +0200 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: -16 X-Spam_score: -1.7 X-Spam_bar: - X-Spam_report: (-1.7 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-Mailman-Approved-At: Tue, 08 Aug 2023 08:28:56 -0400 X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.29 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-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.help:144691 Archived-At: Heime wrote: > I am using the rocket equation in this macro [...] > > (defmacro booster-velocity-change > (specific-impulse standard-gravity initial-mass final-mass) > "Compute change of velocity using rocket equation." > `(* (* ,specific-impulse ,standard-gravity) > (log (mass-ratio ,initial-mass ,final-mass))) ) There is no reason to write a macro for this simple computation. > I want to change it such that the arguments are set as local > variables Lexical scope, defun, arguments, if need be `let'. It is super easy. If you start thinking "how do I solve my problem?" instead of "how do I do in Emacs", everything will be much easier for you ... -- underground experts united https://dataswamp.org/~incal