From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Heime Newsgroups: gmane.emacs.help Subject: Re: macro that uses local variables Date: Wed, 09 Aug 2023 03:09:48 +0000 Message-ID: <2kcpuxgFwdbvgqqotTGBbHttysXpd0MJePuWtRTrxgBSO8PDqktV4MC69COMYE_VgmtspvJoUPAFks7PmHC13rPKjh425adnexzHHReGgWc=@protonmail.com> References: <871qgenx1h.fsf@dataswamp.org> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="23609"; mail-complaints-to="usenet@ciao.gmane.io" Cc: help-gnu-emacs@gnu.org To: Emanuel Berg Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Wed Aug 09 05:10:39 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 1qTZao-0005uM-Lm for geh-help-gnu-emacs@m.gmane-mx.org; Wed, 09 Aug 2023 05:10:38 +0200 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qTZaB-0004xz-0B; Tue, 08 Aug 2023 23:09:59 -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 1qTZa9-0004xp-CA for help-gnu-emacs@gnu.org; Tue, 08 Aug 2023 23:09:57 -0400 Original-Received: from mail-4318.protonmail.ch ([185.70.43.18]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qTZa7-0002gf-GI for help-gnu-emacs@gnu.org; Tue, 08 Aug 2023 23:09:57 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=protonmail.com; s=protonmail3; t=1691550592; x=1691809792; bh=cIse9vurFlMvHKPwIEZqtuGX+0AmL9WcYz+l4bJymbI=; h=Date:To:From:Cc:Subject:Message-ID:In-Reply-To:References: Feedback-ID:From:To:Cc:Date:Subject:Reply-To:Feedback-ID: Message-ID:BIMI-Selector; b=Hf/OhmWYIFk9SeysMGAtn117HtYZJrVn+q0mZ5sMu2CMi+VqnkiZx/D5X4ClN+Lcy ev3MhMuuOq0X8XUsgIxUDUgZXo4cVN7r3gxR3/e5De+Y0v3EJMj+YMYeoCAIWSsAO2 F7N0TVWkwJcnMFPVwaT+4IS/pmUQJfW5Tj6d3TnmfTLe923SqXwfFf6AUtPLS+akPt rH6vc4o4DqfrYjK0WXONHaEWuyTuk7vpf227uOrZfCRmGNPMxH9qTGnwdHts0E4SKF rgQr92Kk9nwSbi3oO2Yjov1SexfEuIiYwrYlxU+by+qFW5quTegUifK5uHLW/17uat WwczznhqxUoCA== In-Reply-To: <871qgenx1h.fsf@dataswamp.org> Feedback-ID: 57735886:user:proton Received-SPF: pass client-ip=185.70.43.18; envelope-from=heimeborgia@protonmail.com; helo=mail-4318.protonmail.ch 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, FREEMAIL_FROM=0.001, SPF_HELO_PASS=-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: 2.1.29 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:144705 Archived-At: Sent with Proton Mail secure email. ------- Original Message ------- On Tuesday, August 8th, 2023 at 1:27 PM, Emanuel Berg = wrote: > Heime wrote: >=20 > > I am using the rocket equation in this macro [...] > >=20 > > (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))) ) >=20 >=20 > There is no reason to write a macro for this > simple computation. >=20 > > I want to change it such that the arguments are set as local > > variables >=20 >=20 > Lexical scope, defun, arguments, if need be `let'. It is > super easy. >=20 > 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 ... In the context of a macro, the 'let' command should happen outside tho macr= o quote. With the quote expression in the body. Am I right ? (defmacro booster-velocity-change (specific-impulse initial-mass final-mass) "Compute change of velocity using rocket equation." (let ( (gravity 9.81) ) `(* (* ,specific-impulse ,gravity) (log (mass-ratio ,initial-mass ,final-mass))) )) =20 > -- > underground experts united > https://dataswamp.org/~incal