From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Sergey Organov Newsgroups: gmane.emacs.help Subject: Re: Elisp function that performs numeric computations Date: Fri, 21 Jan 2022 16:03:41 +0300 Message-ID: References: <87czkoezg4.fsf@mbork.pl> <87wnittj13.fsf@zoho.eu> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="37689"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Fri Jan 21 15:07:03 2022 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 1nAuZC-0009gF-4n for geh-help-gnu-emacs@m.gmane-mx.org; Fri, 21 Jan 2022 15:07:02 +0100 Original-Received: from localhost ([::1]:36646 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1nAuZB-0005DO-5z for geh-help-gnu-emacs@m.gmane-mx.org; Fri, 21 Jan 2022 09:07:01 -0500 Original-Received: from eggs.gnu.org ([209.51.188.92]:60890) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nAta6-0008VC-Bx for help-gnu-emacs@gnu.org; Fri, 21 Jan 2022 08:03:57 -0500 Original-Received: from ciao.gmane.io ([116.202.254.214]:43568) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nAta5-0002s7-0b for help-gnu-emacs@gnu.org; Fri, 21 Jan 2022 08:03:54 -0500 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1nAta0-00075J-7j for help-gnu-emacs@gnu.org; Fri, 21 Jan 2022 14:03:48 +0100 X-Injected-Via-Gmane: http://gmane.org/ 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: 5 X-Spam_score: 0.5 X-Spam_bar: / X-Spam_report: (0.5 / 5.0 requ) BAYES_00=-1.9, DKIM_ADSP_CUSTOM_MED=0.001, FORGED_GMAIL_RCVD=1, FREEMAIL_FORGED_FROMDOMAIN=0.249, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.249, NML_ADSP_CUSTOM_MED=0.9, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no 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" Xref: news.gmane.io gmane.emacs.help:135476 Archived-At: Emanuel Berg via Users list for the GNU Emacs text editor writes: > fatiparty--- via Users list for the GNU Emacs text editor wrote: > >>>>>> "Compute depth to use." >>>>>> (interactive) >>>>>> >>>>>> (let* ( (j rptdepth) >>>>>> (w (- maxdepth j)) >>>>>> (p (+ w 1)) >>>>>> (r (mod (- depth maxdepth 1) p) ) >>>>>> (o (+ j r)) ) >>>>>> o)) >>>>>> >>>> >>>> I would like to adapt the function a little bit more. If >>>> depth <= maxdepth I want to set o=depth instead of >>>> performing the computation shown for the variable o. >>>> >>> >>> Did I get it right, I wonder? >>> >>> (defun test (depth maxdepth rptdepth) >>> (if (<= depth maxdepth) >>> depth >>> (+ rptdepth >>> (mod (- depth maxdepth 1) >>> (- maxdepth rptdepth -1))))) >>> >>> Is it how true (E)Lisp'er would write it? >>> >> >> What you have done is good. But although you have got to >> a simple solution, I want to code the more complicated >> solution for the case where let* is involved (within which >> local variables are defined). > > The reason there is no `let' (or `let*') in his code is > because there is no repitition of computation patterns ... > > As for "Is it how true (E)Lisp'er would write it?" I'd write > it, whatever it is, like this: > > (defun organov (dep top rep) > (if (<= dep top) > dep > (+ rep > (mod (1- (- dep top)) > (1+ (- top rep)) )))) Nice, thanks! Didn't know me could be cut to such a brief definition though :) -- Sergey Organov