From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Barry Margolin Newsgroups: gmane.emacs.help Subject: Re: Basic questions about elisp Date: Fri, 06 Nov 2009 00:06:16 -0500 Organization: A noiseless patient Spider Message-ID: References: <1e9f8449-09ec-4a84-a332-9f05fadb8aa3@z41g2000yqz.googlegroups.com> <87iqdpdog1.fsf@galatea.local> NNTP-Posting-Host: lo.gmane.org X-Trace: ger.gmane.org 1257486074 4387 80.91.229.12 (6 Nov 2009 05:41:14 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Fri, 6 Nov 2009 05:41:14 +0000 (UTC) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Fri Nov 06 06:41:07 2009 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([199.232.76.165]) by lo.gmane.org with esmtp (Exim 4.50) id 1N6HZL-0005vl-9x for geh-help-gnu-emacs@m.gmane.org; Fri, 06 Nov 2009 06:41:07 +0100 Original-Received: from localhost ([127.0.0.1]:36335 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1N6HZK-0001Js-Nd for geh-help-gnu-emacs@m.gmane.org; Fri, 06 Nov 2009 00:41:06 -0500 Original-Path: news.stanford.edu!usenet.stanford.edu!news.tele.dk!news.tele.dk!small.news.tele.dk!newsgate.cistron.nl!newsgate.news.xs4all.nl!194.109.133.84.MISMATCH!newsfeed.xs4all.nl!newsfeed5.news.xs4all.nl!xs4all!feeder.news-service.com!188.40.43.213.MISMATCH!feeder.eternal-september.org!eternal-september.org!barmar.motzarella.org!not-for-mail Original-Newsgroups: gnu.emacs.help Original-Lines: 55 Original-X-Trace: news.eternal-september.org U2FsdGVkX18qwgS+d3Uup8ahPmcgUEmUShHfIKIkHz6waT4xW+V9BcdwBXpjX2ioqvb1Nn62WdjXhh52OVHqBjAeVQjMqrtwyPepUD77Z3u0Zd760Y+P7CCEiE7KOnBTfikCIpdB3E0= Original-X-Complaints-To: abuse@eternal-september.org Original-NNTP-Posting-Date: Fri, 6 Nov 2009 05:06:16 +0000 (UTC) User-Agent: MT-NewsWatcher/3.5.3b3 (Intel Mac OS X) X-Auth-Sender: U2FsdGVkX19oZiN1QOEt/3WdqTicHVQ6p3XD/hRtfno= Cancel-Lock: sha1:xC71Ie3Pg4Z9CH/3cbTrOfC9rhU= Original-Xref: news.stanford.edu gnu.emacs.help:174456 X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.help:69533 Archived-At: In article <87iqdpdog1.fsf@galatea.local>, pjb@informatimago.com (Pascal J. Bourguignon) wrote: > Francis Moreau writes: > > > Hello, > > > > I'm trying to learn elisp and have a couple of basic questions. > > > > I'm iterating over a list using dotimes, but in the body of dotimes, > dolist dolist > > > the list can mutate. For example I have: > > > > (dolist (elt lst) > > ;; some codes > > (nconc lst '(2))) > > This is an infinite loop. It will break when the program runs out of > memory. It also modifies a literal, which modifies the function itself (resulting in a circular list of (2 2 2 2 ...)). Change that nconc to: (nconc lst (list 2)) to avoid that. > > > > This adds/appends a new element to 'lst' list. It looks like 'dotimes' > dolist > > doesn't like it. > > If you are not careful, you won't be able to program... > > > > I also need to iterate over elements of a vector. I basically use a > > 'while' loop as above. Is there any helper to do that, I looked at > > "(elisp) Sequences Arrays Vectors" but found nothing appropriate. > > (require 'cl) > (loop for element in list do (something element)) > (loop for element across vector do (something element)) > > > > And finally, is it the good place to ask such questions about elisp ? > > Yes, it's right here. -- Barry Margolin, barmar@alum.mit.edu Arlington, MA *** PLEASE post questions in newsgroups, not directly to me *** *** PLEASE don't copy me on replies, I'll read them in the group ***