From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: pjb@informatimago.com (Pascal J. Bourguignon) Newsgroups: gmane.emacs.help Subject: Re: Extract sublists Date: Wed, 18 Nov 2009 23:19:46 +0100 Organization: Informatimago Message-ID: <87my2jiigt.fsf@galatea.local> References: NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit X-Trace: ger.gmane.org 1258584106 16120 80.91.229.12 (18 Nov 2009 22:41:46 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Wed, 18 Nov 2009 22:41:46 +0000 (UTC) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Wed Nov 18 23:41:39 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 1NAtDU-0007cQ-0x for geh-help-gnu-emacs@m.gmane.org; Wed, 18 Nov 2009 23:41:36 +0100 Original-Received: from localhost ([127.0.0.1]:46095 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1NAtDT-0006gZ-9J for geh-help-gnu-emacs@m.gmane.org; Wed, 18 Nov 2009 17:41:35 -0500 Original-Path: news.stanford.edu!usenet.stanford.edu!news.glorb.com!news2.glorb.com!news.glorb.com!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail Original-Newsgroups: gnu.emacs.help Original-Lines: 27 Original-X-Trace: individual.net jWKz3Jvmo4rT+QOx6+t/Fwhblz8BOe/thxqvcs/OE+nmUIo8G+ Cancel-Lock: sha1:NzUwMDI5MTc4YThjNDE1NjczYWIzNmU4YjM5ZjcwMGMwMWIyYTI5ZA== sha1:leYkThAUdOscgwxIsUIAm5QfWts= Face: iVBORw0KGgoAAAANSUhEUgAAADAAAAAwAQMAAABtzGvEAAAABlBMVEUAAAD///+l2Z/dAAAA oElEQVR4nK3OsRHCMAwF0O8YQufUNIQRGIAja9CxSA55AxZgFO4coMgYrEDDQZWPIlNAjwq9 033pbOBPtbXuB6PKNBn5gZkhGa86Z4x2wE67O+06WxGD/HCOGR0deY3f9Ijwwt7rNGNf6Oac l/GuZTF1wFGKiYYHKSFAkjIo1b6sCYS1sVmFhhhahKQssRjRT90ITWUk6vvK3RsPGs+M1RuR mV+hO/VvFAAAAABJRU5ErkJggg== X-Accept-Language: fr, es, en X-Disabled: X-No-Archive: no Importance: high User-Agent: Gnus/5.1008 (Gnus v5.10.8) Emacs/22.3 (darwin) Original-Xref: news.stanford.edu gnu.emacs.help:174815 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:69889 Archived-At: Nordlöw writes: > Is there a function for extracting sublists of lists? > > If not here is my suggestion for inclusion in Emacs. > > (defun sublist (list from to) > "Return a sublist of LIST, from FROM to TO. > Counting starts at 0. Like `substring' but for lists." > (let (rtn (c from)) > (setq list (nthcdr from list)) > (while (and list (< c to)) > (push (pop list) rtn) > (setq c (1+ c))) > (nreverse rtn))) (require 'cl) (list (subseq '(a b) 0 0) (subseq '(a b) 0 1) (subseq '(a b) 1 2) (subseq '(a b) 0 2)) --> (nil (a) (b) (a b)) -- __Pascal Bourguignon__