From mboxrd@z Thu Jan 1 00:00:00 1970 Path: main.gmane.org!not-for-mail From: Kenichi Handa Newsgroups: gmane.emacs.devel Subject: Re: request for a new function, say, `sequence' Date: Thu, 3 Apr 2003 11:54:50 +0900 (JST) Sender: emacs-devel-bounces+emacs-devel=quimby.gnus.org@gnu.org Message-ID: <200304030254.LAA06098@etlken.m17n.org> References: <200303230302.MAA04327@etlken.m17n.org> <200303241541.h2OFfbpa011227@rum.cs.yale.edu> <200303250015.JAA06592@etlken.m17n.org> <200303250050.JAA06631@etlken.m17n.org> <200303250057.h2P0vBj6016367@rum.cs.yale.edu> <200303250125.KAA06703@etlken.m17n.org> <32627.1048557446@theforce.Stanford.EDU> <200303250208.LAA06802@etlken.m17n.org> <1191.1048560083@theforce.Stanford.EDU> <200303250446.NAA06974@etlken.m17n.org> <4946.1048568708@theforce.Stanford.EDU> <200303261218.VAA09242@etlken.m17n.org> NNTP-Posting-Host: main.gmane.org Mime-Version: 1.0 (generated by SEMI 1.14.3 - "Ushinoya") Content-Type: text/plain; charset=US-ASCII X-Trace: main.gmane.org 1049338996 24970 80.91.224.249 (3 Apr 2003 03:03:16 GMT) X-Complaints-To: usenet@main.gmane.org NNTP-Posting-Date: Thu, 3 Apr 2003 03:03:16 +0000 (UTC) Cc: ttn@glug.org Original-X-From: emacs-devel-bounces+emacs-devel=quimby.gnus.org@gnu.org Thu Apr 03 05:03:14 2003 Return-path: Original-Received: from quimby.gnus.org ([80.91.224.244]) by main.gmane.org with esmtp (Exim 3.35 #1 (Debian)) id 190v0U-0006UX-00 for ; Thu, 03 Apr 2003 05:03:14 +0200 Original-Received: from monty-python.gnu.org ([199.232.76.173]) by quimby.gnus.org with esmtp (Exim 3.12 #1 (Debian)) id 190v1q-0006id-00 for ; Thu, 03 Apr 2003 05:04:39 +0200 Original-Received: from localhost ([127.0.0.1] helo=monty-python.gnu.org) by monty-python.gnu.org with esmtp (Exim 4.10.13) id 190uzX-00024o-06 for emacs-devel@quimby.gnus.org; Wed, 02 Apr 2003 22:02:15 -0500 Original-Received: from list by monty-python.gnu.org with tmda-scanned (Exim 4.10.13) id 190uyN-0000iY-00 for emacs-devel@gnu.org; Wed, 02 Apr 2003 22:01:03 -0500 Original-Received: from mail by monty-python.gnu.org with spam-scanned (Exim 4.10.13) id 190uvx-0005c6-00 for emacs-devel@gnu.org; Wed, 02 Apr 2003 21:58:34 -0500 Original-Received: from tsukuba.m17n.org ([192.47.44.130]) by monty-python.gnu.org with esmtp (Exim 4.10.13) id 190usR-0002wR-00; Wed, 02 Apr 2003 21:54:55 -0500 Original-Received: from fs.m17n.org (fs.m17n.org [192.47.44.2])h332so915660; Thu, 3 Apr 2003 11:54:50 +0900 (JST) (envelope-from handa@m17n.org) Original-Received: from etlken.m17n.org (etlken.m17n.org [192.47.44.125]) h332soA19139; Thu, 3 Apr 2003 11:54:50 +0900 (JST) Original-Received: (from handa@localhost) by etlken.m17n.org (8.8.8+Sun/3.7W-2001040620) id LAA06098; Thu, 3 Apr 2003 11:54:50 +0900 (JST) Original-To: rms@gnu.org In-reply-to: (message from Richard Stallman on Wed, 26 Mar 2003 22:30:16 -0500) User-Agent: SEMI/1.14.3 (Ushinoya) FLIM/1.14.2 (Yagi-Nishiguchi) APEL/10.2 Emacs/21.2.92 (sparc-sun-solaris2.6) MULE/5.0 (SAKAKI) Original-cc: emacs-devel@gnu.org X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1b5 Precedence: list List-Id: Emacs development discussions. List-Help: List-Post: List-Subscribe: , List-Archive: List-Unsubscribe: , Errors-To: emacs-devel-bounces+emacs-devel=quimby.gnus.org@gnu.org Xref: main.gmane.org gmane.emacs.devel:12857 X-Report-Spam: http://spam.gmane.org/gmane.emacs.devel:12857 In article , Richard Stallman writes: > Richard suggested `sequential-list' which, I think, is also > a good name. > Thinking about it again, I think number-sequence might be a better name. I've just installed it in subr.el. I implemented it as below. (defun number-sequence (from &optional to) "Return a sequence of numbers from FROM to TO (both inclusive) as a list. The Nth element of the list is (+ FROM N) where N counts from zero. If TO is nil, it defaults to FROM. If TO is less than FROM, the value is nil." (if to (if (< to from) (setq to (1- from))) (setq to from)) (let* ((list (make-list (- (1+ to) from) from)) (tail list)) (while (setq tail (cdr tail)) (setcar tail (setq from (1+ from)))) list)) If you think there's a better implementation, please improve the code. As for the spec of the function, I still have these questions. In Emacs, the word "number" includes a floating number. Should we make number-sequence work also for floating numbers? Ex. (number-sequence 1.5 4.4) => (1.5 2.5 3.5) or Ex. (number-sequence 1.5 4.4) => (2 3 4) Is it better to have the optional arg INC which specifies how much to increment numbers. --- Ken'ichi HANDA handa@m17n.org