From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Stefan Monnier Newsgroups: gmane.emacs.devel Subject: Re: master 792ba71: Add a new function 'buffer-line-statistics' Date: Tue, 12 Jan 2021 13:15:25 -0500 Message-ID: References: <20210112174748.18372.29339@vcs0.savannah.gnu.org> <20210112174750.5928220B2C@vcs0.savannah.gnu.org> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="20665"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) Cc: Lars Ingebrigtsen To: emacs-devel@gnu.org Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Tue Jan 12 19:23:34 2021 Return-path: Envelope-to: ged-emacs-devel@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 1kzOKL-0005FP-Ud for ged-emacs-devel@m.gmane-mx.org; Tue, 12 Jan 2021 19:23:33 +0100 Original-Received: from localhost ([::1]:46590 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kzOKK-00041o-VK for ged-emacs-devel@m.gmane-mx.org; Tue, 12 Jan 2021 13:23:32 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:50662) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kzOCa-0001fT-8W for emacs-devel@gnu.org; Tue, 12 Jan 2021 13:15:32 -0500 Original-Received: from mailscanner.iro.umontreal.ca ([132.204.25.50]:2782) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kzOCX-0000Fh-Py for emacs-devel@gnu.org; Tue, 12 Jan 2021 13:15:31 -0500 Original-Received: from pmg3.iro.umontreal.ca (localhost [127.0.0.1]) by pmg3.iro.umontreal.ca (Proxmox) with ESMTP id EF02B440CF8; Tue, 12 Jan 2021 13:15:27 -0500 (EST) Original-Received: from mail01.iro.umontreal.ca (unknown [172.31.2.1]) by pmg3.iro.umontreal.ca (Proxmox) with ESMTP id CE7DA440CCD; Tue, 12 Jan 2021 13:15:26 -0500 (EST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=iro.umontreal.ca; s=mail; t=1610475326; bh=JW2BY4B31NnMpfNek7OEEhl0AquXYOK/kQVngYExkDE=; h=From:To:Cc:Subject:References:Date:In-Reply-To:From; b=eGNQc3MTw+tw9aQ4Ni5leqlustY8B2baWygA0JhA6//Rt4OoPcH7DPzG1NwIVG3Uv dhAzVnsM/b9gpuYHVfTlT2UHA83NIDkcXBJZzLEWWfCEK39NP2pI6iKhz20MLu20uJ C12B1DB8gscqAfFgWaTg+ClH5Sct9Pju+SunQLpZeqIBnTjnVrbsB7luwbgFiM0lPD A9TJVgykxGcZpS0Mzmz1P75yYNAKGA5UojxvGczZ3cDuZ5+5hH+45bCpZzBA2P/MoE qT4kVBpSzO/UgqG+vP0jvgpFOBn6OuAQzibOwgAWjn7ugCbLZsOQG+Rk1VUgohyHst mhBJIOi4Oh8Tw== Original-Received: from alfajor (unknown [45.72.224.181]) by mail01.iro.umontreal.ca (Postfix) with ESMTPSA id A386A1201F1; Tue, 12 Jan 2021 13:15:26 -0500 (EST) In-Reply-To: <20210112174750.5928220B2C@vcs0.savannah.gnu.org> (Lars Ingebrigtsen's message of "Tue, 12 Jan 2021 12:47:49 -0500 (EST)") Received-SPF: pass client-ip=132.204.25.50; envelope-from=monnier@iro.umontreal.ca; helo=mailscanner.iro.umontreal.ca X-Spam_score_int: -42 X-Spam_score: -4.3 X-Spam_bar: ---- X-Spam_report: (-4.3 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.io gmane.emacs.devel:263014 Archived-At: > + double mean = 0; [...] > + /* Blame Knuth. */ > + mean = mean + (this_line - mean) / lines; I must admit to not being fully cognizant of Knuth, but doesn't this compute the average rather than the mean? I thought computing the mean was necessarily O(N) in space (like keeping the full sequence of line lengths so you can sort it and then pick the middle point). Stefan