From ruby-math-admin@netlab.co.jp  Wed Jun 14 04:21:12 2000
Received: from voscc.nagaokaut.ac.jp (voscc.nagaokaut.ac.jp [133.44.1.100])
	by blade.nagaokaut.ac.jp (8.8.8/8.8.8/Debian/GNU) with ESMTP id EAA09699;
	Wed, 14 Jun 2000 04:21:12 +0900
Received: from hoyogw.netlab.co.jp (postfix@hoyogw.netlab.co.jp [210.251.121.20])
	by voscc.nagaokaut.ac.jp (8.9.3/3.7W) id EAA05976;
	Wed, 14 Jun 2000 04:17:06 +0900 (JST)
Received: from hoyogw.netlab.co.jp (localhost [127.0.0.1])
	by hoyogw.netlab.co.jp (Postfix) with ESMTP
	id 6303C46CBE; Wed, 14 Jun 2000 04:17:05 +0900 (JST)
Delivered-To: ruby-math@netlab.co.jp
Date: Wed, 14 Jun 2000 04:17:02 +0900 (JST)
From: gotoken@math.sci.hokudai.ac.jp (GOTO Kentaro)
Reply-To: ruby-math@netlab.co.jp
Subject: [ruby-math:00331] Re: Float#ceil, Float#floor, Float#round
Sender: gotoken@hanare00.math.sci.hokudai.ac.jp
To: ruby-math@netlab.co.jp
Message-Id: <200006131917.EAA18065@hanare00.math.sci.hokudai.ac.jp>
In-Reply-To: "Shigeo Kobayashi"'s message of "Wed, 14 Jun 2000 01:15:14 +0900"
	<008501bfd552$8f34a5d0$0201a8c0@tinyforest.gr.jp>
References: <20000613145701.6F8E246CB9@hoyogw.netlab.co.jp>
	<008501bfd552$8f34a5d0$0201a8c0@tinyforest.gr.jp>
X-ML-Name: ruby-math
X-Mail-Count: 00331
X-MLServer: fml [fml 3.0pl#17]; post only (only members can post)
X-ML-Info: If you have a question, send e-mail with the body
	"help" (without quotes) to the address ruby-math-ctl@netlab.co.jp;
	help=<mailto:ruby-math-ctl@netlab.co.jp?body=help>
X-Mailer: cmail 2.59.12 on GNU Emacs 19.34.5 / Mule 2.3 (SUETSUMUHANA)
Mime-Version: 1.0 (generated by tm-edit 7.106)
Content-Type: text/plain; charset=ISO-2022-JP
Precedence: bulk
Lines: 12

In message "[ruby-math:00325] Re: Float#ceil, Float#floor, Float#round"
    on 00/06/14, "Shigeo Kobayashi" <shigeo@tinyforest.gr.jp> writes:
>それと、[ruby-math:00302] の「整数を返すという伝統」という
>のがちょっと気になります（伝統というのが何なのかはわかり
>ませんが、私は「互換性」をとりたい気がします。）。

それと，そもそもの伝統と言うのは，数学の，ということでした．
ceilとfloorは(たしか)APLの作者が考えたモノですが， ceil(x)
(floor(x)) はxを下回らない(超えない)最小の(最大の)整数ですね．

-- gotoken(←最初に考えてたことをすっかり忘れてるひと)