January 2020
Intermediate to advanced
584 pages
7h 18m
Japanese
Content preview from Rクックブック 第2版
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
3章Rを操作する
RとRStudioは非常に巨大なソフトの塊です。必然的に、巨大なソフトにはつきものですが、設定やカスタマイズ、更新、自分の計算環境に合わせることに、非常に時間と労力がかかります。この章は、ユーザのこうした作業をサポートするものです。数値、統計学、グラフについての話題については触れません。本章は、RとRStudioのソフトウェアとして扱う観点から役に立つ情報を紹介します。
レシピ3.1 作業ディレクトリを取得し、設定する
問題
作業ディレクトリを変更したい。あるいは、作業ディレクトリがどこにあるかを知りたい。
解決策
- RStudio
- ファイルペインで作業ディレクトリに移動する。そして、図3-1に示すようにファイルペインから［More］の［Set as Working Directory］を選択する。
図3-1 RStudio：作業ディレクトリの設定
- コンソール
getwdを使って作業ディレクトリの場所を確認する。変更にはsetwdを使う。
getwd()## [1] "/Users/jal/DocumentsPersonal/R-Cookbook"setwd("~/Documents/MyDirectory")
解説
作業ディレクトリはすべての入出力ファイルのデフォルトとなる位置で、データファイルの読み込み／書き込み、スクリプトファイルのオープン／保存、ワークスペースイメージの保存などを行うため、重要です。絶対パスを指定しないでファイルを開く場合、Rはそのファイルは作業ディレクトリにあると考えます。 ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.