October 2017
Intermediate to advanced
480 pages
9h 49m
Japanese
Content preview from Rではじめるデータサイエンス
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6.3
パスとディレクトリ
99
getwd()
を実行すると作業ディレクトリの位置が表示されます。
getwd()
#> [1] "/Users/hadley/Documents/r4ds/r4ds"}
R ユーザの初心者なら、ホームディレクトリ、ドキュメントディレクトリ、その他のディレクトリ
をRの作業ディレクトリにしていても良いのですが、現在、この章を読んでいるなら、もう初心者
ではありません。分析プロジェクトをディレクトリで管理すべき時期が来ていますし、プロジェクト
の作業をするなら、Rの作業ディレクトリをプロジェクトにふさわしいディレクトリに設定すべきで
しょう。
私は推奨しませんが、Rの中から作業ディレクトリを設定することもできます。
setwd("/path/to/my/CoolProject")
これは決して行うべきではありません。より良い方法、エキスパートらしくRを管理するパス指定
の方法があります。
6.3
パスとディレクトリ
パスとディレクトリは、パス形式にMac/LinuxとWindowsという2 つの基本スタイルがあるため
に少々面倒です。相違点で大きいのは次の3つです。
●
最も重要な相違点はパス要素をどう分けるかだ。Mac/Linuxはスラッシュ（例plots/diamonds.
pdf）、Windowsはバックスラッシュ（例
plots\diamonds.pdf)
を使う。Rは（どのプラットフォー
ムを使っていても）どちらも扱えるが、残念ながらバックスラッシュがR で特別な意味を持つの ...
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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.