February 2016
Intermediate to advanced
232 pages
4h 39m
Japanese
Content preview from Rパッケージ開発入門 ―テスト、文書化、コード共有の手法を学ぶ
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103
使うために特別な対応をする必要はありません。ジェネリックをインポートすれば、すべてのメ
ソッドが利用できます。
8.6.3
S4
別のパッケージで定義されているクラスを使うには、インポートしたクラスを継承するク
ラスの付近、あるいはインポートしたクラスのジェネリックを実装するメソッドの付近に
@
importClassesFrom package ClassA ClassB ...
のように定義します。
別のパッケージで定義されたジェネリックを使うには、インポートしたジェネリックを使用する
メソッドの付近に
@importMethodsFrom package GenericA GenericB ...
のように定義します。
S4
は
methods
パッケージに実装されているので、このパッケージが利用できるかどうか確認す
る必要があります。
R
を対話的に実行する場合は、
methods
パッケージは常に検索パスに存在し、
利用可能な状態になっているため、この作業は見落としがちです。しかし、
Rscript
では自動的に
ロードされてはいません。
Rscript
は、
R
をコマンドラインから実行する際によく使われるツール
です。確認する方法は、利用している
R
のバージョンによって方法が
2
つあります。
• R
のバージョンが
3.2.0
未満の場合：
DESCRIPTION
ファイルに
Depends: methods
を記載
する
• R
のバージョンが
3.2.0
以降の場合：
DESCRIPTION
ファイルに
Imports: ...
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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.