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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38
ます。さきほど示した簡単な例には、この書式のほとんどの構造を確認することができます。各行
は、コロンで区切られたー名と値で構成されます。値が複数行にまたがる場合は、インデ
ントする必要があります。
Description:
2
4
この章では、
DESCRIPTION
ファイルの主要なフィールドの使い方を説明します。
4.1
パッケージ
パッケージを動作させるために必要なパッケージを一覧化するのは
DESCRIPTION
ファイルの役
割です。
R
には、潜在的な依存関係を記述するための方法がたくさんあります。例えば、次の行は
パッケージの動作に
ggvis
と
dplyr
が両方必要であることを示しています。
Imports:
dplyr,
ggvis
逆に、次の行はパッケージで
ggvis
と
dplyr
を活用することができるが、動作に必要ではないこ
とを示しています。
Suggests:
dplyr,
ggvis,
Imports
と
Suggests
は両方とも、パッケージ名をコンマで区切ったリスト形式で記載します。
私は、各行にパッケージを
1
つ置き、アルファベット順にするのを勧めます。これによって、さっ
と見るのが容易になります。
Imports
と
Suggests
は、依存関係の強さが異なります。
Imports
Imports ...
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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.
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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.