November 2019
Intermediate to advanced
472 pages
9h 23m
Japanese
Content preview from Rグラフィックスクックブック 第2版 ―ggplot2によるグラフ作成のレシピ集
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169
7
章
注釈
図を作成する際に、大抵の場合データをただ表示するだけでは不十分です。いろいろな情報を追加
することで、見る人のデータの解釈を助けることができます。軸ラベル、目盛、凡例などの標準的なレ
パートリーに加えて、個別に図形やテキストの要素を図に追加できます。これらの注釈を用いることに
より、情報を追加したり、図の一部分を強調したり、データについての説明文を加えたりすることがで
きます。
レシピ
7.1
テキスト注釈を追加する
問題
図にテキスト注釈を追加したい。
解決策
annotate()
関数とテキスト
geom
を使用します（図 7-1）。
p <- ggplot(faithful, aes(x = eruptions, y = waiting)) +
geom_point()
p +
annotate("text", x = 3, y = 48, label = "Group 1") +
annotate("t
ext", x = 4.5, y = 66, label = "Group 2")
170
7
章 注釈
図7-1 テキスト注釈
解説
annotate()
関数を使って、あらゆるタイプの幾何オブジェクトを追加することができます。この例
の場合、
geom = "text"
を使用しています。
その他のテ
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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.