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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253
10
章
凡例
x
軸、
y
軸と同じように凡例はガイドです。視覚的（エステティック）属性とデータの関係を凡例は
示します。
レシピ
10.1
凡例を非表示にする
問題
グラフの凡例を非表示にしたい。
解決策
guides()
を使い、凡例を非表示にするスケールを指定します（図10-1）。
#
基本プロットを作成（凡例付き）
pg_plot <- ggplot(PlantGrowth, aes(x = group, y = weight, fill = group)) +
geom_boxplot()
pg_plot
# fill
の凡例を非表示にする
pg_plot +
guides(fill = FALSE)
254
10
章 凡例
図10-1 左：デフォルトの体裁 右：凡例なし
解説
スケールで
guide = FALSE
を指定しても凡例を非表示にできます。この場合も前述のコードとまっ
たく同じ出力が得られます。
# fill
の凡例を非表示にする
pg_plot +
scale_fill_discrete(guide = FALSE)
凡例を非表示にする別の方法としてテーマシステムを使うこともできます。複数のエステティック
マッピング（例えば
color
と
shape
）を使っている場合には、この方法ですべての凡例を非表示にで
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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.