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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266
10
章 凡例
レシピ
10.8
凡例内のラベルを変更する
問題
凡例内のテキストラベルを変更したい。
解決策
スケールを指定する際に
labels
で設定します（図 10-13左）。
library(gcookbook) # PlantGrowth
データセットを使うために
gcookbook
を読み込む
#
基本プロット
pg_plot <- ggplot(PlantGrowth, aes(x = group, y = weight, fill = group)) +
geom_boxplot()
#
凡例ラベルを変更
pg_plot +
scale_fill_discrete(labels = c("Control", "Treatment 1", "Treatment 2"))
解説
x
軸のラベルは変わっていないことに注意します。
x
軸のラベルを変えるには
scale_x_discrete()
で
labels
を設定する（「レシピ8.10 軸ラベルのテキストを変更する」）か、データのファクタレベル名
を変更する（「レシピ15.10 ファクタのレベル名を変更する」）必要があります。
前の例で
group
はエステティック属性
fill
にマッピングされていました。この場合、デフォルトで
は
scale_fill_discrete()
が使われ、色相環上で等間隔に配置された色にファクタレベルがマッピン
グされます（
scale_fill_hue()
と同じ）。他の塗りつぶし（
fill
）スケールでも同じようにラベルを変更
できます。
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