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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216
8
章 軸
図8-25 左：太い軸線を使用し、端が完全に重ならない場合
右：lineend = "square"を指定して完全に重ねた場合
関連項目
テーマシステムがどのように機能するかについての詳細は、「レシピ9.3 テーマを使う」を参照して
ください。
レシピ
8.14
対数軸を使用する
問題
グラフに対数軸を使用したい。
解決策
scale_x_log10()
や
scale_y_log10()
を使います（図8-26）。
library(MASS) # Animals
データセットを使うために
MASS
を読み込む
#
基本プロットを作成
animals_plot <- ggplot(Animals, aes(x = body, y = brain,
label = rownames(Animals))) +
geom_text(size = 3)
animals_plot
# x
軸と
y
軸を対数軸にする
animals_plot +
scale_x_log10() +
scale_y_log10()
レシピ
8.14
対数軸を使用する
217
図8-26 左：指数関数的に分布するデータを線形軸で表示したもの 右：対数軸で表示したもの
解説
対数軸のグラフでは、見た目の距離は一定の割合の変化を示します。例えば、
y
軸上で
1
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