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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レシピ
8.6
目盛の位置を設定する
201
図8-11 軸の比を1/2にした散布図
レシピ
8.6
目盛の位置を設定する
問題
軸上の目盛位置を設定したい。
解決策
通常、
ggplot
は、どこに目盛を表示するかを適切に決めてくれますが、これを変更したい場合には
breaks
をスケールに指定します（図 8-12）。
ggplot(PlantGrowth, aes(x = group, y = weight)) +
geom_boxplot()
ggplot(PlantGrowth, aes(x = group, y = weight)) +
geom_boxplot() +
scale_y_continuous(breaks = c(4, 4.25, 4.5, 5, 6, 8))
202
8
章 軸
図8-12 左：自動的に目盛が設定された箱ひげ図 右：手動で目盛を設定した箱ひげ図
解説
目盛記号の位置は、主目盛線をどこに描くかを定義します。軸が連続値の場合は、補助目盛線（目盛
ラベルは付かず、薄い線で描かれる目盛線）は、デフォルトでは主目盛線の半分の位置に描かれます。
目盛位置のベクトルを生成するために、
seq()
関数や
:
演算子を使うこともできます。
seq(4, 7, by = .5)
#> [1] 4.0 4.5 5 ...
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