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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196
8
章 軸
図8-5 yの範囲に0を含むように拡張した箱ひげ図
レシピ
8.3
連続値軸を逆転させる
問題
連続値軸の方向を逆転させたい。
解決策
scale_y_reverse()
か
scale_x_reverse()
を使います（図8-6）。範囲を指定する順番を逆転させて
（上限値を
1
つ目、下限値を
2
つ目に指定して）、軸の方向を逆転させることもできます。
ggplot(PlantGrowth, aes(x = group, y = weight)) +
geom_boxplot() +
scale_y_reverse()
#
範囲を逆順に指定して、同じ効果を得る
ggplot(PlantGrowth, aes(x = group, y = weight)) +
geom_boxplot() +
ylim(6.5, 3.5)
レシピ
8.3
連続値軸を逆転させる
197
図8-6 y軸を逆転させた箱ひげ図
解説
scale_y_continuous()
と同様に、
scale_y_reverse()
は
ylim()
と一緒には使えません（
x
軸につい
ても同じです）。軸を逆転させて、同時に軸の範囲も設定したい場合は、
scale_y_reverse()
を使って
上限値と下限値を逆順で設定します。
ggplot(PlantGrowth, ...
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