pg_plot <- ggplot(PlantGrowth, aes(x = group, y = weight)) +
geom_boxplot()
pg_plot +
xlab(NULL)
解説
軸ラベルが冗長であったり、文脈から明らかであったりする場合など、軸ラベルを表示する必要が
ないときがあります。この例では、
x
軸は
group
を示していますが、これは文脈から明らかです。同様
に
y
軸の目盛ラベルがkgなどの単位になっていれば、軸ラベルの「
weight
(体重)」は不要かもしれませ
ん。
軸ラベルに空文字を設定することで、軸ラベルを非表示
にすることもできます。しかし、この方法で
は、図8-21の右のように、表示されるグラフには軸ラベルテキストを表示するための領域が確保され
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