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
5.3
点の形を指定する
87
geom_point() +
scale_shape_manual(values = c(1,2)) +
scale_colour_brewer(palette = "Set1")
図5-4 左：色と形の両方にマッピング 右：色と形を手動で指定
関連項目
その他の形を使う場合は、「レシピ5.3 点の形を指定する」
.
を参照してください。
色の使い方のより詳細な内容は、「12章 色を使う」を参照してください。
レシピ
5.3
点の形を指定する
問題
点の形をデフォルトと違う形に指定したい。
解決策
すべての点の形を一括で指定したい場合は、
geom_point()
で
shape
を指定します（図5-5 左）。
library(gcookbook) # heightweight
データセットを使うために
gcookbook
を読み込む
ggplot(heightweight, aes(x = ageYear, y = heightIn)) +
geom_point(shape = 3)
既に
shape
に変数をマッピングしている場合は、
scale_shape_manual()
を使って形を変更します。
#
少しだけ点を大きくし、
2
つのグループの
shape
に独自の値を指定する
ggplot(heightweight, aes(x = ageYear, y = heightIn, shape = sex)) +
geom_point(size = 3) +
88
5
章 散布図
scale_shape_manual(values ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.