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
12.3
色覚異常に配慮したパレットを使う
287
ピ12.5 離散値変数に手動で定義したパレットを使う」を参照してください。
レシピ
12.3
色覚異常に配慮したパレットを使う
問題
色覚異常のある人にも見やすい色を使いたい。
解決策
viridis
パッケージ中のカラースケールを使います。
viridis
パッケージには、多くのカラースケールが用意されています。それらは、可能な限りパレット
を拡張して、データの違いを見やすくするために設計されたものです。知覚的に均一なものや、グレー
スケールで印刷可能なもの、色覚異常のある人にも読みやすくしたものなども含まれています。
次の図は
viridis
の紹介ページ（
https://cran.r-project.org/web/packages/viridis/vignettes/intro-to-
viridis.html
）に記載されている例です。
図12-4 viridisカラーパレットの例
viridis
のカラースケールは、連続値データでも離散値データでも使うことができます。連続値データ
の場合は、
scale_fill_viridis_c()
をプロットに追加する必要があります。離散値データの場合は、
scale_fill_viridis_d()
を使う必要があります（図12-5）。
library(gcookbook) # uspopage
データセットを使うために
gcookbook
を読み込む
#
基本プロットを作成
uspopage_plot <- ggplot(uspopage, ...
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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.