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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191
8
章
軸
x
軸と
y
軸は、表示されたデータを解釈するための情報を提供します。
ggplot
は、ほとんどの場合デ
フォルトで適切な軸を表示します。しかし、例えば、軸ラベル、目盛の数や位置、目盛ラベルなどを自
分で制御したいこともあるでしょう。この章では、軸の体裁をきれいに調整する方法をまとめます。
レシピ
8.1
x
軸と
y
軸を反転する
問題
グラフの
x
軸と
y
軸を反転したい。
解決策
coord_flip()
を使って、軸を反転させます（図8-1）。
ggplot(PlantGrowth, aes(x = group, y = weight)) +
geom_boxplot()
ggplot(PlantGrowth, aes(x = group, y = weight)) +
geom_boxplot() +
coord_flip()
192
8
章 軸
図8-1 左：標準の軸で表示した箱ひげ図 右：軸を反転させて表示した箱ひげ図
解説
散布図では、垂直軸と水平軸の情報を反転するのは簡単なことです。単純に
x
と
y
にマッピングされ
た変数を交換すれば良いのです。しかし、
ggplot
のすべての幾何オブジェクトが
x
軸と
y
軸を同等に扱
うわけではありません。例えば、箱ひげ図はデータを
y
軸に関して要約します。折れ線グラフの線は
x
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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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.