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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40
3
章 棒グラフ
2
つのグラフの棒の間隔（
position_dodge()
の
width
）は同じ
0.9
ですが、上のグラフは棒の幅（
geom_
col()
の
width
）も
0.9
であるのに対して、下のグラフは棒の幅は
0.2
です。棒の幅は違っても、棒の中
心位置は揃っています。
図3-15 棒の間隔は同じ0.9だが、棒の幅は0.9（上）と0.2（下）で異なる
グラフ全体の幅を調整する場合は、棒の寸法はグラフ全体の幅に合わせて変わります。グラフが表
示されるウィンドウをリサイズすれば、どのようにサイズが調整されるかがわかるでしょう。ファイル
への出力時にグラフの幅を調整する方法については、「14章 文書用に図を出力する」を参照してくだ
さい。
レシピ
3.7
積み上げ棒グラフを作成する
問題
積み上げ棒グラフを作成したい。
解決策
geom_col()
を使い、
fill
に変数をマッピングします。これにより、
Date
を
x
軸に取り、
Cultivar
を
塗りつぶし色に使うグラフが描画されます（図3-16）。
library(gcookbook) # cabbage_exp
データセットを使うために
gcookbook
を読み込む
ggplot(cabbage_exp, aes(x = Date, y = Weight, fill = Cultivar)) +
geom_col()
レシピ
3.7
積み上げ棒グラフを作成する
41
図3-16 積み上げ棒グラフ
解説
グラフがどのように作られるかを理解するには、データの構造を知ることが役に立ち ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.