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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38
3
章 棒グラフ
レシピ
3.6
棒の幅と間隔を調整する
問題
棒の幅と、棒同士の間隔を調整したい。
解決策
棒の幅を狭くまたは広くするには、
geom_col()
に
width
を指定します。デフォルトの値は
0.9
で、こ
れより大きくすれば棒の幅は広く、小さくすれば棒の幅は狭くなります（図 3-13）。
例えば、標準の幅の棒グラフは次のように記述します。
library(gcookbook) # pg_mean
データセットを使うために
gcookbook
を読み込む
ggplot(pg_mean, aes(x = group, y = weight)) +
geom_col()
幅を狭くする場合、次のように記述します。
ggplot(pg_mean, aes(x = group, y = weight)) +
geom_col(width = 0.5)
幅を広くする場合、次のように記述します（最大の幅は
1
です）。
ggplot(pg_mean, aes(x = group, y = weight)) +
geom_col(width = 1)
図3-13 さまざまな幅の棒グラフ
グループ化された棒グラフの場合、デフォルトでは各グループの棒の間にはスペースはありません。
グループ内の棒の間にスペースを空けるには、
width
の値を小さくし、
position_dodge
の値を
width
よりも大きくします（図 3-14）。
以下は、グループ化されたグラフで棒を細くする場合の記述です。
ggplot(cabbage_exp, aes(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.
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.