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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178
7
章 注釈
図7-9 離散値に線を描画
線の追加の方法が他の注釈の追加の方法と違うことに気が付いたかもしれません。線の追
加の場合、
annotate()
関数を使わず、
geom_hline()
とその関連関数を使いました。これは
以前のバージョンの
ggplot2
には
annotate()
関数がなかったためです。元々、線
geom
は
1
本の線を追加する場合だけを扱うコードであったため、これを変更すると
ggplot2
の後方互
換性がくずれる問題がありました。
関連項目
回帰直線を追加するためには、「レシピ5.6 回帰モデルの直線をフィットさせる」と「レシピ5.7 既
存のモデルをフィットさせる」を参照してください。
線は、データ情報の要約を表示するためによく使われます。データをグループごとに要約する方法
については、「レシピ15.17 グループごとにデータを要約する」を参照してください。
レシピ
7.4
線分と矢印を追加する
問題
図に線分と矢印を追加したい。
解決策
annotate("segment")
関数を使います。次の例では、
climate
データセットから、データソース
Berkeley
から一部のデ
ータを取り出して使います（図7-10）。
library(gcookbook) # climate
データセットを使うために
gcookbook
を読み込む
p <- ggplot(filter(climate, Source == "Berkeley"),
レシピ
7.4
線分と矢印を追加する
179
aes(x = Year, ...
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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.