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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354
13
章 さまざまなグラフ
map_id
エステティック属性にマッピングします。例えば、次のコードは最初の例（図13-35）と同じ地
図を出力します。
# crimes
データの
'state'
列は
states_map
データの
'region'
列に一致する。
ggplot(crimes, aes(map_id = state, fill = Assault)) +
geom_map(map = states_map) +
expand_limits(x = states_map$long, y = states_map$lat) +
coord_map("polyconic")
また、
expand_limits()
も使用する必要があることに注意してください。これは
geom_map()
が、多
くの幾何オブジェクトと違って
x
と
y
の範囲の値を自動で設定しないためです。
expand_limits()
は指
定した
x
と
y
を含む範囲を設定します（
ylim()
と
xlim()
を使用して指定することもできます）。
関連項目
地図の上に他のデータを重ね書きする例は、「レシピ13.12 ベクトルフィールドを作成する」を参照
してください。
連続値のカラーパレットについての詳細は、「レシピ12.6 連続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
13.19
地図の背景を消す
問題
地図から背景を取り除きたい。
解決策
theme_void()
を使用します（図 13-38）この例では、「レシピ13.18 コロプレ
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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.