June 2020
Beginner to intermediate
522 pages
9h 6m
Chinese
Content preview from R 语言经典实例（原书第 2 版）
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图 10-43：按货架编号分别绘制的箱线图
请注意，在 aes 调用中，我们必须告诉 ggplot 将货架编号视为一个因子。
否则，ggplot 不会将货架视作一个分组变量并做出反应，并且将只打印一
个箱线图。
10.18.4 另请参阅
有关创建一个基本箱线图的信息，请参阅 10.17 节。
10.19 创建直方图
10.19.1 问题
需要创建数据的直方图。
10.19.2 解决方案
使用 geom_histogram，并将 x 设置为数值向量。
10.19.3 讨论
图 10-44 是数据集 Cars93 的 MPG.city 列的直方图：
data(Cars93, package = "MASS")
ggplot(Cars93) +
geom_histogram(aes(x = MPG.city))
#> `stat_bin()` using `bins = 30`. Pick better value with `binwidth`.
图形
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MPG.city
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图 10-44：按 MPG 计数的直方图
geom_histogram ...
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