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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图形
｜
255
ggplot(mtcars, aes(hp, mpg)) +
geom_point() +
labs(title = "Cars: Horsepower vs. Fuel Economy",
x = "HP",
y = "Economy (miles per gallon)")
HP
200 300100
35
30
25
20
15
10
Cars: Horsepower vs. Fuel Economy
Economy (miles per gallon)
图 10-4：添加一个标题和多个标签
10.3 添加（或去除）网格
10.3.1 问题
需要更改图形的背景网格。
10.3.2 解决方案
使用 ggplot 时，背景网格的默认设置正如你在之前的阅读中看到的那样。但是，我们
可以使用 theme 函数或通过将预先打包的主题应用于图表来更改背景网格。
我们可以使用 theme 函数改变图形的背景面板。此示例将背景网格删除，如图 10-5
所示。
ggplot(df) +
geom_point(aes(x, y)) +
theme(panel.background = element_rect(fill = "white", color = "grey50"))
256
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