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 10-35：折线图
10.14 改变线的类型、宽度或者颜色
10.14.1 问题
你正在绘制一条线，需要更改其类型、宽度或颜色。
10.14.2 解决方案
ggplot 使用 linetype 参数来控制线的外观。选项包括：
•
linetype = "solid" 或 linetype = 1（默认值）
•
linetype = "dashed" 或 linetype = 2
•
linetype = "dotted" 或 linetype = 3
•
linetype = "dotdash" 或 linetype = 4
•
linetype = "longdash" 或 linetype = 5
•
linetype = "twodash" 或 linetype = 6
•
linetype = "blank" 或 linetype = 0（抑制绘图）
我们可以通过将 linetype、col 和 size 作为参数传递给 geom_line 来更改线条
特征。例如，如果我们想将线型更改为虚线、红色和重线，我们可以将以下参数传递给
geom_line：
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ggplot(df, ...
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