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
｜
269
来探索帮助文档中的选项说明。
如果我们想要绘制一条存储在另一个 R 对象中的直线，我们可以使用 geom_abline 在
图形上绘制。在下面的例子中，我们从回归模型 m 中获取截距项和斜率，并将它们添加
到我们的图中（见图 10-23 ）。
m <- lm(crossx ~ energy, data = strongx)
ggplot(strongx, aes(energy, crossx)) +
geom_point() +
geom_abline(
intercept = m$coefficients[1],
slope = m$coefficients[2]
)
crossx
energy
350
300
250
200
0.1 0.2 0.3
图 10-23：根据斜率和截距绘制的简单直线
这产生了与图 10-22 非常相似的图。如果想从简单线性模型以外的来源绘制直线，那么
使用 geom_abline 可以很方便地完成这一任务。
10.7.4 另请参阅
有关线性回归和 lm 函数的更多信息，请参见第 11 章。
10.8 多变量散点图的绘制
10.8.1 问题
数据集包含多个数值型变量。你想得到所有变量对的散点图。
270
｜
第
10
章
10.8.2 解决方案
ggplot 没有任何内置方法来创建成对图形 ...
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