3.6 Geometric objects

ggplot(data = mpg) + geom_point(mapping = aes(x = displ, y = hwy))
ggplot(data = mpg) + geom_smooth(mapping = aes(x = displ, y = hwy))

点图 3.8.png 平滑的趋势图 3.9.png

ggplot(data = mpg) + geom_smooth(mapping = aes(x = displ, y = hwy, linetype = drv))

以drv分类，可以看出每种类别的趋势 3.10.png

将不同的图绘制在一个图上面