ggplot，在各个方面之间绘制线

Question

使用ggplot2，我如何绘制在facet之间运行的趋势线。

library(ggplot2)
df <- data.frame(y=c(1,2,3),x=1,Set=LETTERS[1:3])
ggplot(df,aes(x,y)) + 
  theme_bw() + theme(legend.position=c(0,1),legend.justification=c(0,1)) + 
  geom_point(aes(fill=Set),color="black",shape=21,size=3) + 
  facet_grid(~Set) + 
  xlim(1,5)

产生以下内容：

在上面，我想在这三点之间画一条线，横过小平面。

Answer 1

已更新为ggplot2 V3.0.0

你可以这样做，但是关闭剪辑可能会产生不良后果，

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