Adding truncated line to ggplot-CodePudding

I am trying to plot decision boundaries of a decision tree in ggplot. Unfortunately, when I run this code, I partition data_plot into four (rather than three regions). Note that below data is just a placeholder (doesn't make sense to partition this way).

data_plot <- data.frame(x=runif(100,0,1), y=runif(100,0,1))
cut1 <- 0.5
cut2 <- 0.5

ggplot(data_plot, aes(x=x, y=y))  
  geom_point()  
  geom_vline(xintercept = cut1)   
  geom_hline(yintercept = cut2)

Question: How can I restrict the second cut to one of the intervals induced by the first cut. That is, how can I truncate the second line to the interval [cut1, 1] ?

CodePudding user response：

If I understand you correctly, you could use geom_segment like this:

data_plot <- data.frame(x=runif(100,0,1), y=runif(100,0,1))
cut1 <- 0.5
cut2 <- 0.5

library(ggplot2)
ggplot(data_plot, aes(x=x, y=y))  
  geom_point()  
  geom_vline(xintercept = cut1)   
  geom_segment(x = cut2, xend = 1, y = cut2, yend = cut2, size = 0.2)

^{Created on 2022-07-09 by the reprex package (v2.0.1)}