Vertical lines between points with ggplot2

Question

I am new to ggplot2 and cannot figure out how to draw vertical dotted grey lines between

the points/dots along the x-axis. Here\'s my example code:

Answer 1

You should be using geom_vline() to do this.

        d1 <- runif(10,10,15)
        d2 <- runif(10,25,30)
        d3 <- rep(1:10,2)
        df <- data.frame(x = d3, y = c(d1,d2))
       ggplot(df, aes(x=x, y=y)) + geom_point() + 
geom_vline(xintercept = df$x, linetype= 3, colour = "#919191")