ggplot2 geom_line() should point at specified value

Question

I have written the following code:

library(ggplot2)

data <- structure(list(x = c(1L, 6L, 3L, 4L, 2L, 3L, 6L, 1L, 5L, 2L, 
                    1L, 5L), y = c(         


        

Answer 1

geom_path should do the trick:

p <- ggplot(data, aes(x=x, y=y)) +
    geom_point(aes(colour=year), shape=16, size=6) +
    geom_path(aes(group=matching), 
                  arrow=arrow(length=unit(0.15,"cm")),
                  colour="black", size=1) +
    xlab("x") + ylab("y") +
    scale_colour_manual("year", values=colors) +
    scale_x_continuous(limits=c(1,7), breaks=seq(1,7, by=1)) +
    scale_y_continuous(limits=c(1,7), breaks=seq(1,7, by=1))

print(p)