Example Needed: Using arrow() with ggplot2

Question

I\'d like to create a geom_path() that has arrows pointing towards the next location in the path.

I can get the path to plot, without issue, for example:

Answer 1

geom_segment has an arrow argument. Here's a short example:

library(grid) # needed for arrow function

p <- ggplot(df, aes(x=x, y=y)) +
     geom_point() +
     geom_segment(aes(xend=c(tail(x, n=-1), NA), yend=c(tail(y, n=-1), NA)),
                  arrow=arrow(length=unit(0.3,"cm")))

library(grid) is needed for arrow() function, see here.