Hi,
You could add arrows with geom_segment; however if you want even
spacing along the path it might get tricky,
library(ggplot2)
d <- data.frame(x=seq(0, 10, length=100),
y=sin(seq(0, 10, length=100)))
N <- 10
dN <- 2
ind <- seq(1,nrow(d),by=N)
ind <- ind[-c(1,length(ind))]
d3 <- data.frame(xstart = d$x[ind],
xend = d$x[ind+2],
ystart = d$y[ind],
yend = d$y[ind+2])
ggplot(d)+
geom_path(aes(x,y)) +
geom_segment(data=d3, aes(xstart,ystart,xend=xend,yend=yend), arrow=arrow())
HTH,
baptiste
On 23 February 2011 02:00, Malcolm Ryan <malco...@cse.unsw.edu.au> wrote:
> I'm doing a path plot with ggplot2, the result is looking very nice, but I
> want to give some indication of which direction the lines are going. I
> thought of using colour gradients, but it doesn't look right. What would be
> ideal is a line type that indicated direction, something like ">>>>>>>". Is
> there any way to achieve this? Or can anyone suggest another way of
> representing this information?
>
> Malcolm
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