R: how do I draw a line with multiple arrows in it?

Question

I was wondering if anyone could help me plot lines in R with multiple arrows in them, like this:

--->--->--->--->

Thanks in advance!

Answer 1

Simulair to DWin this is what I came up with:

arrowLine <- function(x0,y0,x1,y1,nArrow=1,...)
{
  lines(c(x0,x1),c(y0,y1),...)
  Ax=seq(x0,x1,length=nArrow+1)
    Ay=seq(y0,y1,length=nArrow+1)
  for (i in 1:nArrow)
  {
    arrows(Ax[i],Ay[i],Ax[i+1],Ay[i+1],...)
  }
}

Basically it overlaps several arrows in a line, but does get the desired result (I assume straigth lines):

plot(0:1,0:1)
arrowLine(0,0,1,1,4)

The real tricky part comes to getting the arrow to got o the edge of points instead of the center. Is that needed?