| arrows {graphics} | R Documentation |
Draw arrows between pairs of points.
arrows(x0, y0, x1, y1, length = 0.25, angle = 30, code = 2,
col = par("fg"), lty = NULL, lwd = par("lwd"), xpd = NULL)
x0, y0 |
coordinates of points from which to draw. |
x1, y1 |
coordinates of points to which to draw. |
length |
length of the edges of the arrow head (in inches). |
angle |
angle from the shaft of the arrow to the edge of the arrow head. |
code |
integer code, determining kind of arrows to be drawn. |
col, lty, lwd, xpd |
usual graphical parameters as in
par. |
For each i, an arrow is drawn between the point (x0[i],
y0[i]) and the point (x1[i],y1[i]).
If code=2 an arrowhead is drawn at (x0[i],y0[i]) and if
code=1 an arrowhead is drawn at (x1[i],y1[i]). If
code=3 a head is drawn at both ends of the arrow. Unless
length = 0, when no head is drawn.
The graphical parameters col and lty can be used
to specify a color and line texture for the line segments which
make up the arrows (col may be a vector).
The direction of a zero-length arrow is indeterminate, and hence so is the direction of the arrowheads. To allow for rounding error, arrowheads are omitted (with a warning) on any arrow of length less than 1/1000 inch.
Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language. Wadsworth & Brooks/Cole.
segments to draw segments.
x <- runif(12); y <- rnorm(12) i <- order(x,y); x <- x[i]; y <- y[i] plot(x,y, main="arrows(.) and segments(.)") ## draw arrows from point to point : s <- seq(length(x)-1)# one shorter than data arrows(x[s], y[s], x[s+1], y[s+1], col= 1:3) s <- s[-length(s)] segments(x[s], y[s], x[s+2], y[s+2], col= 'pink')