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Draw arrows between pairs of points.
arrows(x0, y0, x1 = x0, y1 = y0, length = 0.25, angle = 30,
code = 2, col = par("fg"), lty = par("lty"),
lwd = par("lwd"), …)
coordinates of points from which to draw.
coordinates of points to which to draw. At least one must the supplied
length of the edges of the arrow head (in inches).
angle from the shaft of the arrow to the edge of the arrow head.
integer code, determining kind of arrows to be drawn.
graphical parameters, possible vectors.
NA
values in col
cause the arrow to be omitted.
graphical parameters such as xpd
and the line
characteristics lend
, ljoin
and lmitre
:
see par
.
For each i
, an arrow is drawn between the point (x0[i],
y0[i])
and the point (x1[i], y1[i])
. The coordinate vectors
will be recycled to the length of the longest.
If code = 1
an arrowhead is drawn at (x0[i], y0[i])
and if
code = 2
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
, lty
and lwd
can be vectors of length greater than one and will be recycled if
necessary.
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.
# NOT RUN {
x <- stats::runif(12); y <- stats::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")
# }
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