runifdisc: Generate N Uniform Random Points in a Disc
Description
Generate a random point pattern
containing $n$ independent uniform random points
in a circular disc.
Usage
runifdisc(n, radius=1, centre=c(0,0), ...)
Arguments
n
Number of points.
radius
Radius of the circle.
centre
Coordinates of the centre of the circle.
...
Arguments passed to disc controlling the
accuracy of approximation to the circle.
Value
The simulated point pattern (an object of class "ppp").
Details
This function generates n independent random points,
uniformly distributed in a circular disc.
It is faster (for a circular window) than the general
code used in runifpoint.
To generate random points in an ellipse, first generate points in a
circle using runifdisc,
then transform to an ellipse using affine,
as shown in the examples.
To generate random points in other windows, use
runifpoint.
To generate non-uniform random points, use rpoint.
# 100 random points in the unit disc plot(runifdisc(100))
# 42 random points in the ellipse with major axis 3 and minor axis 1 X <- runifdisc(42)
Y <- affine(X, mat=diag(c(3,1)))
plot(Y)