runifdisc
Generate N Uniform Random Points in a Disc
Generate a random point pattern containing \(n\) independent uniform random points in a circular disc.
Usage
runifdisc(n, radius=1, centre=c(0,0), ..., nsim=1, drop=TRUE)Arguments
- n
Number of points.
- radius
Radius of the circle.
- centre
Coordinates of the centre of the circle.
- …
Arguments passed to
disccontrolling the accuracy of approximation to the circle.- nsim
Number of simulated realisations to be generated.
- drop
Logical. If
nsim=1anddrop=TRUE(the default), the result will be a point pattern, rather than a list containing a point pattern.
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.
Value
A point pattern (an object of class "ppp")
if nsim=1, or a list of point patterns if nsim > 1.
See Also
Examples
# NOT RUN {
# 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)
# }