runifdisc {spatstat} | R Documentation |
Generate a random point pattern containing n independent uniform random points in a circular disc.
runifdisc(n, radius=1, centre=c(0,0), ..., nsim=1, drop=TRUE)
n |
Number of points. |
radius |
Radius of the circle. |
centre |
Coordinates of the centre of the circle. |
... |
Arguments passed to |
nsim |
Number of simulated realisations to be generated. |
drop |
Logical. If |
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
.
A point pattern (an object of class "ppp"
)
if nsim=1
, or a list of point patterns if nsim > 1
.
Adrian Baddeley Adrian.Baddeley@curtin.edu.au
and Rolf Turner r.turner@auckland.ac.nz
# 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)