| 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), ...)
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.
|
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.
The simulated point pattern (an object of class "ppp").
Adrian Baddeley adrian@maths.uwa.edu.au http://www.maths.uwa.edu.au/~adrian/ and Rolf Turner rolf@math.unb.ca http://www.math.unb.ca/~rolf
# 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)