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)