RMcircular: Circular Covariance Model
In RandomFields: Simulation and Analysis of Random Fields

Description Usage Arguments Details Value References See Also Examples

RMcircular is a stationary isotropic covariance model which is only valid for dimensions d ≤ 2 . The corresponding covariance function only depends on the distance r ≥ 0 between two points and is given by

C(r) = 1 - 2/π (r √(1-r^2) + asin(r)) 1_{[0,1]}(r).

1	RMcircular(var, scale, Aniso, proj)

var,scale,Aniso,proj

optional arguments; same meaning for any RMmodel. If not passed, the above covariance function remains unmodified.

The model is only valid for dimensions d ≤ 2. It is a covariance function with compact support (cf. Chiles, J.-P. and Delfiner, P. (1999), p. 82).

RMcircular returns an object of class RMmodel.

Chiles, J.-P. and Delfiner, P. (1999) Geostatistics. Modeling Spatial Uncertainty. New York: Wiley.

RMmodel, RFsimulate, RFfit.

RFoptions(seed=0) ## *ANY* simulation will have the random seed 0; set
##                   RFoptions(seed=NA) to make them all random again

model <- RMcircular()
x <- seq(0, 10, 0.02)
plot(model)
plot(RFsimulate(model, x=x))