This function produces one simulation of a square numb by numb grid
from a Potts distribution with four colours and a four neighbour
structure, relying on niter iterations of a standard Gibbs sampler.
Usage
pottsgibbs(niter, numb, beta)
Arguments
niter
number of Gibbs iterations
numb
size of the square grid
beta
parameter of the Potts model
Value
returns a random realisation from the Potts model
References
Geman, S. and Geman, D. (1984)
Stochastic relaxation, Gibbs distributions and the Bayesian restoration of
images. IEEE Trans. Pattern Anal. Mach. Intell., 6, 721--741.