xneig4 {bayess} R Documentation

## Number of neighbours with the same colour

### Description

This is a basis function used in simulation algorithms on the Ising and Potts models. It counts how many of the four neighbours of x_{a,b} are of the same colour as this pixel.

### Usage

xneig4(x, a, b, col)


### Arguments

 x grid of coloured pixels a row index b column index col current or proposed colour

### Value

integer between 0 and 4 giving the number of neighbours with the same colour

pottsgibbs, sumising
data(Laichedata)