# rags

##### Alternating Gibbs Sampler for Multitype Point Processes

Simulate a realisation of a point process model using the alternating Gibbs sampler.

##### Usage

`rags(model, …, ncycles = 100)`

##### Arguments

- model
Data specifying some kind of point process model.

- …
Additional arguments passed to other code.

- ncycles
Number of cycles of the alternating Gibbs sampler that should be performed.

##### Details

The Alternating Gibbs Sampler for a multitype point process
is an iterative simulation procedure. Each step of the sampler
updates the pattern of points of a particular type `i`

,
by drawing a realisation from the conditional distribution of
points of type `i`

given the points of all other types.
Successive steps of the sampler update the points of type 1, then
type 2, type 3, and so on.

This is an experimental implementation which currently works only
for multitype hard core processes (see `MultiHard`

)
in which there is no interaction between points of the same type.

The argument `model`

should be an object describing a point
process model. At the moment, the only permitted format for
`model`

is of the form `list(beta, hradii)`

where
`beta`

gives the first order trend and `hradii`

is the
matrix of interaction radii. See `ragsMultiHard`

for
full details.

##### Value

A point pattern (object of class `"ppp"`

).

##### See Also

##### Examples

```
# NOT RUN {
mo <- list(beta=c(30, 20),
hradii = 0.05 * matrix(c(0,1,1,0), 2, 2))
rags(mo, ncycles=10)
# }
```

*Documentation reproduced from package spatstat, version 1.55-1, License: GPL (>= 2)*