R: Extract Interaction Structure

as.interact {spatstat} | R Documentation

## Extract Interaction Structure

### Description

Extracts the interpoint interaction structure from a point pattern model.

### Usage

    as.interact(object)
    ## S3 method for class 'fii'
    as.interact(object)
    ## S3 method for class 'interact'
    as.interact(object)
    ## S3 method for class 'ppm'
    as.interact(object)

### Arguments

`object` | A fitted point process model (object of class `"ppm"`) or an interpoint interaction structure (object of class `"interact"`).

### Details

The function `as.interact` extracts the interpoint interaction structure from a suitable object.

An object of class `"interact"` describes an interpoint interaction structure, before it has been fitted to point pattern data. The irregular parameters of the interaction (such as the interaction range) are fixed, but the regular parameters (such as interaction strength) are undetermined. Objects of this class are created by the functions `Poisson`, `Strauss` and so on. The main use of such objects is in a call to `ppm`.

The function `as.interact` is generic, with methods for the classes `"ppm"`, `"fii"` and `"interact"`. The result is an object of class `"interact"` which can be printed.

### Value

An object of class `"interact"` representing the interpoint interaction. This object can be printed and plotted.

### Note on parameters

This function does not extract the fitted coefficients of the interaction. To extract the fitted interaction including the fitted coefficients, use `fitin`.

### Author(s)

Adrian Baddeley Adrian.Baddeley@curtin.edu.au

and Rolf Turner r.turner@auckland.ac.nz

### See Also

`fitin`, `ppm`.

### Examples

       data(cells)
       model <- ppm(cells, ~1, Strauss(0.07))
       f <- as.interact(model)
       f

[Package spatstat version 1.63-3 Index]