spatstat (version 1.23-1)

as.interact: 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").

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.

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.

See Also

fitin, ppm.

Examples

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