spatstat (version 1.64-1)

Extract.influence.ppm: Extract Subset of Influence Object

Description

Extract a subset of an influence object, or extract the influence values at specified locations.

Usage

# S3 method for influence.ppm
[(x, i, ...)

Arguments

x

A influence object (of class "influence.ppm") computed by influence.ppm.

i

Subset index (passed to [.ppp). Either a spatial window (object of class "owin") or an integer index.

Ignored.

Value

Another object of class "influence.ppm".

Details

An object of class "influence.ppm" contains the values of the likelihood influence for a point process model, computed by influence.ppm. This is effectively a marked point pattern obtained by marking each of the original data points with its likelihood influence.

This function extracts a designated subset of the influence values, either as another influence object, or as a vector of numeric values.

The function [.influence.ppm is a method for [ for the class "influence.ppm". The argument i should be an index applicable to a point pattern. It may be either a spatial window (object of class "owin") or a sequence index. The result will be another influence object (of class influence.ppm).

To extract the influence values as a numeric vector, use marks(as.ppp(x)).

See Also

influence.ppm.

Examples

# NOT RUN {
   fit <- ppm(cells, ~x)
   infl <- influence(fit)
   b <- owin(c(0.1, 0.3), c(0.2, 0.4))
   infl[b]
   infl[1:5]
   marks(as.ppp(infl))[1:3]
# }