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 class '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)).