spatstat.core (version 2.3-1)

as.function.leverage.ppm: Convert Leverage Object to Function of Coordinates

Description

Converts an object of class "leverage.ppm" to a function of the \(x\) and \(y\) coordinates.

Usage

# S3 method for leverage.ppm
as.function(x, ...)

Arguments

x

Object of class "leverage.ppm" produced by leverage.ppm.

…

Ignored.

Value

A function in the R language, also belonging to the class "funxy".

Details

An object of class "leverage.ppm" represents the leverage function of a fitted point process model. This command converts the object to a function(x,y) where the arguments x and y are (vectors of) spatial coordinates. This function returns the leverage values at the specified locations (calculated by referring to the nearest location where the leverage has been computed).

See Also

as.im.leverage.ppm

Examples

# NOT RUN {
  X <- rpoispp(function(x,y) { exp(3+3*x) })
  fit <- ppm(X ~x+y)
  lev <- leverage(fit)
  f <- as.function(lev)
  
  f(0.2, 0.3)  # evaluate at (x,y) coordinates
  y <- f(X)    # evaluate at a point pattern
# }