as.function.leverage.ppm

0th

Percentile

Convert Leverage Object to Function of Coordinates

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

Keywords
manip, spatial
Usage
# S3 method for leverage.ppm
as.function(x, ...)
Arguments
x

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

Ignored.

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).

Value

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

See Also

as.im.leverage.ppm

Aliases
  • as.function.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
# }
Documentation reproduced from package spatstat, version 1.57-1, License: GPL (>= 2)

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