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Periodogram of a univatiate point pattern

Source: R/estimator.R
periodogram.Rd

Given a multivariate point pattern ppp, compute the periodogram for each marginal point pattern.

Usage

periodogram(
  i,
  j,
  ppp,
  inten.formula = "~1",
  data.covariate = NULL,
  a = 0.025,
  return.DFT = FALSE,
  A1 = NULL,
  A2 = A1,
  ext.factor = NULL,
  endpt = 1.5,
  generate_freq. = generate_freq,
  taper. = taper,
  H.h.lambda.1. = H.h.lambda.1
)

Arguments

i

Mark index. An element in levels(spatstat.geom::marks(ppp)).

j

Mark index. An element in levels(spatstat.geom::marks(ppp)).

ppp

A point pattern of class "ppp".

inten.formula

A formula syntax in character format specifying the log-liner model for the intensity function, which is passed to ppm(). The default is constant intensity inten.formula = "~1".

data.covariate

Optional. The values of spatial covariates passed to the data argument in ppm().

a

Taper coefficient, a value within \((0,1/2)\). If a = 0, then taper is not applied. Default is a = 0.025.

return.DFT

If TRUE, also return the centered discrete Fourier transform (DFT).

A1, A2

Optional. Side lengths of the observation window.

ext.factor

Optional. If NULL (default), the frequency grid for the periodogram is not extended. Please keep this NULL unless you know what you are doing.

endpt

A positive value indicating the scale factor of the endpoint frequency.

generate_freq., taper., H.h.lambda.1.

Functions in their respective .R files.

Value

A matrix if return.DFT = FALSE; a list consisting of the periodogram and the centered DFT if return.DFT = TRUE.