spatstat.explore (version 3.1-0)

rectcontact: Contact Distribution Function using Rectangular Structuring Element

Description

Computes an estimate of the contact distribution function of a set, using a rectangular structuring element.

Usage

rectcontact(X, ..., asp = 1, npasses=4,
            eps = NULL, r = NULL, breaks = NULL, correction = c("rs", "km"))

Value

Object of class "fv".

Arguments

X

Logical-valued image. The TRUE values in the image determine the spatial region whose contact distribution function should be estimated.

...

Ignored.

asp

Aspect ratio for the rectangular metric. A single positive number. See rectdistmap for explanation.

npasses

Number of passes to perform in the distance algorithm. A positive integer. See rectdistmap for explanation.

eps

Pixel size, if the image should be converted to a finer grid.

r

Optional vector of distance values. Do Not Use This.

breaks

Do Not Use This.

correction

Character vector specifying the edge correction.

Author

Adrian Baddeley .

Details

To be written.

See Also

Hest

Examples

  ## make an image which is TRUE/FALSE inside/outside the letter R
  V <- letterR
  Frame(V) <- grow.rectangle(Frame(V), 0.5)
  Z <- as.im(V, value=TRUE, na.replace=FALSE)
  ## analyse
  plot(rectcontact(Z))