Extract.layered: Extract or Replace Subset of a Layered Object

In spatstat.geom: Geometrical Functionality of the 'spatstat' Family

Extract or Replace Subset of a Layered Object

Description

Extract or replace some or all of the layers of a layered object, or extract a spatial subset of each layer.

Usage

  ## S3 method for class 'layered'
x[i, j, drop=FALSE, ...]

  ## S3 replacement method for class 'layered'
x[i] <- value

  ## S3 replacement method for class 'layered'
x[[i]] <- value

Arguments

x	A layered object (class "layered").
i	Subset index for the list of layers. A logical vector, integer vector or character vector specifying which layers are to be extracted or replaced.
j	Subset index to be applied to the data in each layer. Typically a spatial window (class "owin").
drop	Logical. If i specifies only a single layer and drop=TRUE, then the contents of this layer will be returned.
...	Additional arguments, passed to other subset methods if the subset index is a window.
value	List of objects which shall replace the designated subset, or an object which shall replace the designated element.

Details

A layered object represents data that should be plotted in successive layers, for example, a background and a foreground. See layered.

The function [.layered extracts a designated subset of a layered object. It is a method for [ for the class "layered".

The functions [<-.layered and [[<-.layered replace a designated subset or designated entry of the object by new values. They are methods for [<- and [[<- for the "layered" class.

The index i specifies which layers will be retained. It should be a valid subset index for the list of layers.

The index j will be applied to each layer. It is typically a spatial window (class "owin") so that each of the layers will be restricted to the same spatial region. Alternatively j may be any subset index which is permissible for the "[" method for each of the layers.

Value

Usually an object of class "layered".

Author(s)

\spatstatAuthors

See Also

layered

Examples

 D <- distmap(cells)
 L <- layered(D, cells,
              plotargs=list(list(ribbon=FALSE), list(pch=16)))

 L[-2]
 L[, square(0.5)]

 L[[3]] <- japanesepines
 L

spatstat.geom documentation built on Sept. 18, 2024, 9:08 a.m.