spatstat (version 1.31-3)

Extract.layered: Extract Subset of a Layered Object

Description

Extract 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, ...)

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 retained.

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.

...

Ignored.

Value

• Usually an object of class "layered".

Details

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

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

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.

See Also

layered

Examples

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