Extract or Replace Subset of a Layered Object
Extract or replace some or all of the layers of a layered object, or extract a spatial subset of each layer.
## 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
x |
A layered object (class |
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 |
drop |
Logical. If |
... |
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. |
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 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.
Usually an object of class "layered".
Adrian Baddeley Adrian.Baddeley@curtin.edu.au, Rolf Turner r.turner@auckland.ac.nz and Ege Rubak rubak@math.aau.dk
D <- distmap(cells)
L <- layered(D, cells,
plotargs=list(list(ribbon=FALSE), list(pch=16)))
L[-2]
L[, square(0.5)]
L[[3]] <- japanesepines
LPlease choose more modern alternatives, such as Google Chrome or Mozilla Firefox.