Extract.ppx

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Extract Subset of Multidimensional Point Pattern

Extract a subset of a multidimensional point pattern.

Keywords
manip, spatial
Usage
## S3 method for class 'ppx':
[(x, i, ...)
Arguments
x
A multidimensional point pattern (object of class "ppx").
i
Subset index. A valid subset index in the usual Rsense, indicating which points should be retained.
...
Ignored.
Details

This function extracts a designated subset of a multidimensional point pattern.

The function [.ppx is a method for [ for the class "ppx". It extracts a designated subset of a point pattern. The argument i should be a subset index in the usual Rsense: either a numeric vector of positive indices (identifying the points to be retained), a numeric vector of negative indices (identifying the points to be deleted) or a logical vector of length equal to the number of points in the point pattern x. In the latter case, the points (x$x[i], x$y[i]) for which subset[i]=TRUE will be retained, and the others will be deleted. Use the function unmark to remove marks from a marked point pattern.

Value

• A multidimensional point pattern (of class "ppx") in the same domain.

ppx

• [.ppx
Examples
df <- data.frame(x=runif(4),y=runif(4),z=runif(4))
X <- ppx(data=df, coord.type=c("s","s","t"))
X[-2]
Documentation reproduced from package spatstat, version 1.29-0, License: GPL (>= 2)

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