unique.ppp

From spatstat v1.36-0 by Adrian Baddeley

Extract Unique Points from a Spatial Point Pattern

Removes any points that are identical to other points in a spatial point pattern.

Keywords: methods, spatial

Usage

## S3 method for class 'ppp':
unique(x, \dots, warn=FALSE)
 ## S3 method for class 'ppx':
unique(x, \dots, warn=FALSE)

Arguments

x: A spatial point pattern (object of class "ppp" or "ppx").
...: Arguments passed to duplicated.ppp or duplicated.data.frame.
warn: Logical. If TRUE, issue a warning message if any duplicated points were found.

Details

These are methods for the generic function unique for point pattern datasets (of class "ppp", see ppp.object, or class "ppx").

Two points in a point pattern are deemed to be identical if their $x,y$ coordinates are the same, and their marks are also the same (if they carry marks). The Examples section illustrates how it is possible for a point pattern to contain a pair of identical points.

This function removes duplicate points in x, and returns a point pattern.

Value

Another point pattern object.

Examples

X <- ppp(c(1,1,0.5), c(2,2,1), window=square(3))
   unique(X)
   unique(X, rule="deldir")

Documentation reproduced from package spatstat, version 1.36-0, License: GPL (>= 2)

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