spatstat (version 1.29-0)

unique.ppp: Extract Unique Points from a Spatial Point Pattern

Description

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

Usage

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

Arguments

x

A spatial point pattern (object of class "ppp").

...

Arguments passed to duplicated.ppp.

warn

Logical. If TRUE, issue a warning message if any duplicated points were found.

Value

• Another point pattern object.

Details

This is a method for the generic function unique for point pattern datasets (of class "ppp", see ppp.object).

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.

See Also

ppp.object, duplicated.ppp, multiplicity.ppp

Examples

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