duplicated.ppp

0th

Percentile

Determine Duplicated Points in a Spatial Point Pattern

Determines which points in a spatial point pattern are duplicates of previous points, and returns a logical vector.

Keywords
methods, spatial
Usage
## S3 method for class 'ppp':
duplicated(x, \dots, rule=c("spatstat", "deldir"))

## S3 method for class 'ppx': duplicated(x, \dots)

Arguments
x
A spatial point pattern (object of class "ppp" or "ppx").
...
Ignored.
rule
Character string. The rule for determining duplicated points.
Details

These are methods for the generic function duplicated 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 determines which points in x duplicate other points that appeared earlier in the sequence. It returns a logical vector with entries that are TRUE for duplicated points and FALSE for unique (non-duplicated) points.

If rule="spatstat" (the default), duplicated points are determined by testing equality of their coordinates and marks using ==. This is the most stringent possible test. If rule="deldir", duplicated points are determined using the function duplicatedxy in the package deldir, which currently uses duplicated.data.frame. Setting rule="deldir" will ensure consistency with functions in the deldir package.

Value

  • A logical vector of length equal to the number of points in x.

See Also

ppp.object, unique.ppp, multiplicity.ppp

Aliases
  • duplicated.ppp
  • duplicated.ppx
Examples
X <- ppp(c(1,1,0.5), c(2,2,1), window=square(3))
   duplicated(X)
   duplicated(X, rule="deldir")
Documentation reproduced from package spatstat, version 1.37-0, License: GPL (>= 2)

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