duplicated.ppp: Determine Duplicated Points in a Spatial Point Pattern
Description
Determines which points in a spatial point pattern
are duplicates of previous points, and returns a logical vector.
Usage
## S3 method for class 'ppp':
duplicated(x, \dots)
Arguments
x
A spatial point pattern
(object of class "ppp").
...
Ignored.
Value
A logical vector of length equal to the number of points in x.
Details
This is a method for the generic function duplicated 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 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.