Extract Unique Points from a Spatial Point Pattern
Removes any points that are identical to other points in a spatial point pattern.
## S3 method for class 'ppp': unique(x, \dots)
- A spatial point pattern
(object of class
This is a method for the generic function
point pattern datasets (of class
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
and returns a point pattern.
- Another point pattern object.
X <- ppp(c(1,1,0.5), c(2,2,1), window=square(3)) unique(X)