Count Multiplicity of Duplicate Points
Counts the number of duplicates for each point in a spatial point pattern.
- A spatial point pattern
(object 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.
For each point in
x, this function counts how many
points are identical to it, and returns the vector of counts.
- A vector of integers (multiplicities) of length equal to the
number of points in
X <- ppp(c(1,1,0.5), c(2,2,1), window=square(3)) m <- multiplicity.ppp(X) # unique points in X, marked by multiplicity first <- !duplicated(X) Y <- X[first] %mark% m[first]