multiplicity.ppp

From spatstat v1.16-2 by Adrian Baddeley

Count Multiplicity of Duplicate Points

Counts the number of duplicates for each point in a spatial point pattern.

Keywords: utilities, spatial

Usage

multiplicity.ppp(x)

Arguments

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

Details

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.

Value

A vector of integers (multiplicities) of length equal to the number of points in x.

Examples

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]

Documentation reproduced from package spatstat, version 1.16-2, License: GPL (>= 2)

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