multiplicity.ppp

0th

Percentile

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.

Aliases
• multiplicity.ppp
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 1.9-2, License: GPL version 2 or newer

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