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Finds the topologically-connected components of a point pattern, when all pairs of points closer than a threshold distance are joined.
# S3 method for ppp
connected(X, R, …)A point pattern (object of class "ppp").
Threshold distance. Pairs of points closer than R units apart
will be joined together.
Other arguments, not recognised by these methods.
A point pattern, equivalent to X except that the points
have factor-valued marks, with levels corresponding to the
connected components.
This function can be used to identify clumps of points in a point pattern.
The function connected is generic. This is the method for
point patterns (objects of class "ppp").
The point pattern X is first converted into an abstract graph
by joining every pair of points that lie closer than R units
apart. Then the connected components of this graph are identified.
Two points in X belong to the same connected component if they
can be reached by a series of steps between points of X,
each step being shorter than R units in length.
The result is a vector of labels for the points of X
where all the points in a connected component have the same label.
# NOT RUN {
Y <- connected(redwoodfull, 0.1)
if(interactive()) {
plot(Y, cols=1:length(levels(marks(Y))),
main="connected(redwoodfull, 0.1)")
}
# }
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