runifpointOnLines

From spatstat v1.37-0 by Adrian Baddeley

Generate N Uniform Random Points On Line Segments

Given a line segment pattern, generate a random point pattern consisting of n points uniformly distributed on the line segments.

Keywords: spatial, datagen

Usage

runifpointOnLines(n, L)

Arguments

n: Number of points to generate.
L: Line segment pattern (object of class "psp") on which the points should lie.

Details

This command generates a point pattern consisting of n independent random points, each point uniformly distributed on the line segment pattern. This means that, for each random point,

the probability of falling on a particular segment is proportional to the length of the segment; and
given that the point falls on a particular segment, it has uniform probability density along that segment.

If n is a single integer, the result is an unmarked point pattern containing n points. If n is a vector of integers, the result is a marked point pattern, with m different types of points, where m = length(n), in which there are n[j] points of type j.

Value

A point pattern (object of class "ppp") with the same window as L.

Examples

X <- psp(runif(10), runif(10), runif(10), runif(10),  window=owin())
  Y <- runifpointOnLines(20, X)
  plot(X, main="")
  plot(Y, add=TRUE)
  Z <- runifpointOnLines(c(5,5), X)

Documentation reproduced from package spatstat, version 1.37-0, License: GPL (>= 2)

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