linnet

From spatstat v1.36-0 by Adrian Baddeley

Create a Linear Network

Creates an object of class "linnet" representing a network of line segments.

Keywords: spatial

Usage

linnet(vertices, m, edges)

Arguments

vertices: Point pattern (object of class "ppp") specifying the vertices of the network.
m: Adjacency matrix. A matrix of logical values equal to TRUE when the corresponding vertices are joined by a line. (Specify either m or edges.)
edges: Edge list. A two-column matrix of integers, specifying all pairs of vertices that should be joined by an edge. (Specify either m or edges.)

Details

An object of class "linnet" represents a network of straight line segments in two dimensions. The function linnet creates such an object from the minimal information: the spatial location of each vertex (endpoint, crossing point or meeting point of lines) and information about which vertices are joined by an edge.

This function can take some time to execute, because the algorithm computes various properties of the network that are stored in the resulting object.

Value

Object of class "linnet" representing the linear network.

Examples

# letter 'A' specified by adjacency matrix
  v <- ppp(x=(-2):2, y=3*c(0,1,2,1,0), c(-3,3), c(-1,7))
  m <- matrix(FALSE, 5,5)
  for(i in 1:4) m[i,i+1] <- TRUE
  m[2,4] <- TRUE
  m <- m | t(m)
  letterA <- linnet(v, m)
  plot(letterA)

  # letter 'A' specified by edge list
  edg <- cbind(1:4, 2:5)
  edg <- rbind(edg, c(2,4))
  letterA <- linnet(v, edges=edg)

Documentation reproduced from package spatstat, version 1.36-0, License: GPL (>= 2)

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