Create a Linear Network
Creates an object of class
a network of line segments.
linnet(vertices, m, edges)
- Point pattern (object of class
"ppp") specifying the vertices of the network.
- Adjacency matrix. A matrix of logical values equal to
TRUEwhen the corresponding vertices are joined by a line. (Specify either
- Edge list. A two-column matrix of integers,
specifying all pairs of vertices
that should be joined by an edge.
An object of class
"linnet" represents a network of
straight line segments in two dimensions. The function
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.
- Object of class
"linnet"representing the linear network.
simplenet for an example of a linear network.
# 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)