linnet {spatstat} | R Documentation |
Creates an object of class "linnet"
representing
a network of line segments.
linnet(vertices, m, edges)
vertices |
Point pattern (object of class |
m |
Adjacency matrix. A matrix of logical values equal to |
edges |
Edge list. A two-column matrix of integers,
specifying all pairs of vertices
that should be joined by an edge.
(Specify either |
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.
Object of class "linnet"
representing the linear network.
Ang Qi Wei aqw07398@hotmail.com and Adrian Baddeley Adrian.Baddeley@csiro.au http://www.maths.uwa.edu.au/~adrian/
simplenet
for an example of a linear network.
methods.linnet
for
methods applicable to linnet
objects.
# 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)