spatstat (version 1.55-0)

connected.linnet: Connected Components of a Linear Network

Description

Find the topologically-connected components of a linear network.

Usage

# S3 method for linnet
connected(X, …, what = c("labels", "components"))

Arguments

X

A linear network (object of class "linnet").

…

Ignored.

what

Character string specifying the kind of result.

Value

If what="labels", a factor. If what="components", a list of linear networks.

Details

The function connected is generic. This is the method for linear networks (objects of class "linnet").

Two vertices of the network are connected if they are joined by a path in the network. This function divides the network into subsets, such that all points in a subset are connected to each other.

If what="labels" the return value is a factor with one entry for each vertex of X, identifying which connected component the vertex belongs to.

If what="components" the return value is a list of linear networks, which are the connected components of X.

See Also

thinNetwork

Examples

# NOT RUN {
   # remove some edges from a network to make it disconnected
   plot(simplenet, col="grey", main="", lty=2)
   A <- thinNetwork(simplenet, retainedges=-c(3,5))
   plot(A, add=TRUE, lwd=2)
   # find the connected components
   connected(A)
   cA <- connected(A, what="components")
   plot(cA[[1]], add=TRUE, col="green", lwd=2)
   plot(cA[[2]], add=TRUE, col="blue", lwd=2)
# }