# connected.linnet

##### Connected Components of a Linear Network

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.

##### 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`

.

##### Value

If `what="labels"`

, a factor.
If `what="components"`

, a list of linear networks.

##### See Also

##### 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)
# }
```

*Documentation reproduced from package spatstat, version 1.55-1, License: GPL (>= 2)*