connectedComp {RBGL} | R Documentation

## Identify Connected Components in an Undirected Graph

### Description

The connected components in an undirected graph are identified. If the graph is directed then the weakly connected components are identified.

### Usage

    connectedComp(g)

### Arguments

`g` | graph with `edgemode` “undirected”

### Details

Uses a depth first search approach to identifying all the connected components of an undirected graph. If the input, `g`, is a directed graph it is first transformed to an undirected graph (using `ugraph`).

### Value

A list of length equal to the number of connected components in `g`. Each element of the list contains a vector of the node labels for the nodes that are connected.

### Author(s)

Vince Carey <stvjc@channing.harvard.edu>

### References

Boost Graph Library ( www.boost.org/libs/graph/doc/index.html )

The Boost Graph Library: User Guide and Reference Manual; by Jeremy G. Siek, Lie-Quan Lee, and Andrew Lumsdaine; (Addison-Wesley, Pearson Education Inc., 2002), xxiv+321pp. ISBN 0-201-72914-8

### See Also

`connComp`,`strongComp`, `ugraph`, `same.component`

### Examples

    con <- file(system.file("GXL/kmstEx.gxl",package="graph"), open="r")
    km <- fromGXL(con)
    close(con)
    km <- graph::addNode(c("F","G","H"), km)
    km <- addEdge("G", "H", km, 1)
    km <- addEdge("H", "G", km, 1)
    ukm <- ugraph(km)
    ukm
    edges(ukm)
    connectedComp(ukm)

[Package RBGL version 1.62.1 Index]