# articulation.points

From igraph v0.5.5-3
by Gabor Csardi

##### Articulation points of a graph

Articuation points or cut vertices are vertices whose removal increases the number of connected components in a graph.

- Keywords
- graphs

##### Usage

`articulation.points(graph)`

##### Arguments

- graph
- The input graph. It is treated as an undirected graph, even if it is directed.

##### Details

Articuation points or cut vertices are vertices whose removal increases the number of connected components in a graph.

##### Value

- A numeric vector giving the vertex ids of the articulation points of the input graph.

##### concept

Articulation point

##### See Also

`biconnected.components`

, `clusters`

,
`is.connected`

, `vertex.connectivity`

##### Examples

```
g <- graph.disjoint.union( graph.full(5), graph.full(5) )
clu <- clusters(g)$membership
g <- add.edges(g, c(which(clu==0), which(clu==1))-1)
articulation.points(g)
```

*Documentation reproduced from package igraph, version 0.5.5-3, License: GPL (>= 2)*

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