Use this if you are using igraph from R
articulation_points finds the articulation points (or cut vertices)
articulation_points(graph) bridges(graph)
graph |
The input graph. It is treated as an undirected graph, even if it is directed. |
Articulation points or cut vertices are vertices whose removal increases the number of connected components in a graph. Similarly, bridges or cut-edges are edges whose removal increases the number of connected components in a graph. If the original graph was connected, then the removal of a single articulation point or a single bridge makes it undirected. If a graph contains no articulation points, then its vertex connectivity is at least two.
For articulation_points, a numeric vector giving the vertex
IDs of the articulation points of the input graph. For bridges, a
numeric vector giving the edge IDs of the bridges of the input graph.
Gabor Csardi csardi.gabor@gmail.com
biconnected_components, components,
is_connected, vertex_connectivity,
edge_connectivity
g <- disjoint_union( make_full_graph(5), make_full_graph(5) )
clu <- components(g)$membership
g <- add_edges(g, c(match(1, clu), match(2, clu)) )
articulation_points(g)
g <- make_graph("krackhardt_kite")
bridges(g)