chordal_graph_treewidth#

chordal_graph_treewidth(G)[source]#

Returns the treewidth of the chordal graph G.

Parameters:

Ggraph: A NetworkX graph

Returns:

treewidthint: The size of the largest clique in the graph minus one.

Raises:

NetworkXError: The algorithm does not support DiGraph, MultiGraph and MultiDiGraph. The algorithm can only be applied to chordal graphs. If the input graph is found to be non-chordal, a NetworkXError is raised.

References

[1]

https://en.wikipedia.org/wiki/Tree_decomposition#Treewidth

Examples

>>> e = [
...     (1, 2),
...     (1, 3),
...     (2, 3),
...     (2, 4),
...     (3, 4),
...     (3, 5),
...     (3, 6),
...     (4, 5),
...     (4, 6),
...     (5, 6),
...     (7, 8),
... ]
>>> G = nx.Graph(e)
>>> G.add_node(9)
>>> nx.chordal_graph_treewidth(G)
3