is_forest¶
- is_forest(G)[source]¶
Returns True if
G
is a forest.A forest is a graph with no undirected cycles.
For directed graphs,
G
is a forest if the underlying graph is a forest. The underlying graph is obtained by treating each directed edge as a single undirected edge in a multigraph.- Parameters
- Ggraph
The graph to test.
- Returns
- bbool
A boolean that is True if
G
is a forest.
See also
Notes
In another convention, a directed forest is known as a polyforest and then forest corresponds to a branching.