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Note

This documents the development version of NetworkX. Documentation for the current release can be found here.

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networkx.algorithms.dag.transitive_closure_dag

transitive_closure_dag(G, topo_order=None)

Returns the transitive closure of a directed acyclic graph.

This function is faster than the function transitive_closure, but fails if the graph has a cycle.

The transitive closure of G = (V,E) is a graph G+ = (V,E+) such that for all v, w in V there is an edge (v, w) in E+ if and only if there is a non-null path from v to w in G.

Parameters

• G (NetworkX DiGraph) – A directed acyclic graph (DAG)

• topo_order (list or tuple, optional) – A topological order for G (if None, the function will compute one)

Returns

The transitive closure of G

Return type

NetworkX DiGraph

Raises

• NetworkXNotImplemented – If G is not directed

• NetworkXUnfeasible – If G has a cycle

Notes

This algorithm is probably simple enough to be well-known but I didn’t find a mention in the literature.