Warning

This documents an unmaintained version of NetworkX. Please upgrade to a maintained version and see the current NetworkX documentation.

# networkx.algorithms.shortest_paths.weighted.bellman_ford_path_length¶

bellman_ford_path_length(G, source, target, weight='weight')[source]

Returns the shortest path length from source to target in a weighted graph.

Parameters: G (NetworkX graph) source (node label) – starting node for path target (node label) – ending node for path weight (string, optional (default=’weight’)) – Edge data key corresponding to the edge weight length – Shortest path length. number NodeNotFound – If source is not in G. NetworkXNoPath – If no path exists between source and target.

Examples

>>> G=nx.path_graph(5)
>>> print(nx.bellman_ford_path_length(G,0,4))
4


Notes

Edge weight attributes must be numerical. Distances are calculated as sums of weighted edges traversed.