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


floyd_warshall_numpy(G, nodelist=None, weight='weight')[source]

Find all-pairs shortest path lengths using Floyd’s algorithm.

Parameters :

G : NetworkX graph

nodelist : list, optional

The rows and columns are ordered by the nodes in nodelist. If nodelist is None then the ordering is produced by G.nodes().

weight: string, optional (default= ‘weight’)

Edge data key corresponding to the edge weight.

Returns :

distance : NumPy matrix

A matrix of shortest path distances between nodes. If there is no path between to nodes the corresponding matrix entry will be Inf.


Floyd’s algorithm is appropriate for finding shortest paths in dense graphs or graphs with negative weights when Dijkstra’s algorithm fails. This algorithm can still fail if there are negative cycles. It has running time O(n^3) with running space of O(n^2).