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minimum_spanning_edges¶
- minimum_spanning_edges(G, weight='weight', data=True)[source]¶
Generate edges in a minimum spanning forest of an undirected weighted graph.
A minimum spanning tree is a subgraph of the graph (a tree) with the minimum sum of edge weights. A spanning forest is a union of the spanning trees for each connected component of the graph.
Parameters : G : NetworkX Graph
weight : string
Edge data key to use for weight (default ‘weight’).
data : bool, optional
If True yield the edge data along with the edge.
Returns : edges : iterator
A generator that produces edges in the minimum spanning tree. The edges are three-tuples (u,v,w) where w is the weight.
Notes
Uses Kruskal’s algorithm.
If the graph edges do not have a weight attribute a default weight of 1 will be used.
Modified code from David Eppstein, April 2006 http://www.ics.uci.edu/~eppstein/PADS/
Examples
>>> G=nx.cycle_graph(4) >>> G.add_edge(0,3,weight=2) # assign weight 2 to edge 0-3 >>> mst=nx.minimum_spanning_edges(G,data=False) # a generator of MST edges >>> edgelist=list(mst) # make a list of the edges >>> print(sorted(edgelist)) [(0, 1), (1, 2), (2, 3)]