python - 我怎样才能从图中得到有向树？

Question

import networkx as nx
G = nx.Graph()
G.add_edge(1,2)
G.add_edge(2,3)
G.add_edge(3,5)
G.add_edge(4,6)
G.add_edge(1,6)
G.add_edge(2,6)
G.add_edge(7,8)
G.add_edge(9,8)
mst=nx.prim_mst(G)# a generator of MST edges

我有一棵树。如何获得根为 4 的有向树？

Answer 1

从节点4获取广度优先搜索的有向树:

tree = nx.bfs_tree(G, 4)

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从节点4获取深度优先搜索的有向树:

tree = nx.dfs_tree(G, 4)

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图表是这样生成的:

import matplotlib.pyplot as plt
import networkx as nx

G = nx.Graph()
G.add_edge(1,2)
G.add_edge(2,3)
G.add_edge(3,5)
G.add_edge(4,6)
G.add_edge(1,6)
G.add_edge(2,6)
G.add_edge(7,8)
G.add_edge(9,8)

tree = nx.bfs_tree(G, 4)
nx.draw(tree)
plt.savefig('/tmp/bfs_image.png')