如何在 Networkx 图上添加箭头

Question

我用 Python 中的 networkx 库制作了一个图表。现在我想在图表的线条上添加箭头，但看起来我做错了什么。这是我的代码：

import networkx as nx

analysis_graph = nx.Graph()
# I have also tried with DiGraph() but it still does not work

node_list = ["A", "B", "C", "D", "E", "F"]

analysis_graph.add_nodes_from(node_list)
#print(analysis_graph.nodes())

nx.draw(analysis_graph, with_labels = True)
relation_list = [['A', 'B'],
                 ['A', 'C'],
                 ['B', 'D'],
                 ['C', 'E'],
                 ['D', 'F'],
                 ['E', 'D'],
                 ['C', 'E'],
                 ['B', 'D'],                 
                 ['C', 'F'],
                 ['A', 'E'],
                 ['B', 'C'],                 
                 ['B', 'F'],
                 ['D', 'A']]

analysis_graph = nx.from_edgelist(relation_list)
print(nx.info(analysis_graph))
nx.draw(analysis_graph, with_labels = True, arrowsize=20, arrowstyle='fancy')

我做错了什么？

Answer 1

要绘制箭头，图形显然必须是 DiGraph 对象。如果我更改以下行：

analysis_graph = nx.from_edgelist(relation_list)

到

analysis_graph = nx.from_edgelist(relation_list, create_using=nx.DiGraph)

我确实得到了想要的输出。

您之前在第 2 行中尝试实例化 DiGraph 对象（忽略空格）

analysis_graph = nx.DiGraph()

没有效果，因为您在调用 nx.from_edgelist 时覆盖了 analysis_graph 对象。你可能想写的是

analysis_graph = nx.DiGraph()
analysis_graph.add_nodes_from(nodelist)
analysis_graph.add_edges_from(relation_list)

如何在 Networkx 图上添加箭头

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