python - 我如何显示 igraph 输出？

Question

这可能是一个非常简单的问题。我是 python 的新手，非常感谢所有帮助!

在我放在下面的代码中，我如何实际显示输出而不是内存对象？

Graph.clusters(g)
Out[106]: <igraph.clustering.VertexClustering at 0x1187659d0>

Graph.community_edge_betweenness(g, clusters=None, directed=True, weights=None)
Out[107]: <igraph.clustering.VertexDendrogram at 0x118765d90>

Answer 1

这取决于你到底想展示什么？让我们举个例子:

import igraph
g = igraph.Graph.Barabasi(n = 20, m = 3)
c = g.clusters()

print()在 Python 中调用 __str__()对象的方法，在 VertexClustering 的情况下将其转换为人类可读的内容，每一行代表一个簇(方括号中的簇ID)，并列出属于该簇的顶点ID。第一行给出了简单的描述:

>>> print(c)
Clustering with 20 elements and 1 clusters
[0] 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19

然后，您可以像这样访问每个集群的成员作为顶点 ID 列表:

>>> c[0]
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19]

如果是VertexDendrogram对象，igraph 的 print 方法甚至打印出漂亮的文本树状图:

>>> f = g.community_fastgreedy()
>>> print(f)
Dendrogram, 20 elements, 19 merges

7 3 14 10 5 16 1 0 9 8 6 2 4 18 12 13 19 15 17 11
| | |  |  | |  | | | | | | | |  |  |  |  |  |  |
`-' |  `--' |  | | | `-' | `-'  `--'  |  |  `--'
|  |   |   |  | | |  |  |  |    |    |  |   |  
`--'   |   |  `-' |  `--'  |    |    |  `---'  
|     |   |   |  |   |    |    |    |    |    
|     |   `---'  |   |    |    |    `----'    
|     |     |    |   |    |    |      |       
`-----'     `----'   |    `----'      |       
    |          |      |      |         |       
    |          `------'      `---------'       
    |             |               |            
    `-------------'               |            
            |                      |            
            `----------------------'

最后，您可以使用 igraph 出色的绘图功能显示您的结果:

i = g.community_infomap()
colors = ["#E41A1C", "#377EB8", "#4DAF4A", "#984EA3", "#FF7F00"]
g.vs['color'] = [None]
for clid, cluster in enumerate(i):
    for member in cluster:
        g.vs[member]['color'] = colors[clid]
g.vs['frame_width'] = 0
igraph.plot(g)

在这里，我们根据它们的集群(社区)成员身份为顶点着色: