Python - Networkx：具有一定权重的邻居

Question

本题设置为python 2.7 using the package networkx: https://networkx.github.io/documentation/stable/reference/classes/generated/networkx.Graph.neighbors.html

我正在寻找一种使用函数 "networkx.Graph.neighbors" 的方法，该函数 returns 我所有具有特定权重值（或 higher/lower 比特定值）的邻居。

有什么建议可以实现吗？

提前致谢:)。蒂姆

Answer 1

假设您要根据 weight.Creating 下图过滤 'c' 节点邻居：

    G = nx.Graph()
    G.add_edge('a', 'b', weight=0.6)
    G.add_edge('a', 'c', weight=0.2)
    G.add_edge('c', 'd', weight=0.1)
    G.add_edge('c', 'e', weight=0.7)
    G.add_edge('c', 'f', weight=0.9)
    G.add_edge('a', 'd', weight=0.3)

    list_neighbors=G.neighbors('c')
    for i in list_neighbors:
        if G.edges[('c',i)]['weight']>0.5:
            print (G.edges[('c',i)])

给出： {'weight'：0.7} {'weight'：0.9} 希望这能回答您的问题。如果您需要有关如何使用权重的更多信息，请参阅 link。 https://networkx.github.io/documentation/stable/auto_examples/drawing/plot_weighted_graph.html

Answer 2

我假设 "all the neighbors with a certain weight value" 指的是节点权重。我将执行查找权重大于特定值的邻居的示例。

import networkx as nx
import random

G = nx.Graph()

#now create nodes with random weights.  If this notation is
#unfamiliar, read up on list comprehensions.  They make life much easier.
nodes = [(node, {'weight':random.random()}) for node in range(10)]
G.add_nodes_from(nodes)

#now G has the nodes and they each have a random weight.
G.nodes(data=True)
> [(0, {'weight': 0.42719462610483916}),
 (1, {'weight': 0.13985473528922154}),
 (2, {'weight': 0.06889096983404697}),
 (3, {'weight': 0.10772762947744585}),
 (4, {'weight': 0.24497933676194383}),
 (5, {'weight': 0.18527691296273396}),
 (6, {'weight': 0.16379510964497113}),
 (7, {'weight': 0.5481883941716088}),
 (8, {'weight': 0.3782931298078134}),
 (9, {'weight': 0.5902126428368549})]

#now create edges from 0 to all other nodes
zero_edges = [(0,u) for u in range(1,10)]
G.add_edges_from(zero_edges)

#now find all neighbors of 0 with weight > 0.5
heavy_neighbors = [nbr for nbr in G.neighbors(0) if G.node[nbr]['weight']>0.5]
heavy_neighbors
>[7,9]

如果您愿意，也可以通过将外部 [ 和 ] 替换为 ( 和 ) 来使 heavy_neighbors 成为生成器。

Python - Networkx：具有一定权重的邻居

Python - Networkx: Neighbours with certain weight

neighbours

networkx

python-2.7