给定在 NetworkX 中创建的任何图 G,我希望能够在创建图之后为 G.edges() 分配一些权重。涉及的图有网格、erdos-reyni、barabasi-albert 等。 鉴于我的
G.edges()
:
[(0, 1), (0, 10), (1, 11), (1, 2), (2, 3), (2, 12), ...]
还有我的
weights
:
{(0,1):1.0, (0,10):1.0, (1,2):1.0, (1,11):1.0, (2,3):1.0, (2,12):1.0, ...}
如何为每条边分配相关权重?在这个简单的例子中,所有权重都是 1。 我尝试像这样直接将权重添加到 G.edges()
for i, edge in enumerate(G.edges()):
G.edges[i]['weight']=weights[edge]
但我收到此错误:
---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
<ipython-input-48-6119dc6b7af0> in <module>()
10
11 for i, edge in enumerate(G.edges()):
---> 12 G.edges[i]['weight']=weights[edge]
TypeError: 'instancemethod' object has no attribute '__getitem__'
既然G.edges()
是一个列表,为什么我不能像其他列表一样访问它的元素?
edges
是一个方法。
文档说要这样做:
G[source][target]['weight'] = weight
例如,以下内容对我有用:
import networkx as nx
G = nx.Graph()
G.add_path([0, 1, 2, 3])
G[0, 1]['weight'] = 3
>>> G.get_edge_data(0, 1)
{'weight': 3}
但是,你的代码类型确实失败了:
G.edges[0, 1]['weight'] = 3
---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
<ipython-input-14-97b10ad2279a> in <module>()
----> 1 G.edges[0][1]['weight'] = 3
TypeError: 'instancemethod' object has no attribute '__getitem__'
for e in G.edges():
G[e[0], e[1]] = weights[e]
g1.add_edge('Mark', 'Edward', weight = 3)
g1.add_edge('Joseph', 'Michael', weight = 3)
g1.add_edge('Joseph', 'Jason', weight = 4)
然后检查图表是否加权:
nx.is_weighted(g1)
正确按重量大小对权重进行分类:
elarge = [(u, v) for (u, v, d) in g1.edges(data=True) if d['weight'] > 4]
esmall = [(u, v) for (u, v, d) in g1.edges(data=True) if d['weight'] <= 4]
接下来显示加权图:
pos = nx.spring_layout(g1) # positions for all nodes
节点
nx.draw_networkx_nodes(g1, pos, node_size=100)
边缘
nx.draw_networkx_edges(g1, pos, edgelist=elarge,
width=5)
nx.draw_networkx_edges(g1, pos, edgelist=esmall,
width=5, alpha=0.5, edge_color='g', style='dashed')