我在python中很新,我想在网络中找到两个没有边缘的随机节点,但我的程序有时会返回空列表或两个以上的节点。 任何人都可以帮助我,我的计划是:
import networkx as nx
import random
n=6
m=10
G=nx.gnm_random_graph( n, m, seed=None, directed=True)
result = []
nodes = random.sample(G.nodes(), 2)
for u in nodes:
for v in nodes:
if u != v and G.has_edge(u,v) is False and G.has_edge(v,u) is False:
result.append((u,v))
else:
nodes = random.sample(G.nodes(), 2)
print(result)
答案 0 :(得分:2)
如果您只想要一对节点,则没有理由制作列表。找到那对!
while True:
u, v = random.sample(G.nodes(), 2)
if not (G.has_edge(u, v) or G.has_edge(v, u)):
break
现在直接使用u
和v
。
答案 1 :(得分:0)
import networkx as nx
import random
n=6
m=10
G=nx.gnm_random_graph( n, m, seed=None, directed=True)
nodes = G.nodes()
def select_2_random_unconnected_nodes(node_list, graph):
selected_node = random.choice(node_list)
# obtain all the nodes connected to the selected node
connected_nodes = [n for _, n in G.edges(selected_node)]
print(connected_nodes + [selected_node])
# a feasible node is one not in connected_nodes and also not the first selected_node
feasible_nodes = [feasible_n for feasible_n in node_list if feasible_n not in connected_nodes + [selected_node]]
# select a second node from the feasible_nodes list
select_second_node = random.choice(feasible_nodes)
return selected_node, select_second_node