英文:
Renumbering vertices in a graph in Networkx
问题
我使用以下代码生成了一个网络，N=2。然而，我想将顶点的编号从1改为0。我展示了当前和期望的输出。
import networkx as nx
N=2
def pos():
x, y = 1, N + 3 - 1
for _ in range(2 * N * (N + 1)):
yield (x, y)
y -= (x + 2) // (N + 3)
x = (x + 2) % (N + 3)
G = nx.Graph()
it_pos = pos()
for u in range(2 * N * (N + 1)):
G.add_node(u, pos=next(it_pos))
if u % (2 * N + 1) < N:
for v in (u - 2 * N - 1, u - N - 1, u - N):
if G.has_node(v):
G.add_edge(u, v)
elif u % (2 * N + 1) == N:
G.add_edge(u, u - N)
elif u % (2 * N + 1) < 2 * N:
for v in (u - 1, u - N - 1, u - N):
G.add_edge(u, v)
else:
for v in (u - 1, u - N - 1):
G.add_edge(u, v)
nx.draw(G, nx.get_node_attributes(G, 'pos'), with_labels=True, font_weight='bold')
当前输出为：
期望的输出是：
英文:
I am generating a network using the code below for N=2. However, I would like to renumber the vertices starting from 0 and not 1. I present the current and expected outputs.
import networkx as nx
N=2
def pos():
x, y = 1, N + 3 - 1
for _ in range(2 * N * (N + 1)):
yield (x, y)
y -= (x + 2) // (N + 3)
x = (x + 2) % (N + 3)
G = nx.Graph()
it_pos = pos()
for u in range(2 * N * (N + 1)):
G.add_node(u+1, pos=next(it_pos))
if u % (2 * N + 1) < N:
for v in (u - 2 * N - 1, u - N - 1, u - N):
if G.has_node(v + 1):
G.add_edge(u + 1, v + 1)
elif u % (2 * N + 1) == N:
G.add_edge(u + 1, u - N + 1)
elif u % (2 * N + 1) < 2 * N:
for v in (u - 1, u - N - 1, u - N):
G.add_edge(u + 1, v + 1)
else:
for v in (u - 1, u - N - 1):
G.add_edge(u + 1, v + 1)
nx.draw(G, nx.get_node_attributes(G, 'pos'), with_labels=True, font_weight='bold')
The current output is
The expected output is
答案1
得分: 1
你可以使用nx.relabel_nodes函数（文档在这里）：
import networkx as nx
N=2
def pos():
x, y = 1, N + 3 - 1
for _ in range(2 * N * (N + 1)):
yield (x, y)
y -= (x + 2) // (N + 3)
x = (x + 2) % (N + 3)
G = nx.Graph()
it_pos = pos()
for u in range(2 * N * (N + 1)):
G.add_node(u+1, pos=next(it_pos))
if u % (2 * N + 1) < N:
for v in (u - 2 * N - 1, u - N - 1, u - N):
if G.has_node(v + 1):
G.add_edge(u + 1, v + 1)
elif u % (2 * N + 1) == N:
G.add_edge(u + 1, u - N + 1)
elif u % (2 * N + 1) < 2 * N:
for v in (u - 1, u - N - 1, u - N):
G.add_edge(u + 1, v + 1)
else:
for v in (u - 1, u - N - 1):
G.add_edge(u + 1, v + 1)
#重新标记节点
G=nx.relabel_nodes(G,{i:i-1 for i in range(1,G.number_of_nodes()+1)},copy=False)
nx.draw(G, nx.get_node_attributes(G, 'pos'), with_labels=True, font_weight='bold')
英文:
You could use the nx.relabel_nodes function (doc here):
import networkx as nx
N=2
def pos():
x, y = 1, N + 3 - 1
for _ in range(2 * N * (N + 1)):
yield (x, y)
y -= (x + 2) // (N + 3)
x = (x + 2) % (N + 3)
G = nx.Graph()
it_pos = pos()
for u in range(2 * N * (N + 1)):
G.add_node(u+1, pos=next(it_pos))
if u % (2 * N + 1) < N:
for v in (u - 2 * N - 1, u - N - 1, u - N):
if G.has_node(v + 1):
G.add_edge(u + 1, v + 1)
elif u % (2 * N + 1) == N:
G.add_edge(u + 1, u - N + 1)
elif u % (2 * N + 1) < 2 * N:
for v in (u - 1, u - N - 1, u - N):
G.add_edge(u + 1, v + 1)
else:
for v in (u - 1, u - N - 1):
G.add_edge(u + 1, v + 1)
#relabelling nodes
G=nx.relabel_nodes(G,{i:i-1 for i in range(1,G.number_of_nodes()+1)},copy=False)
nx.draw(G, nx.get_node_attributes(G, 'pos'), with_labels=True, font_weight='bold')
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