NetworkX 显示错误的颜色

Question

我正在尝试使用颜色绘制带有 networkx 的简单网络，但是我为节点提供的颜色未显示在图表上...

import networkx as nx
G = nx.Graph()

G.add_nodes_from([
    (4, {"color": "red"}),
    (5, {"color": "green"}),
])

nx.draw_networkx(G)

绘制此图：

为什么这些节点不是我分配给它们的颜色？

我正在尝试重现 https://networkx.org/documentation/stable/tutorial.html

中的示例

Answer 1

文档中的示例具有误导性 - 它甚至不显示带有颜色的图像。

值{"color": "red"}不用于改变颜色，只是在节点中保留额外的信息。您可以使用 {"first name": "James", "last name": "Bond", "number": "007"} 得到相同的结果

要设置颜色，您必须在绘制它们时使用列表

nx.draw(G, node_color=['red', 'green', 'blue'], with_labels=True)

import networkx as nx
import matplotlib.pyplot as plt

G = nx.Graph()

G.add_nodes_from([
    (4, {"color": "red"}),
    (5, {"color": "green"}),
    (7, {"first name": "James", "last name": "Bond", "number": "007"}),
])

nx.draw(G, node_color=['red', 'green', 'blue'], with_labels=True)
plt.show()

或者您将不得不使用 for-loop 来使用来自节点

的数据创建列表

import networkx as nx
import matplotlib.pyplot as plt

G = nx.Graph()

G.add_nodes_from([
    1,
    2,
    (4, {"color": "red"}),
    (5, {"color": "green"}),
    (7, {"first name": "James", "last name": "Bond", "number": "007"}),
    8,
    9,
   ('Hello', {"color": "red"}),
])

#color_map = ['red', 'green', 'blue']
color_map = []

for node in G:
    print(G.nodes[node])
    if 'color' in G.nodes[node]:
        color_map.append( G.nodes[node]['color'] )
    else: 
        color_map.append('blue')    
    
nx.draw(G, node_color=color_map, with_labels=True)
plt.show()

Answer 2

尝试：

import networkx as nx
G = nx.Graph()

G.add_nodes_from([
    (4, {"color": "red"}),
    (5, {"color": "green"}),
])

nx.draw_networkx(G, node_color=[i['color'] for i in dict(G.nodes(data=True)).values()])

输出：

NetworkX 显示错误的颜色

NetworkX shows wrong colors

python

networkx