NetworkX系列教程(4)-设置graph的信息

小书匠Graph图论

要画出美观的graph,需要对graph里面的节点,边,节点的布局都要进行设置,具体可以看官方文档:Adding attributes to graphs, nodes, and edges部分.

目录:

• 5.设置graph的信息
  • 5.1创建graph时添加属性
  • 5.2指定节点的属性
  • 5.3指定边的属性
  • 5.4显示graph

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注意:如果代码出现找不库,请返回第一个教程,把库文件导入.

5.设置graph的信息

5.1创建graph时添加属性

1. #G.clear() 
   

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2. G=nx.Graph() 
   

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3. G = nx.Graph(day="Friday") 
   

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4. print('Assign graph attributes when creating a new graph: ',G.graph) 
   

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5. G.graph['day'] = "Monday" 
   

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6. print('Assign graph attributes when have a graph: ',G.graph) 
   

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输出:

Assign graph attributes when creating a new graph: {'day': 'Friday'}
Assign graph attributes when have a graph: {'day': 'Monday'}

5.2指定节点的属性

1. #创建时设置 
   

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2. G.add_node(1, time='5pm') 
   

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3. G.add_nodes_from([3,4], time='2pm',color='g') 
   

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4.  
   

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5. #直接设置 
   

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6. G.nodes[1]['room'] = 714 
   

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7. G.nodes[1]['color'] = 'b' 
   

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8.  
   

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9. print(G.nodes.data()) 
   

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输出:

[(1, {'room': 714, 'time': '5pm', 'color': 'b'}), (3, {'time': '2pm', 'color': 'g'}), (4, {'time': '2pm', 'color': 'g'})]

5.3指定边的属性

1. #创建时设置 
   

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2. G.add_edge(1, 2, weight=4.7 ) 
   

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3. G.add_edges_from([(3, 4), (4, 5)], color='red',weight=10) 
   

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4. G.add_edges_from([(1, 2, {'color': 'blue'}), (2, 3, {'weight': 8})]) 
   

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5.  
   

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6. #直接设置 
   

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7. G[1][2]['weight'] = 4.7 
   

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8. G[1][2]['color'] = "blue" 
   

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9. G.edges[3, 4]['weight'] = 4.2 
   

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10. G.edges[1, 2]['color'] = "green" 
    

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11.  
    

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12. print('edge 1-2: ',G.edges[1,2]) 
    

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13. print('edge 3-4: ',G.edges[3,4]) 
    

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输出:

edge 1-2: {'weight': 4.7, 'color': 'green'}
edge 3-4: {'weight': 4.2, 'color': 'red'}

5.4显示graph

1. #生成节点标签 
   

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2. labels={} 
   

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3. labels[1]='1' 
   

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4. labels[2]='2' 
   

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5. labels[3]='3' 
   

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6. labels[4]='4' 
   

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7. labels[5]='5' 
   

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8.  
   

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9. #获取graph中的边权重 
   

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10. edge_labels = nx.get_edge_attributes(G,'weight') 
    

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11. print('weight of all edges:',edge_labels) 
    

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12.  
    

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13. #生成节点位置 
    

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14. pos=nx.circular_layout(G) 
    

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15. print('position of all nodes:',pos) 
    

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16.  
    

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17. #把节点画出来 
    

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18. nx.draw_networkx_nodes(G,pos,node_color='g',node_size=500,alpha=0.8) 
    

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19.  
    

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20. #把边画出来 
    

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21. nx.draw_networkx_edges(G,pos,width=1.0,alpha=0.5,edge_color='b') 
    

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22.  
    

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23. #把节点的标签画出来 
    

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24. nx.draw_networkx_labels(G,pos,labels,font_size=16) 
    

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25.  
    

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26. #把边权重画出来 
    

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27. nx.draw_networkx_edge_labels(G, pos, edge_labels) 
    

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28.  
    

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29. plt.axis('on') 
    

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30. #去掉坐标刻度 
    

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31. plt.xticks([]) 
    

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32. plt.yticks([]) 
    

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33. plt.show() 
    

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输出:

weight of all edges: {(1, 2): 4.7, (3, 4): 4.2, (2, 3): 8, (4, 5): 10}
position of all nodes: {1: array([1.00000000e+00, 2.38418583e-08]), 2: array([0.30901696, 0.95105658]), 3: array([-0.80901709, 0.58778522]), 4: array([-0.80901698, -0.58778535]), 5: array([ 0.30901711, -0.95105647])}

有权无向图