python—networkx：畫隨機幾何圖，找出中心節點並按路徑長度染色

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• • 隨機產生一個集合圖，內建路徑屬性，圖大小為1*1，找出距離中心[0.5, 0.5]最近的節點，並按照路徑染色。
    NetworkX Examples ? Drawing ? Random Geometric Graph
    
    
    

    <pre name="code" class="python">#coding:utf-8import networkx as nximport matplotlib.pyplot as pltG=nx.random_geometric_graph(200,0.125)# position is stored as node attribute data for random_geometric_graphpos=nx.get_node_attributes(G,'pos')# find node near center (0.5,0.5)找到中心節點並求最近的節點，設為ncenterdmin=1ncenter=0for n in pos:    x,y=pos[n]    d=(x-0.5)**2+(y-0.5)**2    if d<dmin:        ncenter=n        dmin=d# color by path length from node near center顏色定為紅色，程度<span style="font-family: Arial, Helvetica, sans-serif;">按距離中心點的路徑長度染色</span>p=nx.single_source_shortest_path_length(G,ncenter)plt.figure(figsize=(8,8))nx.draw_networkx_edges(G,pos,nodelist=[ncenter],alpha=0.4)nx.draw_networkx_nodes(G,pos,nodelist=p.keys(),                       node_size=80,                       node_color=p.values(),                       cmap=plt.cm.Reds_r)plt.xlim(-0.05,1.05)plt.ylim(-0.05,1.05)plt.axis('off')plt.savefig('random_geometric_graph.png')plt.show()

    
    

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python—networkx：畫隨機幾何圖，找出中心節點並按路徑長度染色