python—networkx:在一張圖中畫出多個子圖

通過plt.subplot可以在一張圖中畫出多個子圖

#coding: utf-8
#!/usr/bin/env python
"""
Draw a graph with matplotlib.
You must have matplotlib for this to work.
"""
__author__ = """Aric Hagberg ([email protected])"""
#    Copyright (C) 2004-2008
#    Aric Hagberg <[email protected]>
#    Dan Schult <[email protected]>
#    Pieter Swart <[email protected]>
#    All rights reserved.
#    BSD license.
#raise的使用要求這一步必須執行
try:
import matplotlib.pyplot as plt
except:
raise
import networkx as nx
#用grid_2d_graph()生成一個16個節點的網格圖
G=nx.grid_2d_graph(4,4)  #4x4 grid
pos=nx.spring_layout(G,iterations=100)
#開始畫各個小圖
plt.subplot(221)
nx.draw(G,pos,font_size=8)
plt.subplot(222)
nx.draw(G,pos,node_color='k',node_size=0,with_labels=False)
plt.subplot(223)
nx.draw(G,pos,node_color='g',node_size=250,with_labels=False,width=6)
#最後一幅子圖轉為有向圖
plt.subplot(224)
H=G.to_directed()
nx.draw(H,pos,node_color='b',node_size=20,with_labels=False)
plt.savefig("four_grids.png")
plt.show()