[英]Visualizing graph in Python using NetworkX
我正在尝试在NetworkX中可视化图形。 我需要像这样给图形着色:中心节点需要着色为深色。 然后,所有较远的节点都需要变浅,但是当我运行代码时,出现此错误:
错误:无法将参数类型<class'numpy.ndarray'>转换为行上的rgba数组:
nx.draw_networkx_nodes(G,pos,nodelist=p.keys(),node_size=90,
node_color=p.values(),cmap=plt.cm.Reds_r)
我认为问题出在:
node_color=p.values()
代码是:
import numpy
import pandas
import networkx as nx
import unicodecsv as csv
import community
import matplotlib.pyplot as plt
# Generate the Graph
G=nx.davis_southern_women_graph()
# Create a Spring Layout
pos=nx.spring_layout(G)
# Find the center Node
dmin=1
ncenter=0
for n in pos:
x,y=pos[n]
d=(x-0.5)**2+(y-0.5)**2
if d<dmin:
ncenter=n
dmin=d
""" returns a dictionary of nodes and their distance to the node
supplied as an argument. We will then use these distances
to determine colors"""
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=90,
node_color=p.values(),cmap=plt.cm.Reds_r)
plt.show()
完整回溯
Traceback (most recent call last):
File "<ipython-input-4-da1414ba5e14>", line 1, in <module>
runfile('C:/Users/Desktop/Marvel/finding_key_players.py', wdir='C:/Users/Desktop/Marvel')
File "C:\Users\Anaconda33\lib\site- packages\spyderlib\widgets\externalshell\sitecustomize.py", line 685, in runfile
execfile(filename, namespace)
File "C:\Users\Anaconda33\lib\site packages\spyderlib\widgets\externalshell\sitecustomize.py", line 85, in execfile
exec(compile(open(filename, 'rb').read(), filename, 'exec'), namespace)
File "C:/Users/Desktop/Marvel/finding_key_players.py", line 70, in
<module>
cmap=plt.cm.Reds_r)
File "C:\Users\Anaconda33\lib\site-packages\networkx\drawing\nx_pylab.py", line 399, in draw_networkx_nodes
label=label)
File "C:\Users\Anaconda33\lib\site-packages\matplotlib\axes\_axes.py", line 3606, in scatter
colors = mcolors.colorConverter.to_rgba_array(c, alpha)
File "C:\Users\Anaconda33\lib\site-packages\matplotlib\colors.py", line 391, in to_rgba_array
if alpha > 1 or alpha < 0:
ValueError: Cannot convert argument type <class 'numpy.ndarray'> to rgba array
错误出在绘制节点的函数中。 必须将p.keys()
值放在nodelist
和node_color
的列表中,否则它将不起作用。
因此正确的行是:
nx.draw_networkx_nodes(G,pos,nodelist=list(p.keys()),node_size=80,node_color=list(p.values()), cmap=plt.cm.Reds_r)
plt.axis('off')
plt.show()
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