CODEWITHSUNDEEP
pythonmatplotlibgraphnetworkx
Kathryn
Kathryn

Reputation: 123

How to show node labels when using matplotlib.pyplot?

I'm using Python to conduct social network analysis, very simple kind, and as a newbie (to both SNA and Python).

When drawing a graph using Terminal on my mac, I've tried every method I can but still can only draw nodes and edges, but no label of nodes in or beside them.

What scripts should I use to make the labels visible?

>>> import networkx as nx
>>> import networkx.generators.small as gs
>>> import matplotlib.pyplot as plt
>>> g = gs.krackhardt_kite_graph()
>>> nx.draw(g)
>>> plt.show()

Upvotes: 2

Views: 4968

Answers (2)

Joel
Joel

Reputation: 23887

EdChum gave a good answer. Another option which will by default not show the axes and produces a graph that takes up slightly more of the figure is to use nx.draw but give it the argument with_labels = True. (for nx.draw, you need to set with_labels to True, but for nx.draw_networkx it defaults to True).

import networkx as nx
import networkx.generators.small as gs
import matplotlib.pyplot as plt
g = gs.krackhardt_kite_graph()
nx.draw(g,with_labels=True)
plt.savefig('tmp.png')

enter image description here

Be aware that there is a bug such that sometimes plt.show() will not show the labels. From what I've been able to tell, it's not in networkx, but rather has something to do with the rendering. It saves fine, so I haven't worried about following up on it in detail. It shows up for me using ipython on a macbook. Not sure what other systems it's on. More detail at pylab/networkx; no node labels displayed after update

Upvotes: 5

EdChum
EdChum

Reputation: 394319

Try using draw_networkx:

import networkx as nx
import networkx.generators.small as gs
import matplotlib.pyplot as plt
g = gs.krackhardt_kite_graph()
nx.draw_networkx(g)
plt.show()

This results in:

enter image description here

with_labels is by default True so not necessary to specify

Upvotes: 3

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