How to Plot Graph

Ed S

May 02, 2023 15:59

Suppose I've created a graph per the max cut problem graphs in "Ocean Programs for Beginners", 2.1 Setting Up the Problem" like this:

import networkx as nx

G = nx.Graph()

G.add_node(1)

G.add_node(2)

G.add_node(3)

G.add_node(4)

G.add_node(5)

G.add_edge(2, 1)

G.add_edge(3, 1)

G.add_edge(4, 2)

G.add_edge(4, 3)

G.add_edge(5, 3)

G.add_edge(5, 4)

I tried to display the graph using:

nx.draw(G)

plt.margins(0.2)

plt.show()

In the Leap development environment.

The Draw()\Show() functions didn't display the graph.

How can I display the graph?

Thanks, Ed

Comments

3 comments

Tanjid I (Report)
May 02, 2023 23:35 (Edited May 02, 2023 23:36)
Hi Ed,

Thank you for using D-Wave Systems.

Can you please confirm what you're defining `plt` as? I'm assuming that you're importing pyplot as plt, such as: `import matplotlib.pyplot as plt`.

It is possible that the graph isn't showing is because of `nx.draw(G)`, as a result of the version incompatibility between NetworkX and Matplotlib.

In older versions of NetworkX, the nx.draw() function was the recommended method for drawing graphs. However, with the release of newer versions of NetworkX, the nx.draw() function has been deprecated and replaced with the more flexible nx.draw_networkx() function.

Therefore, if you are using an older version of NetworkX with a newer version of Matplotlib, nx.draw(G) may not work as expected. In this case, you can try using nx.draw_networkx().

An example of a working code snippet would look following:
```
import matplotlib.pyplot as plt
import networkx as nx

G = nx.Graph()
G.add_node(1)
G.add_node(2)
G.add_node(3)
G.add_node(4)
G.add_node(5)

G.add_edge(2, 1)
G.add_edge(3, 1)
G.add_edge(4, 2)
G.add_edge(4, 3)
G.add_edge(5, 3)
G.add_edge(5, 4)

# to display the graph
# nx.draw(G)
pos = nx.spring_layout(G)
nx.draw_networkx(G, pos=pos)
plt.margins(0.2)    
plt.show()
```
I hope this helps.

Best Regards,
Tanjid
0

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Ed S (Report)
May 03, 2023 16:04

Hi Tanjid,

I copied and pasted your example code exactly as you listed in your comment into a new .py file in the Leap IDE.

I ran the code. I did not see any plot of the graph.

I have Terminal tab selected.

I'm new to using this IDE. So, I don't know if I have to select a specific output window to see the plot.

Thank you for your help.

Also, any chance you could answer my other questions?

Ed

0

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Tanjid I (Report)
May 04, 2023 15:51 (Edited May 04, 2023 15:52)
Hi Ed,

The code snippet would work with python IDE's. However, Leap IDE doesn't render graphs on the fly. You can render graphs into a file.

You can look at the structural imbalance as a reference:
```
if show:
    plt.show()
else:
    filename = 'structural imbalance {} {}.png'.format(sampler_type, region)
    plt.savefig(filename, facecolor='white')
```
I hope that helps.

Best Regards,
Tanjid
0

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