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How to adjust the size of graphs in `graphs_list.show_graphs`

asked 2022-12-04 06:27:05 +0100

licheng gravatar image

updated 2022-12-04 08:32:29 +0100

The following code is used to find some cospectral graphs. I want to show it in pairs with a for-loop. But each line of the graphs looks too small and there is too much space between each pair of graphs. I want to show them in a beautiful way.

g=graphs.cospectral_graphs(6)
l=len(g)
for i in range(l): 
    print("The",i+1, "th pair cospectral graphs")
    graphs_list.show_graphs(g[i],vertex_size=200,figsize=100,vertex_labels=True,vertex_color='orange')

image description

I tried another method. I put a frame around each graph (like the blue border above). But the frame for each graph is not is inconsistent (see in the following picture). (The reason for putting a frame around each graph is to better distinguish the different graphs)

g=graphs.cospectral_graphs(6)
l=len(g)
for i in range(l):               
    G=[plot(g[i][j],graph_border=True,edge_thickness=2, vertex_size=200,vertex_labels=True,vertex_color='orange') for j in range(len(g[i]))]
    print("The",i+1, "th pair cospectral graphs:")
    graphics_array(G).show(figsize=5)

image description

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Comments

1

This question relates to the presentation of the result computed by Sage, and depends on the interface you are using. Therefore, you should aim your question :

  • to a Jupyter forum/mailing list if you use the Jupyter notebook

  • to a LaTeX forum/mailing list if you aim to produce a PDF

  • etc...

You may also work along the lines of graphics_array([[v.plot() for v in u] for u in graphs.cospectral_graphs(6)]) which leaves you entirely responsible for the formatting...

HTH

Emmanuel Charpentier gravatar imageEmmanuel Charpentier ( 2022-12-05 08:32:46 +0100 )edit

1 Answer

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answered 2023-07-04 17:41:17 +0100

slelievre gravatar image

Not sure how to customize the graphics produced by graphs_list.show_graphs.

As you figured out, an alternative approach is to

  • use graphics_array
  • specify some options to the plot method of each graph

Here are some options that will hopefully work for you.

G = graphs.cospectral_graphs(6)
opt = dict(vertex_size=200, vertex_labels=True, vertex_color='orange',
           graph_border=True, layout='circular', xmin=-1.5, xmax=1.5)
n_st = {1: 'st', 2: 'nd', 3: 'rd'}
n_th = lambda n: n_st[n % 10] if n % 10 in (1, 2, 3) and (n % 100) // 10  - 1 else 'th'
nth = lambda n: f'{n}{n_th(n)}'
for n, gg in enumerate(G, start=1):
    print(f"The {nth(n)} pair of cospectral graphs")
    graphics_array([g.plot(**opt) for g in gg]).show()

Cospectral graphs

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Asked: 2022-12-04 06:27:05 +0100

Seen: 171 times

Last updated: Jul 04 '23