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Best way to plot graph

asked 2011-07-14 10:23:01 -0500

Eugene gravatar image

Hello!

Could you pleas advise me the best way to plot graph with cycles and make it looks like tree? Here is the sample picture of result I'd like to have:

image description

Plot on this pictures have 'layers', is there any chance to get something like this in Sage? I tried this:

t = DiGraph()
t.add_edge((0,1))
t.add_edge((0,2))
t.add_edge((0,3))
t.add_edge((0,4))

t.add_edge((4,9))
t.add_edge((3,9))
t.add_edge((2,9))
t.add_edge((1,9))

t.plot()

but the result is far from desired.

Thanks.

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answered 2011-07-14 12:20:09 -0500

parzan gravatar image

updated 2011-07-14 23:35:48 -0500

You can use:

t.plot(pos=t.layout_acyclic())

If you get arrows pointing up it means you don't have the dot2tex package installed (you can check this with sage.graphs.dot2tex_utils.have_dot2tex()), and sage does the positioning itself (by calling t.layout_acyclic_dummy()). Just run install_package('dot2tex-2.8.7-2') (perhaps the version number will change one day, type optional_packages() to see all packages available).

You can also manually flip sage's positioning:

l = t.layout_acyclic_dummy()
t.plot(pos=dict([[v,[l[v][0],-l[v][1]]] for v in t.vertices()]))

or rotate it like in the image in the question:

l = t.layout_acyclic_dummy()
t.plot(pos=dict([[v,[l[v][1],l[v][0]]] for v in t.vertices()]))
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Comments

This method works great, thank you! But is it possible somehow change orientation of the result tree-like graph? Something like tree_orientation='down' effect for actual tree.

Eugene gravatar imageEugene ( 2011-07-14 18:32:00 -0500 )edit

Ok, I checked what happens and updated my answer.

parzan gravatar imageparzan ( 2011-07-14 22:52:15 -0500 )edit

Thank you! This solution works perfectly correct.

Eugene gravatar imageEugene ( 2011-07-15 07:16:19 -0500 )edit

Glad to help.

parzan gravatar imageparzan ( 2011-07-15 11:57:46 -0500 )edit

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Asked: 2011-07-14 10:23:01 -0500

Seen: 358 times

Last updated: Jul 14 '11