Only dash some edges in a graph?

[Ursula Whitcher]

Is it possible to display a directed graph in Sage so that only some of the edges are dashed?  I found the edge_style option, but that seems to apply to all of the edges simultaneously.

UAW

[kcrisman]

I don't know but that is a great question!

[P Purkayastha]

Perhaps you can try using different colors instead of different line styles.  There is an option called 'color_by_label', where you can set a label for some edges and color them accordingly.

[Ursula Whitcher]

On 5/30/2014 11:47 PM, P Purkayastha wrote:
> Perhaps you can try using different colors instead of different line
> styles. There is an option called 'color_by_label', where you can set a
> label for some edges and color them accordingly.

I am aware of this option, but I want to be able to color AND dash lines.

--Ursula.

[P Purkayastha]

Created this ticket http://trac.sagemath.org/ticket/16421

[Tom Boothby]

If you partition the edges into several graphs, you can sum their
plots. Just remember axes=false when you show().

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[Tom Boothby]

g = Graph([(i,(i+1)%6,i%2) for i in range(6)])
h = Graph([(i,(i+2)%6,i%2) for i in range(6)])
k = Graph([(i,(i+3)%6,i%2) for i in range(6) if i<3])
pos = graphs.CycleGraph(6).get_pos()
g.set_pos(pos)
h.set_pos(pos)
k.set_pos(pos)
p = g.plot(color_by_label={0:'blue', 1:'red'}, edge_style='dashed',
vertex_labels=False,vertex_size=0)
p+= h.plot(color_by_label={0:'blue', 1:'green'},
vertex_labels=False,vertex_size=0)
p+= k.plot(color_by_label={0:'brown', 1:'black'}, edge_style='dotted')
p.show(axes=False)

[Ursula Whitcher]

On 6/1/2014 3:49 PM, Tom Boothby wrote:
> g = Graph([(i,(i+1)%6,i%2) for i in range(6)])
> h = Graph([(i,(i+2)%6,i%2) for i in range(6)])
> k = Graph([(i,(i+3)%6,i%2) for i in range(6) if i<3])

[...]

Nice. Thanks!

--Ursula.