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I'm trying to connect the nodes of graph g (Blue) with the nodes of graph h (Red).

so=[1 1 1 2 2 2 2 3 3 3 5];

ta=[2 3 4 3 4 5 6 6 7 5 7];

g=graph(so,ta);

p=plot(g);

x=p.XData;

y=p.YData;

z2=[0 0 0 0 0 0 0];

subplot(2,2,1);plot(g,'XData',x,'YData',y,'ZData',z2)

s=[1 1 1 2 2 3 3 3 3 4 4 5 5 ];

t=[2 5 6 3 4 7 4 5 6 7 5 7 6 ];

h=graph(s,t);

z=[-3 -3 -3 -3 -3 -3 -3];

hold on; subplot(2,2,1);plot(h,'XData',x,'YData',y,'ZData',z)

Is it something doable?

Thank you all for your continuous support!

Christine Tobler
on 18 Jan 2021

You could also add the edges of both graphs to one larger graph, and then use addedge to connect them. You would probably not get a clear separation visually of what used to be the first graph and the second graph this way, though.

so=[1 1 1 2 2 2 2 3 3 3 5];

ta=[2 3 4 3 4 5 6 6 7 5 7];

g=graph(so,ta);

p=plot(g);

x=p.XData;

y=p.YData;

z2=[0 0 0 0 0 0 0];

s=[1 1 1 2 2 3 3 3 3 4 4 5 5 ];

t=[2 5 6 3 4 7 4 5 6 7 5 7 6 ];

h=graph(s,t);

z=[-3 -3 -3 -3 -3 -3 -3];

gh = graph([so, s+7], [ta, t+7])

gh = addedge(gh, 2, 4+7)

plot(gh,'XData',[x, x],'YData',[y, y],'ZData',[z2, z2-3])

Christine Tobler
on 2 Feb 2021

Here are some small examples of what I meant

a)

graphs = {graph(zeros(10)};

for ii=1:10 % time steps

graphs{ii+1} = addedge(graphs{ii}, randi(10), randi(10));

end

This adds a random new edge to the graph at each timestep, and stores the graphs for each timestep in the cell array graphs.

b)

Let's say we have a graph representing a train network, where each edge is the connection between two places. If the dynamic is only about how many trains are running each edge per day, this can simply be stored in a matrix numTrains(edgeID, dayID). If a connection isn't used at all in a day, instead of removing the edge we can simply set that entry in numTrains to zero.

This only works for simpler cases, but in those cases it makes manipulating the data much easier than working with a cell array of graphs.

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