Ordering edge names in Digraph

Question

Antoine Lunaire 2020-9-6

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https://ww2.mathworks.cn/matlabcentral/answers/589645-ordering-edge-names-in-digraph

评论： Antoine Lunaire 2020-9-8

I have this simple code just to make the question easy

s = [1 1 1 1 2 2 3 1 1];
t = [1 1 2 4 3 4 4 1 1];
G = digraph(s,t);
G.Nodes.Name = {'First', 'Second', 'Third' ,'Fourth'}';
G.Edges.Power = {'loop1' 'loop2' 'Hi' 'Hello' 'Bonjour' 'Welcome' 'Salut' 'loop3' 'loop4'}';
figure;
p = plot(G,'EdgeLabel',G.Edges.Power);

And this gives me the following graph.

My problem is I receive the the order of the source and destination vectors in a similar way to the given above, where I can not control the selfloops of (1,1). Some of them comes at the begining, some in the middel and some at the end. I want to give the same order of Edges.Power to the same order of the edges are defined by s,t. In other words, all selfloops around vertix 1(First) should be 'loop1' , 'loop2', 'loop3', loop4'.

Any help will be highly appreciated and thanks in advance.

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Antoine Lunaire 2020-9-8

Thank you very much, this was very easy explained and very helpful

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Answer 1

Christine Tobler 2020-9-8

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https://ww2.mathworks.cn/matlabcentral/answers/589645-ordering-edge-names-in-digraph#answer_491575

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The edges are reordered in the graph constructor, but it looks like the Power variable you're assigning is in the same order as the s, t vectors being passed in. You can pass the Power vector into the constructor, this way it will be reordered together with s and t:

s = [1 1 1 1 2 2 3 1 1];
t = [1 1 2 4 3 4 4 1 1];
nodeNames = {'First', 'Second', 'Third' ,'Fourth'}';
Power = {'loop1' 'loop2' 'Hi' 'Hello' 'Bonjour' 'Welcome' 'Salut' 'loop3' 'loop4'}';
G = digraph(s, t, table(Power), nodeNames);
plot(G, 'EdgeLabel', G.Edges.Power)