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How can we access individual edges in a Graph ?

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charu shree
charu shree 2023-4-21
回答： Steven Lord 2023-4-21
Hello all, I have the following Graph:
I know that with G.Edges , we can know the edges.
But I am not getting, how can I access individual edge of this Graph.
Any help in this regard will be highly appreciated.
sr = [1,2,2,2,3,3,3,4,5];
ta = [2,3,6,8,6,4,7,6,6];
G = graph(sr,ta);
plot(G)
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Steven Lord
Steven Lord 2023-4-21
Ran in:
I'd be careful asking for say "edge 8" because graph and digraph reserve the right to reorder the edges array if you insert or delete edges.
g = graph([1 2 3], [2 3 1])
g =
graph with properties: Edges: [3×1 table] Nodes: [3×0 table]
g.Edges
ans = 3×1 table
EndNodes ________ 1 2 1 3 2 3
originalEdge3 = g.Edges{3, :}
originalEdge3 = 1×2
2 3
g = addedge(g, 2, 1)
g =
graph with properties: Edges: [4×1 table] Nodes: [3×0 table]
newEdge3 = g.Edges{3, :}
newEdge3 = 1×2
1 3
originalEdge3 and newEdge3 are not the same edge. Before you ask no, there is no way to stop graph or digraph from doing this reordering.
If you want to ask if there is an edge between a source and target node, use findedge. Call it right before you need to access the edge, as adding or removing an edge can change the output of findedge as you saw above.
whichEdge = findedge(g, 2, 3)
whichEdge = 4
g.Edges(whichEdge, :)
ans = table
EndNodes ________ 2 3

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