Create a graph, and then determine the edge index for the (1,2) and (3,5) edges.

s = [1 1 2 2 2 3 3 3]; t = [2 3 3 4 5 6 7 5]; G = graph(s,t)

G = graph with properties: Edges: [8x1 table] Nodes: [7x0 table]

idxOut = findedge(G,[1 3],[2 5])

idxOut =2×11 - 6

idxOutcontains the row index intoG.Edges.EndNodesfor each specified edge.

Create a graph, and then determine the end nodes of all edges in the graph.

s = {'a''a''b''b''c''c'}; t = {'b''c''d''e''f''g'}; G = graph(s,t); G.Edges

ans=6×1 tableEndNodes ______________ {'a'} {'b'} {'a'} {'c'} {'b'} {'d'} {'b'} {'e'} {'c'} {'f'} {'c'} {'g'}

[sOut,tOut] = findedge(G)

sOut =6×11 1 2 2 3 3

兜售=6×12 3 4 5 6 7

Create a graph, and then determine the end nodes for the edges whose indices are3and7.

s = [1 1 1 1 2 2 3 3 4 4]; t = [2 3 4 5 6 7 8 9 10 11]; G = digraph(s,t)

G = digraph with properties: Edges: [10x1 table] Nodes: [11x0 table]

[sOut,tOut] = findedge(G,[3 7])

sOut =2×11 3

兜售=2×14 8

Create a graph.

s = [1 1 2 3]; t = [2 3 3 4]; weights = [10 20 30 40]; G = graph(s,t,weights)

G = graph with properties: Edges: [4x2 table] Nodes: [4x0 table]

Find the weight of the (1,3) edge, usingfindedgeto retrieve the index.

G.Edges.Weight(findedge(G,1,3))

ans = 20

Usefindedgeto change the weights of several multigraph edges.

Create and plot a multigraph. This graph has two edges between node 2 and node 4.

s = [1 1 2 3 2 2]; t = [2 3 3 4 4 4]; weights = [10 20 30 40 10 10]; G = graph(s,t,weights); plot(G,'EdgeLabel',G.Edges.Weight)

Change the weights of the edges between nodes (3,2) and (2,4). Specify two outputs tofindedgeto get the end-node indices,m. This output is useful when there are multiple edges between two nodes, sinceidxOutcan have more elements than the number of node pairs insandt. The edgeidxOut(1) = 3connects the node pair(s(1),t(1)) = (3,2), and the edgesidxOut(2) = 4andidxOut(3) = 5connect the edge(s(2),t(2)) = (2,4).

s = [3 2]; t = [2 4]; w = [1 4]; [idxOut, m] = findedge(G, s, t)

idxOut =3×13 4 5

m =3×11 2 2

G.Edges.Weight(idxOut) = w(m); plot(G,'EdgeLabel',G.Edges.Weight)