Error using matlab.gra​phics.char​t.primitiv​e.GraphPlo​t/highligh​t>checkEdg​esNodePair

I've been trying to add colors to my graph's edges, but I got this error and I have no idea how to solve it:

Error using matlab.graphics.chart.primitive.GraphPlot/highlight>checkEdgesNodePair

s and t must specify edges in the graph.

Error in matlab.graphics.chart.primitive.GraphPlot/highlight

Error in asd (line 10)

highlight(p,[1 1 1 1 1],[1 2 3 4 6],'EdgeColor','r')

clear all
close all
clc

s = {'a' 'a' 'a' 'a' 'a' 'b' 'b' 'b' 'b' 'c' 'c' 'c' 'd' 'd' 'd' 'e' 'e' 'e' 'e' 'f' 'f' 'f' 'f' 'g' 'g' 'g' 'g' 'g'};
t = {'a' 'b' 'c' 'd' 'f' 'a' 'c' 'd' 'g' 'b' 'c' 'e' 'c' 'a' 'b' 'e' 'c' 'b' 'g' 'a' 'b' 'd' 'e' 'g' 'a' 'c' 'd' 'e'};
G = digraph(s,t);
labels = {'a/5' 'a/5' 'a/5' 'a/5' 'a/5' 'b/4' 'b/4' 'b/4' 'b/4' 'c/3' 'c/3' 'c/3' 'd/3' 'd/3' 'd/3' 'e/4' 'e/4' 'e/4' 'e/4' 'f/4' 'f/4' 'f/4' 'f/4' 'g/5' 'g/5' 'g/5' 'g/5' 'g/5'};
p = plot(G,'Layout','layered','EdgeLabel',labels);
highlight(p,[1 1 1 1 1],[1 2 3 4 6],'EdgeColor','r')
highlight(p,[2 2 2 2],[1 2 4 7],'EdgeColor','g')
highlight(p,[3 3 3],[2 3 5],'EdgeColor','b')
highlight(p,[4 4 4],[1 2 3],'EdgeColor','c')
highlight(p,[5 5 5 5],[2 3 5 7],'EdgeColor','m')
highlight(p,[6 6 6 6],[1 2 4 5],'EdgeColor','y')
highlight(p,[7 7 7 7 7],[7 1 3 4 5],'EdgeColor','k')
title('PageRank Hivatkozások közti átmenet')

Answer 1

[Steven Lord]

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

G = 
  digraph with properties:

    Edges: [28×1 table]
    Nodes: [7×1 table]

successors(G, 1)

ans = 5×1

1 2 3 4 5

findedge(G, 1, 6)

ans = 0

There is no edge in G from node 1 to node 6 as you can see from both the successors call and the findedge call.

G.Nodes.Name

ans = 7×1 cell array
    {'a'}
    {'b'}
    {'c'}
    {'d'}
    {'f'}
    {'g'}
    {'e'}

You may have intended node 6 to be 'f' but it is 'g' instead. If you want them in that order, say so when you construct the digraph.

G2 = digraph(s, t, [], {'a','b','c','d','e','f','g'})

G2 = 
  digraph with properties:

    Edges: [28×1 table]
    Nodes: [7×1 table]

G2.Nodes.Name

ans = 7×1 cell array
    {'a'}
    {'b'}
    {'c'}
    {'d'}
    {'e'}
    {'f'}
    {'g'}

findedge(G2, 1, 6) % There is an edge between 'a' and 'f'

ans = 5

[Steven Lord]

Another option I forgot to mention earlier would be to use node names instead of node indices in your highlight calls.

s = {'a' 'a' 'a' 'a' 'a' 'b' 'b' 'b' 'b' 'c' 'c' 'c' 'd' 'd' 'd' 'e' 'e' 'e' 'e' 'f' 'f' 'f' 'f' 'g' 'g' 'g' 'g' 'g'};
t = {'a' 'b' 'c' 'd' 'f' 'a' 'c' 'd' 'g' 'b' 'c' 'e' 'c' 'a' 'b' 'e' 'c' 'b' 'g' 'a' 'b' 'd' 'e' 'g' 'a' 'c' 'd' 'e'};
G = digraph(s,t);
h = plot(G, 'Layout', 'circle');
highlight(h, ["a", "a"], ["f", "c"])

[Eugen Fekete]

This option even makes understanding it easier. Thanks for the helps!