Hi Nelson,
You may do like this:
%creating first graph
s = [1 1 2 3 3 3 4 4 5 6 7 7 8];
t = [2 3 6 4 6 8 5 8 9 7 8 9 9];
G = graph(s,t);
%plotting
h = plot(G);
%creating second graph
s1 = [3 3 6 7 7];
t1 = [6 8 7 8 9];
G1 = graph(s1,t1);
%highlighting second graph with red color edges and linewith 1.5
highlight(h,G1,'EdgeColor','r','LineWidth',1.5);
You may look at this documentation for further
Hope this Helps!
