edges

Load 2-D triangulation data and create a triangulation representation.

P = [2.5 8.0; 6.5 8.0; 2.5 5.0; 6.5 5.0; 1.0 6.5; 8.0 6.5];
T = [5 3 1; 3 2 1; 3 4 2; 4 6 2];
TR = triangulation(T,P);

Find the starting and ending vertex identification numbers of the edges in the triangulation.

E = edges(TR)

E = 9×2

     1     2
     1     3
     1     5
     2     3
     2     4
     2     6
     3     4
     3     5
     4     6

Define the coordinates of the first point in the triangulation. Then define the coordinates of the three vertices sharing an edge with the first point (the second, third, and fifth).

startVert = TR.Points(1,:);
endVert = TR.Points([2 3 5],:);

Plot the triangulation. Plot the first vertex in green, and plot the connecting points along an edge in red.

triplot(TR)
hold on
plot(startVert(1,1),startVert(1,2),'g.','MarkerSize',20)
plot(endVert(:,1),endVert(:,2),'r.','MarkerSize',20)
hold off