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edges

Triangulation edges

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Syntax

E = edges(TR)

Description

E = edges(TR) returns the triangulation edges as a two-column matrix of vertex identification numbers. Vertex identifications are the row numbers of the triangulation vertices in TR.Points. The first column of E contains the starting vertex identification of each edge, and the second column contains the ending vertex identification.

example

Examples

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Open Live Script

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

Figure contains an axes object. The axes object contains 3 objects of type line. One or more of the lines displays its values using only markers

Input Arguments

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Triangulation representation, specified as a scalar triangulation or delaunayTriangulation object.

Data Types: triangulation | delaunayTriangulation

Extended Capabilities

Version History

Introduced in R2013a

See Also

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