triangulation_boundary_edges_test, an Octave code which calls triangulation_boundary_edges(), which analyzes the triangulation of a region, identify the edges that form the boundaries, organize the boundary edges into one or more connected components, and write a file describing the components and the sequence of boundary edges.
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triangulation_boundary_edges, an Octave code which reads data defining a triangulation, determines which edges lie on the boundary, organizes them into connected components, and writes this information to a file.
ELBOW is a curved region, looking like an elbow, that lies inside the unit square. It is triangulated using order 3 triangles. There are 320 nodes and 568 triangles. There are 66 nodes on the boundary.
ELL is an L-shaped region, using 96 triangles and 65 nodes. It is triangulated using order 3 triangles.
LAKE is an irregular lake-shaped region with an "island", which means the boundary is made of two components. It is triangulated using order 3 triangles.