triangulation_boundary_edges, an Octave code which analyzes the triangulation of a region, identifies the edges that form the boundaries, organizes the boundary edges into one or more connected components, and writes a file describing the components and the sequence of boundary edges.
Either a 3-node or 6-node triangulation may be used.
triangulation_boundary_edges ( 'prefix' )where prefix is the common filename prefix:
The computer code and data files described and made available on this web page are distributed under the MIT license
triangulation_boundary_edges is available in a MATLAB version and an Octave version.
triangulation_boundary_edges_test
mesh_boundary, an Octave code which is given a mesh of a 2D region, formed by polygonal elements, and determines a sequence of pairs of polygonal vertices that define the boundary of the region.
mesh_to_xml, an Octave code which reads information defining a 1d, 2d or 3d mesh, namely a file of node coordinates and a file of elements defined by node indices, and creates a corresponding xml file for input to dolfin() or fenics().
triangulation, an Octave code which carries out various operations on order 3 ("linear") or order 6 ("quadratic") triangulations.
triangulation_boundary_nodes, an Octave code which reads data defining a triangulation, determines which nodes lie on the boundary, and writes their coordinates to a file.
triangulation_corner, an Octave code which patches triangulations so that no triangle has two sides on the boundary.
triangulation_delaunay_discrepancy, an Octave code which measures the amount by which a triangulation fails the local delaunay test;
triangulation_display, an Octave code which displays the nodes and elements of a triangulation on the MATLAB graphics screen;
triangulation_histogram, an Octave code which computes histograms of data over a triangulation.
triangulation_l2q, an Octave code which reads data defining a 3-node triangulation and generates midside nodes and writes out the corresponding 6-node triangulation.
triangulation_mask, an Octave code which takes an existing triangulation and deletes triangles and their corresponding nodes as requested by the user.
triangulation_order3, a data directory which contains a description and examples of order 3 triangulations.
triangulation_order6, a data directory which contains a description and examples of order 6 triangulations.
triangulation_orient, an Octave code which reads data defining a triangulation, makes sure that every triangle has positive orientation, and if not, writes a corrected triangle file.
triangulation_plot, an Octave code which reads data defining a triangulation and creates a postscript image of the nodes and triangles.
triangulation_q2l, an Octave code which reads data defining a 6-node triangulation, and subdivides each triangle into 4 3-node triangles, writing the resulting triangulation to a file.
triangulation_quad, an Octave code which estimates the integral of a function over a triangulated region.
triangulation_quality, an Octave code which reads data defining a triangulation and computes a number of quality measures.
triangulation_rcm, an Octave code which reads data defining a triangulation, determines an ordering of the nodes that will reduce the bandwidth of the adjacency matrix, and writes the new triangulation information to a file.
triangulation_refine, an Octave code which reads data defining a triangulation, replaces each triangle by four congruent smaller ones, and writes the new triangulation information to a file.
triangulation_triangle_neighbors, an Octave code which reads data defining a triangulation, determines the neighboring triangles of each triangle, and writes that information to a file.