triangulation_t3_to_t4_test, a Fortran90 code which calls triangulation_t3_to_t4(), which reads information describing a triangulation of a set of points using 3-node "T3" triangles, and creates a 4-node "T4" triangulation.
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triangulation_t3_to_t4, a Fortran90 code which reads information about a 3-node triangulation and creates data defining a corresponding 4-node triangulation (vertices + centroid);
EXAMPLE is a simple set of example data: