Info : T is actually a triangulation -list of triangles-, in which each index corresponding to the row index of a vertex in another list -a vertices list-, it is a widely used technique used to store and write triangular meshes in mesh processing. Here below the example is a tetrahedron -4 facets-.
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Back to basics 14 - Keywords
Arrange vector in ascending order
Matrix of almost all zeros, except for main diagonal
"Power matrix" of two vectors
Query a vertex neighbors
Query edges list
Query every vertices neighbor indices
Remove duplicated vertices
Find edges from a vertex
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