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Robert

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30 Jan 2009 Legende-Gauss-Lobatto nodes and weights Computes the Legendre-Gauss-Lobatto weights, nodes and vandermonde matrix. Author: Greg von Winckel

It's very good!
However, the problem can be rather tricky.
see the book 'Nodal discontinuous Galerkin methods', in 2D case, the transformation from 1D LGL points to 2D triangle LGL points is really complicated

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