Short note on the mass matrix for Gauss–Lobatto grid points
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Short note on the mass matrix for Gauss-Lobatto grid points
The mass matrix for Gauss-Lobatto grid points is usually approximated by GaussLobatto quadrature because this leads to a diagonal matrix that is easy to invert. The exact mass matrix and its inverse are full. We show that the exact mass matrix and its inverse differ from the approximate diagonal ones by a simple rank-1 update (outer product). They can thus be applied to an arbitrary vector in O...
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ژورنال
عنوان ژورنال: Journal of Computational Physics
سال: 2015
ISSN: 0021-9991
DOI: 10.1016/j.jcp.2014.12.012