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Items for "data-sparse approximate inverse"

Data-sparse elliptic operator inverse based on explicit approximation to the Green function

A class of data-sparse hierarchical matrices (?-matrices) allows to approximate nonlocal (integral) operators with almost linear complexity [22 – 31]...

Keywords: Elliptic equations, BEM, FEM, data-sparse approximate inverse, hierarchical matrices

06/2003 | Journal of Numerical Mathematics, Walter de Gruyter
Hierarchical matrix approximation to Green's function via boundary concentrated FEM

In the preceding paper [24], a method is described for an explicit hierarchical (?-matrix) approximation to the inverse of an elliptic differential operator with piecewise constant/smooth coefficients in ?d ...

Keywords: Elliptic equations, BEM, FEM, data-sparse approximate inverse, hierarchical matrices, boundary concentrated hp-FEM

09/2003 | Journal of Numerical Mathematics, Walter de Gruyter