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Hybrid cross approximation of integral operators

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Abstract

The efficient treatment of dense matrices arising, e.g., from the finite element discretisation of integral operators requires special compression techniques. In this article we use the -matrix representation that approximates the dense stiffness matrix in admissible blocks (corresponding to subdomains where the underlying kernel function is smooth) by low-rank matrices. The low-rank matrices are assembled by a new hybrid algorithm (HCA) that has the same proven convergence as standard interpolation but also the same efficiency as the (heuristic) adaptive cross approximation (ACA).

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Correspondence to Steffen Börm.

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Börm, S., Grasedyck, L. Hybrid cross approximation of integral operators. Numer. Math. 101, 221–249 (2005). https://doi.org/10.1007/s00211-005-0618-1

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  • DOI: https://doi.org/10.1007/s00211-005-0618-1

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