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• W2519541703 abstract "In this paper we consider a class of hierarchically rank structured matrices, including some of the hierarchical matrices occurring in the literature, such as hierarchically semiseparable (HSS) and certain H∈-matrices. We describe a fast O(rn log(n)) and stable algorithm to transform this hierarchical representation into a so-called unitary-weight representation, as introduced in an earlier work of the authors. This reduction allows the use of fast and stable unitaryweight routines (or by the same means, fast and stable routines for sequentially semiseparable (SSS) and quasiseparable representations, used by other authors in the literature), leading e.g. to direct methods for linear system solution and for the computation of all the eigenvalues of the given hierarchically rank structured matrix." @default.
• W2519541703 created "2016-09-23" @default.
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• W2519541703 creator A5031584827 @default.
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• W2519541703 date "2008-02-01" @default.
• W2519541703 modified "2023-09-23" @default.
• W2519541703 title "Transforming a hierarchical matrix into a unitary-weight representation" @default.
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