An algorithm for accelerated computation of DWTPer-based band preconditioners (Q5934374)
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scientific article; zbMATH DE number 1606687
| Language | Label | Description | Also known as |
|---|---|---|---|
| English | An algorithm for accelerated computation of DWTPer-based band preconditioners |
scientific article; zbMATH DE number 1606687 |
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An algorithm for accelerated computation of DWTPer-based band preconditioners (English)
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19 June 2001
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The discrete wavelet transform with permutations (DWTPer) is a centering version of the discrete wavelet transform that maps a band matrix into another band matrix. If a given matrix \(A\) is transformed to \(B= WAW^T\), then a preconditioner \(M\) is formed by setting to zero all elements of \(B\) lying outside a certain diagonal band. The authors present a new algorithm for computing DWTPer-based band preconditioner at a reduced cost.
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algorithm
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Newton-Krylov
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dense matrices
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GMRES
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wavelet-based preconditioner
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discrete wavelet transform with permutations
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band preconditioner
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