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- W1967985444 abstract "Abstract We generalize an augmented rounding error result that was proven for the symmetric Lanczos process in [C.C. Paige, An augmented stability result for the Lanczos Hermitian matrix tridiagonalization process, SIAM J. Matrix Anal. Appl. 31 (2010) 2347–2359], to the two-sided (usually unsymmetric) Lanczos process for tridiagonalizing a square matrix. We extend the analysis to more general perturbations than rounding errors in order to provide tools for the analysis of inexact and related methods. The aim is to develop a deeper understanding of the behavior of all these methods. Our results take the same form as those for the symmetric Lanczos process, except for the bounds on the backward perturbation terms (the generalizations of backward rounding errors for the augmented system). In general we cannot derive tight a priori bounds for these terms as was done for the symmetric process, but a posteriori bounds are feasible, while bounds related to certain properties of matrices would be theoretically desirable." @default.
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- W1967985444 date "2014-04-01" @default.
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- W1967985444 title "An augmented analysis of the perturbed two-sided Lanczos tridiagonalization process" @default.
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- W1967985444 doi "https://doi.org/10.1016/j.laa.2013.05.009" @default.
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