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- W2110003100 abstract "The field of values and pseudospectra are useful tools for understanding the behaviour of various matrix processes. To compute these subsets of the complex plane it is necessary to estimate one or two eigenvalues of a large number of parametrized Hermitian matrices; these computations are prohibitively expensive for large, possibly sparse, matrices, if done by use of the QR algorithm. We describe an approach based on the Lanczos method with selective reorthogonalization and Chebyshev acceleration that, when combined with continuation and a shift and invert technique, enables efficient and reliable computation of the field of values and pseudospectra for large matrices. The idea of using the Lanczos method with continuation to compute pseudospectra is not new, but in experiments reported here our algorithm is faster and more accurate than existing algorithms of this type." @default.
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- W2110003100 modified "2023-10-18" @default.
- W2110003100 title "Computing the field of values and pseudospectra using the Lanczos method with continuation" @default.
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- W2110003100 doi "https://doi.org/10.1007/bf01731925" @default.
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