1997
DOI: 10.1090/s0025-5718-97-00844-2
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Implicitly restarted Arnoldi with purification for the shift-invert transformation

Abstract: Abstract. The need to determine a few eigenvalues of a large sparse generalised eigenvalue problem Ax = λBx with positive semidefinite B arises in many physical situations, for example, in a stability analysis of the discretised Navier-Stokes equation. A common technique is to apply Arnoldi's method to the shift-invert transformation, but this can suffer from numerical instabilities as is illustrated by a numerical example. In this paper, a new method that avoids instabilities is presented which is based on ap… Show more

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Cited by 50 publications
(48 citation statements)
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“…This implies that it may be difficult for Krylov methods to find the wanted eigenvalue(s) (see also the experiments with Matlab's eigs and an implementation of Krylov-Schur [29] in Section 4). Second, approaches based on matrix transformations (see, e.g., [18] for an overview, and, for instance, [19]) are not applicable: shift-and-invert Arnoldi methods are infeasible as these require a known shift (target); in our problems we do not have a shift beforehand. Third, and most importantly, our method is able to make effective use of the action with sparser (and hence cheaper) commuting matrices in the inner iterations: it computes the eigenvalues of the sparse matrix A p while using one of the much sparser matrices A x 1 , .…”
Section: A Jacobi-davidson Type Methods For Commuting Matricesmentioning
confidence: 99%
“…This implies that it may be difficult for Krylov methods to find the wanted eigenvalue(s) (see also the experiments with Matlab's eigs and an implementation of Krylov-Schur [29] in Section 4). Second, approaches based on matrix transformations (see, e.g., [18] for an overview, and, for instance, [19]) are not applicable: shift-and-invert Arnoldi methods are infeasible as these require a known shift (target); in our problems we do not have a shift beforehand. Third, and most importantly, our method is able to make effective use of the action with sparser (and hence cheaper) commuting matrices in the inner iterations: it computes the eigenvalues of the sparse matrix A p while using one of the much sparser matrices A x 1 , .…”
Section: A Jacobi-davidson Type Methods For Commuting Matricesmentioning
confidence: 99%
“…Also see [21] [18] [10] [11] [16]. The idea is to apply an orthogonal transformation to H k that pushes the p desired Ritz values of H k to the principle p × p block.…”
Section: Implicit Restartingmentioning
confidence: 99%
“…A few remarks are in order. The starting vector is chosen so that it does not contain any components [15] in the null-space of B. The orthogonality of the m Arnoldi vectors is maintained at machine precision.…”
Section: Algorithmmentioning
confidence: 99%