Inexact rational Krylov subspace method for eigenvalue problems
Inexact rational Krylov subspace method for eigenvalue problems
复制标题
求解特征值问题的非精确有理 Krylov 子空间方法
DOI:
10.1002/nla.2437
复制
发表时间:
2022
影响因子:
4.3
通讯作者:
Xue, Fei
中科院分区:
文献类型:
--
作者:
Xu, Shengjie;Xue, Fei
An inexact rational Krylov subspace method is studied to solve large‐scale nonsymmetric eigenvalue problems. Each iteration (outer step) of the rational Krylov subspace method requires solution to a shifted linear system to enlarge the subspace, performed by an iterative linear solver for large‐scale problems. Errors are introduced at each outer step if these linear systems are solved approximately by iterative methods (inner step), and they accumulate in the rational Krylov subspace. In this article, we derive an upper bound on the errors introduced at each outer step to maintain the same convergence as exact rational Krylov subspace method for approximating an invariant subspace. Since this bound is inversely proportional to the current eigenresidual norm of the target invariant subspace, the tolerance of iterative linear solves at each outer step can be relaxed with the outer iteration progress. A restarted variant of the inexact rational Krylov subspace method is also proposed. Numerical experiments show the effectiveness of relaxing the inner tolerance to save computational cost.
DOI:
10.1007/978-1-4613-9353-5_10
发表时间:
1994
期刊:
--
影响因子:
--
作者:
Axel Ruhe
通讯作者:
Axel Ruhe
DOI:
10.1137/080716281
发表时间:
2009-08
期刊:
SIAM J. Matrix Anal. Appl.
影响因子:
--
作者:
M. Freitag;A. Spence
通讯作者:
M. Freitag;A. Spence
DOI:
10.1137/1.9780898718003
发表时间:
2003-05
期刊:
--
影响因子:
--
作者:
Y. Saad
通讯作者:
Y. Saad