Eigenvalue clustering of coefficient matrices in the iterative stride reductions for linear systems
Eigenvalue clustering of coefficient matrices in the iterative stride reductions for linear systems
复制标题
线性系统迭代步幅缩减中系数矩阵的特征值聚类
DOI:
10.1016/j.camwa.2015.11.022
复制
发表时间:
2016
期刊:
影响因子:
--
通讯作者:
Masashi Iwasaki and Yoshimasa Nakamura
中科院分区:
文献类型:
--
作者:
Munehiro Nagata;Masatsugu Hada;Masashi Iwasaki and Yoshimasa Nakamura
Solvers for linear systems with tridiagonal coefficient matrices sometimes employ direct methods such as the Gauss elimination method or the cyclic reduction method. In each step of the cyclic reduction method, nonzero offdiagonal entries in the coefficient matrix move incrementally away from diagonal entries and eventually vanish. The steps of the cyclic reduction method are generalized as forms of the stride reduction method. For example, the 2-stride reduction method coincides with the 1st step of the cyclic reduction method which transforms tridiagonal linear systems into pentadiagonal systems. In this paper, we explain arbitrary-stride reduction for linear systems with coefficient matrices with three nonzero bands. We then show that arbitrary-stride reduction is equivalent to a combination of 2-stride reduction and row and column permutations. We thus clarify eigenvalue clustering of coefficient matrices in the step-by-step process of the stride reduction method. We also provide two examples verifying this property.
登录
查看更多内容
影响因子:
2.9
作者:
R. Sweet
通讯作者:
R. Sweet
DOI:
--
发表时间:
2010
期刊:
Intern. J. of Computer Math
影响因子:
--
作者:
Tan Wang;Masashi Iwasaki and Yoshimasa Nakamura
通讯作者:
Masashi Iwasaki and Yoshimasa Nakamura
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
DOI:
10.1016/0167-8191(89)90014-8
发表时间:
1987
期刊:
Parallel Comput.
影响因子:
--
作者:
Efstratios Gallopoulos;Y. Saad
通讯作者:
Y. Saad