计算物理 ›› 1992, Vol. 9 ›› Issue (4): 445-447.

• 论文 • 上一篇    下一篇

关于PCG迭代矩阵特征值近似计算

茹向阳, 雷光耀   

  1. 中科院应用数学研究所, 北京 100080
  • 收稿日期:1992-02-24 出版日期:1992-12-25 发布日期:1992-12-25

NUMERICAL COMPUTATON FOR EXTREME EIGENVALES OF THE PCG ITERATIVE MATRIX

Ru Xiangyang, Lei Guangyao   

  1. Institute of Applied Mathematics, Academia Sinica, Beijing 100080
  • Received:1992-02-24 Online:1992-12-25 Published:1992-12-25

摘要: 对于预处理共轭梯度法,本文给出其迭代矩阵AM-1与三对角阵Bs之间的关系,并对Bs的特征值分布作了分析,进而得到关于AM-1特征值的一些性质。通过算例对两者的特征值及条件数进行了探讨。

关键词: 预处理共轭梯度(PCG), 三对角阵, 特征值

Abstract: This paper discusses the relationship between the iterative matrix AM-1 of the preconditioned conjugate gradient (PCG) and the tridiagonal matrix Bs obtained when the PCG iteration terminates. The distribution of eigenvalues of Bs is analysed and, consequently, several properties of eigenvalues of the PCG iterative matrix AM-1 are revealed.

Key words: preconditioned conjugate gradient, tridiagonal matrix, eigenvalue extreme eigenva