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Approximate ILU Preconditioning for Shifted Systems
Author(s): 
Pages: 99-105
Year: Issue:  1
Journal: COMMUNICATION ON APPLIED MATHEMATICS AND COMPUTATION

Keyword:  位移方程组预条件处理不完全分解;
Abstract: 讨论位移方程组(A+αjI)x(αj)=b(αj,x(αi)),(i<j)的预条件处理,其中A是非对称矩阵,右端与其前面问题的解有关.我们利用A的不完全LU分解,对每个αj,利用渐近展开的方法,以很小的代价去构造位移矩阵A+αjI的预条件矩阵,相对于对每个位移矩阵去构造不完全LU分解的预条件矩阵,计算量大为减少.数值结果显示,这种预条件处理方法是有效的.
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