An Optimal Circulant Preconditioner for Toeplitz Systems

An Optimal Circulant Preconditioner for Toeplitz Systems
复制标题

DOI:
10.1137/0909051
复制
发表时间:
1988-07
期刊:
Siam Journal on Scientific and Statistical Computing
影响因子:
--
通讯作者:
T. Chan
T. Chan
中科院分区:
其他
文献类型:
--
作者:
T. Chan

文献摘要

被引文献

相似文献

对于给定的Toeplitz矩阵A,我们导出了一个最优循环预条件子C,它使${C-A}_F $最小化.它一般不同于早先由斯特朗提出的[“A proposal for Toeplitz matrix calculations,”Stud. Appl. Math.,74(1986),pp. 171-176],除非A本身是循环的。新的预条件是很容易计算,在初步的数值实验中表现得比斯特朗的预条件更好,在减少条件数的$C^{ - 1} A$和在聚类的频谱方面的团结。
Given a Toeplitz matrix A, we derive an optimal circulant preconditioner C in the sense of minimizing ${\|C - A\|}_F $. It is in general different from the one proposed earlier by Strang [“A proposal for Toeplitz matrix calculations,” Stud. Appl. Math., 74(1986), pp. 171–176], except in the case when A is itself circulant. The new preconditioner is easy to compute and in preliminary numerical experiments performs better than Strang's preconditioner in terms of reducing the condition number of $C^{ - 1} A$ and comparably in terms of clustering the spectrum around unity.