摘要
近年来,一些作者提出了很多求解一类特殊的 3 ×3 块鞍点系统的有效选代方法。为了便于评估这些数值算法的强稳定性,本文对这种类型的 3 ×3 块鞍点系统进行了结构向后误差分析,并给出了结构向后误差的可计算的具体表达式。数值实验表明,该表达式可用于检验实际算法的稳定性。
In recent years, a number of authors have proposed effcient iteration methods for solving a special class of block 3×3 saddle point systems. In order to evaluate the strong stability of these numerical algorithms, this paper perform the structured backward error analysis for this type of block 3 ×3 saddle point system and present an explicit and computable formula for the structured backward error. Numerical example show that the expressions are useful for testing the stability of practical algorithms.
出处
《理论数学》
2023年第2期265-284,共20页
Pure Mathematics
