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arXiv 2602.14786math.NAcs.NA
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新的随机全局广义最小余数(RGl-GMRES)方法

A randomized global GMRES method for matrix equations

Mohammed VI Polytechnic University (UM6P)(穆罕默德六世理工大学);Southwestern University of Finance and Economics(西南财经大学)

Achraf Badahmane, Issa Ezzagouri, Xian-Ming GU

AI总结:

本文提出了一种新的随机全局广义最小余数方法,通过引入矩阵草图技术,有效求解大规模线性系统,实验表明其在处理多右端向量问题时具有竞争力。

摘要:

在本文中,我们开发了一种新的随机全局广义最小余数(RGlGMRES)算法,以高效地求解具有多个右端向量的大规模线性系统。所提出的方法基于最近开发的随机全局Gram Schmidt过程,在其中使用了近似高维矩阵的精确Frobenius内积的草图Frobenius内积。我们给出了随机全局GMRES方法在多个线性系统中的新收敛结果。在系数矩阵A可对角化的场合,我们推导了随机Frobenius范数残差的新上界。在本文中,我们研究如何将矩阵草图引入该算法。这允许我们在算法的主要步骤之一中减少问题的维度。为了验证该方法的有效性和实用性,我们进行了若干数值实验,结果表明,我们的RGl-GMRES方法在求解具有多个右端向量的大规模问题时与GlGMRES方法具有竞争力。

英文摘要:

In this paper, we develop a new Randomized Global Generalized Minimum Residual (RGlGMRES) algorithm for efficiently computing solutions to large scale linear systems with multiple right hand sides. The proposed method builds on a recently developed randomized global Gram Schmidt process, in which sketched Frobenius inner products are employed to approximate the exact Frobenius inner products of high dimensional matrices. We give some new convergence results of the RGlGMRES method for multiple linear systems. In the case where the coefficient matrix A is diagonalizable, we derive new upper bounds for the randomized Frobenius norm of the residual. In this paper, we study how to introduce matrix sketching in this algorithm. It allows us to reduce the dimension of the problem in one of the main steps of the algorithm. We also show how to apply the RGlGMRES method for solving the Lyapunov matrix equation. To validate the effectiveness and practicality of this approach, we conduct several numerical experiments, which demonstrate that our RGlGMRES method is competitive with the global GMRES method for solving large scale multiple linear systems and Lyapunov matrix equation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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