Communications on Applied Mathematics and Computation ›› 2025, Vol. 7 ›› Issue (2): 562-588.doi: 10.1007/s42967-023-00364-9

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A Low-Rank Global Krylov Squared Smith Method for Solving Large-Scale Stein Matrix Equation

Song Nie1, Hua Dai1   

  1. School of Mathematics, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, Jiangsu, China
  • Received:2023-10-08 Revised:2023-12-18 Accepted:2023-12-19 Online:2025-06-20 Published:2025-04-21
  • Supported by:
    The work is supported by the National Natural Science Foundation of China under grant No.11571171. The authors are very grateful to the anonymous referees for their useful comments and suggestions which greatly improved the representation of this paper.

Abstract: This paper deals with the numerical solution of the large-scale Stein and discrete-time Lyapunov matrix equations. Based on the global Arnoldi process and the squared Smith iteration, we propose a low-rank global Krylov squared Smith method for solving largescale Stein and discrete-time Lyapunov matrix equations, and estimate the upper bound of the error and the residual of the approximate solutions for the matrix equations. Moreover, we discuss the restarting of the low-rank global Krylov squared Smith method and provide some numerical experiments to show the efficiency of the proposed method.

Key words: Stein matrix equation, Lyapunov matrix equation, Squared Smith method, Global Krylov subspace, Restart technique

CLC Number: