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Two fast algorithms for finding the solution of the lower Hessenberg quasi-Toeplitz linear system from Markov chain
Yaru Fu1,2, Xiaoyu Jiang3, Yanpeng Zheng4
1School of Mathematics and Statistics, Taiyuan Normal University, Jinzhong, 030619, China.
Abstract:
We present two fast algorithms for finding the solution of the nonsingular lower Hessenberg quasi-Toeplitz linear system stem from Markov chain. And we confirm the complexity of these two algorithms is both O[Formula: see text] based on the fact that a lower Hessenberg quasi-Toeplitz matrix can be written as the sum of a Toeplitz matrix and a rank-one matrix, such that the fast solver involves O[Formula: see text] operators for solving the Toeplitz linear system can be adopted. Finally, numerical results prove the superiority and accuracy of our algorithms by comparing the values of residual and CPU time with existing algorithms.
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