Abstract
In this paper we propose a new algorithm to solve large Toeplitz systems. It consists of two steps. First, we embed the system of order N into a semi-infinite Toeplitz system and compute the first N components of its solution by an algorithm of complexity O(N log2 N). Then we check the accuracy of the approximate solution, by an a posteriori criterion, and update the inaccurate components by solving a small Toeplitz system. The numerical performance of the method is then compared with the conjugate gradient method, for 3 different preconditioners. It turns out that our method is compatible with the best PCG methods concerning the accuracy and superior concerning the execution time.
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Dedicated to Israel Gohberg on the occasion of his 75th birthday
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Rodriguez, G., Seatzu, S., Theis, D. (2005). An Algorithm for Solving Toeplitz Systems by Embedding in Infinite Systems. In: Gohberg, I., et al. Recent Advances in Operator Theory and its Applications. Operator Theory: Advances and Applications, vol 160. Birkhäuser Basel. https://doi.org/10.1007/3-7643-7398-9_19
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DOI: https://doi.org/10.1007/3-7643-7398-9_19
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