
doi: 10.1137/110851407
handle: 20.500.14243/129158 , 11568/156200 , 11381/2552445
In this paper a new O(N log3 N) solver for N × N Toeplitz-like systems, based on a divide and conquer technique, is presented. Similarly to the superfast algorithm MBA for the inversion of a Toeplitz-like matrix [R. R. Bitmead and B. D. O. Anderson, Linear Algebra Appl., 34 (1980), pp. 103?116; M. Morf, Proceedings of the IEEE International Conference on Acoustics, Speech, and Signal Processing, 1980, pp. 954?959], it exploits the displacement properties. In order to avoid the well-known numerical instability of the explicit inversion, the new algorithm relies on the triangular factorization and back-substitution formula for the system seen as a 2×2 block system with blocks of half size. This idea is the one used in [M. Stewart, SIAM J. Matrix Anal. Appl., 25 (2003), pp. 669?693] to improve the numerical stability of superfast methods based on the generalized Schur algorithm for positive definite Toeplitz matrices, but the algorithm we propose can be applied also to nonsymmetric Toeplitz-like systems. The stability of the algorithm is examined through numerical experiments.
divide and conquer algorithm, Divide and conquer algorithm, divide and conquer algo, superfast algorithm, Toeplitz-like matrices, 004, 510
divide and conquer algorithm, Divide and conquer algorithm, divide and conquer algo, superfast algorithm, Toeplitz-like matrices, 004, 510
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