Approximate Inverse Circulant-plus-Diagonal Preconditioners for Toeplitz-plus-Diagonal Matrices
Approximate Inverse Circulant-plus-Diagonal Preconditioners for Toeplitz-plus-Diagonal Matrices
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Toeplitz 加对角矩阵的近似逆循环加对角预处理器
DOI:
10.1137/080720280
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发表时间:
2010-04
期刊:
影响因子:
--
通讯作者:
J.Y. Pan
中科院分区:
文献类型:
--
作者:
M.K. Ng;J.Y. Pan
We consider the solutions of Hermitian positive definite Toeplitz-plus-diagonal systems $(T+D)x=b$, where $T$ is a Toeplitz matrix and $D$ is diagonal and positive. However, unlike the case of Toeplitz systems, no fast direct solvers have been developed for solving them. In this paper, we employ the preconditioned conjugate gradient method with approximate inverse circulant-plus-diagonal preconditioners to solving such systems. The proposed preconditioner can be constructed and implemented efficiently using fast Fourier transforms. We show that if the entries of $T$ decay away exponentially from the main diagonals, the preconditioned conjugate gradient method applied to the preconditioned system converges very quickly. Numerical examples including spatial regularization for image deconvolution application are given to illustrate the effectiveness of the proposed preconditioner.
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DOI:
10.1364/josaa.14.003162
发表时间:
1997-12
影响因子:
1.9
作者:
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J. Nagy;V. P. Pauca;R. Plemmons;T. Torgersen
DOI:
10.1137/0112045
发表时间:
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期刊:
Journal of The Society for Industrial and Applied Mathematics
影响因子:
--
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W. F. Trench
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--
发表时间:
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--
影响因子:
--
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DOI:
10.1007/978-0-387-09766-4_2219
发表时间:
2011
期刊:
--
影响因子:
--
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