Preconditioning Linear Least-Squares Problems by Identifying a Basis Matrix
Preconditioning Linear Least-Squares Problems by Identifying a Basis Matrix
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通过识别基矩阵来预处理线性最小二乘问题
DOI:
10.1137/140975358
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发表时间:
2015
影响因子:
3.1
通讯作者:
Arioli M
中科院分区:
文献类型:
--
作者:
Arioli M
We study the solution of the linear least-squares problemwhere the matrix() has rankand is large and sparse. We assume thatis available as a matrix, not an operator. The preconditioning of this problem is difficult because the matrixdoes not have the properties of differential problems that make standard preconditioners effective. Incomplete Cholesky techniques applied to the normal equations do not produce a well-conditioned problem. We attempt to bypass the ill-conditioning by finding annonsingular submatrixofthat reduces the Euclidean norm of. We useto precondition a symmetric quasi-definite linear system whose condition number is then independent of the condition number ofand has the same solution as the original least-squares problem. We illustrate the performance of our approach on some standard test problems and show it is competitive with other approaches.
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DOI:
--
发表时间:
1985
期刊:
影响因子:
--
作者:
D. E. Knuth
通讯作者:
D. E. Knuth
影响因子:
1.5
作者:
A. George;K. Ikramov;A. B. Kucherov
通讯作者:
A. B. Kucherov
DOI:
--
发表时间:
1979
期刊:
影响因子:
--
作者:
D. Scott
通讯作者:
D. Scott
DOI:
--
发表时间:
1990
期刊:
Conference on Algorithms and Hardware for Parallel Processing
影响因子:
--
作者:
M. Hegland
通讯作者:
M. Hegland