LU Preconditioning for Overdetermined Sparse Least Squares Problems
LU Preconditioning for Overdetermined Sparse Least Squares Problems
复制标题
超定稀疏最小二乘问题的 LU 预处理
DOI:
10.1007/978-3-319-32149-3_13
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发表时间:
2015
期刊:
影响因子:
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通讯作者:
M. Baboulin
中科院分区:
文献类型:
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作者:
G. Howell;M. Baboulin
We investigate how to use an LU factorization with the classical lsqr routine for solving overdetermined sparse least squares problems. Usually L is much better conditioned than A and iterating with L instead of A results in faster convergence. When a runtime test indicates that L is not sufficiently well-conditioned, a partial orthogonalization of L accelerates the convergence. Numerical experiments illustrate the good behavior of our algorithm in terms of storage and convergence.
DOI:
10.1137/1.9780898718003
发表时间:
2003-05
期刊:
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影响因子:
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作者:
Y. Saad
通讯作者:
Y. Saad