Effective preconditioning through minimum degree ordering interleaved with incomplete factorization
Effective preconditioning through minimum degree ordering interleaved with incomplete factorization
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通过最小程度排序与不完全分解相交错进行有效预处理
DOI:
10.1016/j.cam.2014.11.010
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发表时间:
2015-05
影响因子:
2.4
通讯作者:
Zhi-Gang Ren
中科院分区:
文献类型:
--
作者:
Liang Li;Ting-Zhu Huang;Yan-Fei Jing;Zhi-Gang Ren
In this paper, we study a kind of effective preconditioning technique, which interleaves the incomplete Cholesky (IC) factorization with an approximate minimum degree ordering. An IC factorization algorithm derived from IKJ-version Gaussian elimination is proposed and some details on implementation are presented. Then we discuss the ways to compute the degrees of the unnumbered nodes exactly and approximately using the concept of element absorbing. When used in conjunction with conjugate gradient algorithm, the new preconditioners usually lead to fast convergence. The numerical experiments show that the interleaving of symbolic ordering and numerical IC factorization will generate better preconditioners than those generated by the IC factorization without ordering or with purely symbolic ordering ahead of the factorization.
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影响因子:
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