Structure of the preconditioned system in various preconditioned conjugate gradient squared algorithms
Structure of the preconditioned system in various preconditioned conjugate gradient squared algorithms
复制标题
各种预条件共轭梯度平方算法中预条件系统的结构
DOI:
10.1016/j.rinam.2019.100008
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发表时间:
2019
影响因子:
2
通讯作者:
Sugihara Masaaki
中科院分区:
文献类型:
--
作者:
Itoh Shoji;Sugihara Masaaki
An improved preconditioned conjugate gradient squared (PCGS) algorithm has recently been proposed, and it performs much better than the conventional PCGS algorithm. In this paper, the improved PCGS algorithm is verified as a coordinative to the left-preconditioned system, and it has the advantages of both the conventional and the left-PCGS; this is done by comparing, analyzing, and executing numerical examinations of various PCGS algorithms, including another improved one. We show that the direction of the preconditioned system for the CGS method is determined by the operations ofandin the PCGS algorithm. By comparing the logical structures of these algorithms, we show that the direction of the preconditioned system can be switched by the construction and setting of the initial shadow residual vector.
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10.1137/0913035
发表时间:
1992-03-01
期刊:
SIAM JOURNAL ON SCIENTIFIC AND STATISTICAL COMPUTING
影响因子:
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通讯作者:
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1995-05
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发表时间:
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作者:
Shoji Itoh;M. Sugihara
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10.1007/978-3-642-58333-9_5
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2000
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