A two-phase preconditioning strategy of
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Eun-Joo Lee; Jun Zhang
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Article
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2009
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Elsevier Science
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English
โ 445 KB
A two-phase preconditioning strategy based on a factored sparse approximate inverse is proposed for solving sparse indefinite matrices. In each phase, the strategy first makes the original matrix diagonally dominant to enhance the stability by a shifting method, and constructs an inverse approximati