A Reformulated Low‐Rank ADI Iteration with Explicit Residual Factors

A Reformulated Low‐Rank ADI Iteration with Explicit Residual Factors
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具有显式残差因子的重新表述的低阶 ADI 迭代

DOI:
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发表时间:
2013
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通讯作者:
J. Saak
J. Saak
中科院分区:
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文献类型:
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作者:
P. Benner;P. Kürschner;J. Saak

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基于我们最近关于大规模李雅普诺夫方程的低秩ADI迭代的发现[1,2],我们提出了LR-ADI的数学等价公式,其迭代直接与李雅普诺夫残差的低秩因子相关。如果出现复杂的移位参数并有效地处理[1],则从计算的角度来看,这种重新表述稍微更有效,因为它保证了需要求解的所有线性系统的右侧都是真实的。(© 2013 Wiley‐VCH Verlag GmbH & Co. KGaA,魏因海姆)
Based on our recent findings [1, 2] regarding the low‐rank ADI iteration for large‐scale Lyapunov equations, we propose a mathematically equivalent formulation of the LR‐ADI whose iteration is directly connected to low rank factors of the Lyapunov residual. If complex shift parameters occur and are handled efficiently [1], this reformulation is slightly more efficient from a computational point of view, since it guarantees that the right hand sides of all linear systems that need to be solved are real. (© 2013 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)