arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2002.04828math.NAcs.NA
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一种更鲁棒的受限奇异值分解算法

Towards a more robust algorithm for computing the restricted singular value decomposition

Ian N. Zwaan

摘要:

提出了一种计算稠密矩阵限制奇异值分解的新算法。与Zha的方法\cite{Zha92}一样,新算法使用隐式Kogbetliantz迭代,但有四个主要创新。第一个创新是一个有用的准上三角广义舒尔形式,只需要正交变换计算。根据应用,可以使用Schur形式代替完全分解。第二个创新是一个新的预处理阶段,需要更少的排名确定比以前的方法。第三个创新是一个数值稳定的RSVD算法的$2\times 2$上三角形矩阵,形成了隐式Kogbetliantz迭代的关键组成部分。第四个创新是一个替代缩放的限制奇异三胞胎,结果在优雅的公式计算。除了这四个创新,算法的定性(数值)特性进行了广泛的讨论。在(可选的)后处理阶段的一些数值挑战也被认为是;虽然,他们的解决方案需要进一步的研究。数值试验和算例验证了该方法的有效性。

英文摘要:

A new algorithm to compute the restricted singular value decomposition of dense matrices is presented. Like Zha's method \cite{Zha92}, the new algorithm uses an implicit Kogbetliantz iteration, but with four major innovations. The first innovation is a useful quasi-upper triangular generalized Schur form that just requires orthonormal transformations to compute. Depending on the application, this Schur form can be used instead of the full decomposition. The second innovation is a new preprocessing phase that requires fewer rank determinations than previous methods. The third innovation is a numerically stable RSVD algorithm for $2\times 2$ upper-triangular matrices, which forms a key component of the implicit Kogbetliantz iteration. The fourth innovation is an alternative scaling for the restricted singular triplets that results in elegant formulas for their computation. Beyond these four innovations, the qualitative (numerical) characteristics of the algorithm are discussed extensively. Some numerical challenges in the (optional) postprocessing phase are considered too; though, their solutions require further research. Numerical tests and examples confirm the effectiveness of the method.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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