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arXiv 2108.09357math.NAcs.NA
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柔性有理逼近及其在矩阵函数中的应用

Flexible rational approximation and its application for matrix functions

Nir Sharon, Vinesha Peiris, Nadia Sukhorukova, Julien Ugon

AI总结:

本文提出一种独特的优化方法估计极小极大有理逼近并应用于矩阵函数求值,通过添加约束灵活控制矩阵性质(如条件数界限),并在基于直接谱滤波的应用中验证了其高效性。

摘要:

本文提出了一种独特的优化方法,用于估计极小极大有理逼近,并将其应用于矩阵函数求值。我们的方法能够扩展到广义有理逼近,并具有添加约束的灵活性。特别是,后者允许我们控制在矩阵函数求值中所需的特定性质。例如,在正规矩阵的情况下,我们可以保证为求值有理矩阵函数而需要求逆的矩阵的条件数的界限。我们展示了该方法在基于直接谱滤波的矩阵函数的若干应用中的效率。

英文摘要:

This paper proposes a unique optimization approach for estimating the minimax rational approximation and its application for evaluating matrix functions. Our method enables the extension to generalized rational approximations and has the flexibility of adding constraints. In particular, the latter allows us to control specific properties preferred in matrix function evaluation. For example, in the case of a normal matrix, we can guarantee a bound over the condition number of the matrix, which one needs to invert for evaluating the rational matrix function. We demonstrate the efficiency of our approach for several applications of matrix functions based on direct spectrum filtering.

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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