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SVD-MPE: An SVD-Based Vector Extrapolation Method of Polynomial Type

机译:SVD-MPE:一种基于SVD的多项式矢量外推方法

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摘要

An important problem that arises in different areas of science and engineering is that of computing the limits of sequences of vectors , where , N being very large. Such sequences arise, for example, in the solution of systems of linear or nonlinear equations by fixed-point iterative methods, and are simply the required solutions. In most cases of interest, however, these sequences converge to their limits extremely slowly. One practical way to make the sequences converge more quickly is to apply to them vector extrapolation methods. Two types of methods exist in the literature: polynomial type methods and epsilon algorithms. In most applications, the polynomial type methods have proved to be superior convergence accelerators. Three polynomial type methods are known, and these are the minimal polynomial extrapolation (MPE), the reduced rank extrapolation (RRE), and the modified minimal polynomial extrapolation (MMPE). In this work, we develop yet another polynomial type method, which is based on the singular value decomposition, as well as the ideas that lead to MPE. We denote this new method by SVD-MPE. We also design a numerically stable algorithm for its implementation, whose computational cost and storage requirements are minimal. Finally, we illustrate the use of SVD-MPE with numerical examples.
机译:在科学和工程的不同领域中出现的一个重要问题是计算向量序列的极限的问题,其中,N非常大。这样的序列例如出现在通过定点迭代方法的线性或非线性方程组的解中,并且仅仅是所需的解。然而,在大多数感兴趣的情况下,这些序列非常缓慢地收敛到其极限。使序列收敛更快的一种实用方法是将向量应用于向量外推法。文献中存在两种类型的方法:多项式类型方法和epsilon算法。在大多数应用中,多项式类型方法已被证明是出色的收敛加速器。已知三种多项式类型的方法,它们是最小多项式外推(MPE),降阶秩外推(RRE)和修改的最小多项式外推(MMPE)。在这项工作中,我们开发了另一种基于奇异值分解的多项式方法以及导致MPE的思想。我们用SVD-MPE表示这种新方法。我们还为其实现设计了数值稳定的算法,其计算成本和存储要求最小。最后,我们通过数值示例来说明SVD-MPE的用法。

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