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Multidimensional phase recovery and interpolative decomposition butterfly factorization
Journal of Computational Physics ( IF 4.1 ) Pub Date : 2020-03-27 , DOI: 10.1016/j.jcp.2020.109427
Ze Chen , Juan Zhang , Kenneth L. Ho , Haizhao Yang

This paper focuses on the fast evaluation of the matrix-vector multiplication (matvec) g=Kf for KCN×N, which is the discretization of a multidimensional oscillatory integral transform g(x)=K(x,ξ)f(ξ)dξ with a kernel function K(x,ξ)=e2πiΦ(x,ξ), where Φ(x,ξ) is a piecewise smooth phase function with x and ξ in Rd for d=2 or 3. A new framework is introduced to compute Kf with O(Nlog(N)) time and memories complexity in the case that only indirect access to the phase function Φ is available. This framework consists of two main steps: 1) an O(Nlog(N)) algorithm for recovering the multidimensional phase function Φ from indirect access is proposed; 2) a multidimensional interpolative decomposition butterfly factorization (MIDBF) is designed to evaluate the matvec Kf with an O(Nlog(N)) complexity once Φ is available. Numerical results are provided to demonstrate the effectiveness of the proposed framework.



中文翻译:

多维相恢复和插值分解蝶式分解

本文着重于矩阵向量乘法(matvec)的快速评估 G=ķF 对于 ķCñ×ñ,这是多维振荡积分变换的离散化 GX=ķXξFξdξ 具有内核功能 ķXξ=Ë2π一世ΦXξ,在哪里 ΦXξ是具有分段平滑相位函数Xξ[Rd 对于 d=2或3的新框架引入到计算Kf个Øñ日志ñ在仅间接访问相位函数Φ的情况下,时间和存储器的复杂性。该框架包括两个主要步骤:1)Øñ日志ñ提出了一种从间接访问中恢复多维相位函数Φ的算法。2)多维内插分解蝴蝶因式分解(MIDBF)被设计来评估matvec Kf个Øñ日志ñΦ可用时的复杂度。数值结果表明了所提出框架的有效性。

更新日期:2020-03-27
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