arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1912.03090math.NAcs.NA
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立方体上的有效多元逼近

Efficient multivariate approximation on the cube

Robert Nasdala, Daniel Potts

摘要:

我们将加权$L_{2}$ -被积函数的周期化策略与有效的逼近方法相结合,以逼近高维立方体$\left[-\frac{1}{2},\frac{1}{2}\right]^{d}$上的多元非周期函数。我们的概念允许确定$d$变量环面到立方体变换${ψ:\left[-\frac{1}{2},\frac{1}{2}\right]^{d}\to\left[-\frac{1}{2},\frac{1}{2}\right]^{d}}$上的条件,使得当应用$ψ$时,非周期函数被变换成Sobolev空间$\mathcal H^{m}(\mathbb{T}^{d})$中的光滑函数。我们适应一些$L_{\infty}(\mathbb{T}^{d})$ -和$L_{2}(\mathbb{T}^{d})$ -近似误差估计单秩- $1$晶格近似方法和调整算法的快速评估和快速重建的多变量三角多项式的环面,以将这些方法应用到非周期性的设置。我们说明的理论研究结果通过数值试验在$d=5$尺寸。

英文摘要:

We combine a periodization strategy for weighted $L_{2}$-integrands with efficient approximation methods in order to approximate multivariate non-periodic functions on the high-dimensional cube $\left[-\frac{1}{2},\frac{1}{2}\right]^{d}$. Our concept allows to determine conditions on the $d$-variate torus-to-cube transformations ${ψ:\left[-\frac{1}{2},\frac{1}{2}\right]^{d}\to\left[-\frac{1}{2},\frac{1}{2}\right]^{d}}$ such that a non-periodic function is transformed into a smooth function in the Sobolev space $\mathcal H^{m}(\mathbb{T}^{d})$ when applying $ψ$. We adapt some $L_{\infty}(\mathbb{T}^{d})$- and $L_{2}(\mathbb{T}^{d})$-approximation error estimates for single rank-$1$ lattice approximation methods and adjust algorithms for the fast evaluation and fast reconstruction of multivariate trigonometric polynomials on the torus in order to apply these methods to the non-periodic setting. We illustrate the theoretical findings by means of numerical tests in up to $d=5$ dimensions.

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