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Floater

2024-04-16 16:19| 来源: 网络整理| 查看: 265

在本文中,Floater 和 Hormann 引入的插值有理函数被推广,产生了一个全新的有理函数族,具体取决于γ,一个附加的正整数参数。为了γ=1,获得原始的 Floater-Hormann 插值。什么时候γ>1我们证明新的有理函数具有原始 Floater-Hormann 函数的许多优良特性。事实上,对于紧凑区间中的任何节点配置,它们没有实极点,对给定数据进行插值,将多项式保留到一定的固定程度,并且具有重心型表示。此外,我们根据最小值(H*)和最大(H) 两个连续节点之间的距离。事实证明,与原始的 Floater-Hormann 插值相比,对于所有γ>1在等距和准等距节点配置的情况下(即,当H~H*)。对于这样的配置,随着节点数量趋于无穷大,我们证明新的插值(γ>1) 一致收敛于插值函数F,对于任何连续函数F和所有γ>1。原始 FH 插值不能保证同样的效果(γ=1)。此外,我们为具有不同平滑度的函数提供近似误差的统一和逐点估计。数值实验说明了理论结果,并显示了与原始 Floater-Hormann 插值相比,不太平滑的函数具有更好的误差曲线。

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A generalization of Floater–Hormann interpolants

In this paper the interpolating rational functions introduced by Floater and Hormann are generalized leading to a whole new family of rational functions depending on γ, an additional positive integer parameter. For γ=1, the original Floater–Hormann interpolants are obtained. When γ>1 we prove that the new rational functions share a lot of the nice properties of the original Floater–Hormann functions. Indeed, for any configuration of nodes in a compact interval, they have no real poles, interpolate the given data, preserve the polynomials up to a certain fixed degree, and have a barycentric-type representation. Moreover, we estimate the associated Lebesgue constants in terms of the minimum (h∗) and maximum (h) distance between two consecutive nodes. It turns out that, in contrast to the original Floater–Hormann interpolants, for all γ>1 we get uniformly bounded Lebesgue constants in the case of equidistant and quasi-equidistant nodes configurations (i.e., when h∼h∗). For such configurations, as the number of nodes tends to infinity, we prove that the new interpolants (γ>1) uniformly converge to the interpolated function f, for any continuous function f and all γ>1. The same is not ensured by the original FH interpolants (γ=1). Moreover, we provide uniform and pointwise estimates of the approximation error for functions having different degrees of smoothness. Numerical experiments illustrate the theoretical results and show a better error profile for less smooth functions compared to the original Floater–Hormann interpolants.



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