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arXiv 2501.05902math.NAcs.NA
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关于有理径向基函数单位分解法中导数直接逼近的一个注记

A Note on the Direct Approximation of Derivatives in Rational Radial Basis Functions Partition of Unity Method

Vahid Mohammadi, Stefano De Marchi

AI总结:

针对含陡峭梯度或不连续函数的导数计算,提出D-RRBF-PU方法,通过消去权函数导数简化局部有理逼近求导,提升效率并给出误差界与数值验证。

摘要:

本文提出一种直接有理径向基函数单位分解(D-RRBF-PU)方法,用于计算具有陡峭梯度或不连续性的函数的导数。该方法的新颖之处在于导数的逼近方式。更具体地说,在计算每个补片中局部有理逼近式的导数时,单位分解权函数的所有导数均被消去。因此,与标准公式所得结果相比,近似导数能够更简便、更快速地获得。文中简要讨论了相应的误差界,并给出若干数值结果以展示该技术的潜力。

英文摘要:

This paper proposes a Direct Rational Radial Basis Functions Partition of Unity (D-RRBF-PU) approach to compute derivatives of functions with steep gradients or discontinuities. The novelty of the method concerns how derivatives are approximated. More precisely, all derivatives of the partition of unity weight functions are eliminated while we compute the derivatives of the local rational approximants in each patch. As a result, approximate derivatives are obtained more easily and quickly than those obtained in the standard formulation. The corresponding error bounds are briefly discussed. Some numerical results are presented to show the technique's potential.

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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