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浙江大学学报(理学版)  2022, Vol. 49 Issue (3): 324-328    DOI: 10.3785/j.issn.1008-9497.2022.03.009
数学与计算机科学     
一类重心权Hermite有理插值的二阶导数收敛性
康宁1(),荆科2
1.南京财经大学 经济学院,江苏 南京 210023
2.南京财经大学 应用数学学院,江苏 南京 210023
Convergence of second derivative of a family of barycentric Hermite rational interpolants
Ning KANG1(),Ke JING2
1.School of Economics,Nanjing University of Finance and Economics,Nanjing 210023,China
2.School of Applied Mathematics,Nanjing University of Finance and Economics,Nanjing 210023,China
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摘要:

研究了一类特殊情形m=1的重心权Hermite有理插值,证明了该插值函数的二阶导数r1?x在插值节点和非插值节点处分别以Oh2d-1Oh2d-3的速度收敛于函数f?x。数值例子进一步验证了方法的有效性。

关键词: 重心权有理插值Hermite插值收敛速度二阶导数    
Abstract:

In this paper, we further study a family of barycentric Hermite rational interpolants in a special case m=1 and prove that the second derivatives r1?x of interpolation function converges to corresponding function f?x at the rate of Oh2d-1 and Oh2d-3 at interpolation nodes and non-interpolation nodes, respectively. Finally, numerical examples further verify the effectiveness of the method.

Key words: barycentric rational interpolation    Hermite interpolation    convergence rates    second derivatives
收稿日期: 2021-04-06 出版日期: 2022-05-24
CLC:  O 241.3  
基金资助: 国家自然科学基金资助项目(11601224);教育部人文社科项目(18YJC790069);江苏省高等学校自然科学研究项目(18KJD110007);国家统计局项目(2018LY28)
作者简介: 康宁(1986—),ORCID:https://orcid.org/0000-0002-2905-6193,女,博士,副教授,主要从事应用数值逼近、统计计算研究,E-mail:9120171058@nufe.edu.cn.
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引用本文:

康宁, 荆科. 一类重心权Hermite有理插值的二阶导数收敛性[J]. 浙江大学学报(理学版), 2022, 49(3): 324-328.

Ning KANG, Ke JING. Convergence of second derivative of a family of barycentric Hermite rational interpolants. Journal of Zhejiang University (Science Edition), 2022, 49(3): 324-328.

链接本文:

https://www.zjujournals.com/sci/CN/10.3785/j.issn.1008-9497.2022.03.009        https://www.zjujournals.com/sci/CN/Y2022/V49/I3/324

实验函数f参数d

插值

区间

插值节点

xi

11/1+x23-5,5-5+10i/n
2[1+tanh-9x+1]/220,1i/n
表1  函数f、参数d和插值节点xi

插值

节点数n

实验1实验2

数值逼近

误差e2

收敛阶

数值逼近

误差e2

收敛阶
102.756×10-18.059
202.528×10-23.48.928×10-13.2
401.474×10-34.11.282×10-12.8
801.496×10-43.32.603×10-22.3
1601.746×10-43.16.975×10-31.9
3202.182×10-53.03.486×10-31.0
6402.728×10-63.01.243×10-31.0
表2  逼近误差和收敛阶
图1  实验1中重心权Hermite有理插值的二阶导数曲线
图2  实验2中重心权Hermite有理插值的二阶导数曲线
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