共查询到20条相似文献,搜索用时 78 毫秒
1.
在多项式逼近理论及样条逼近的讨论中,Hermite多项式余项讨论是很重要的。作者在以前一系列工作中(〔1,2〕),对于插值Hermite多项式的余项给出一系列表达式,特别是各阶导数余项的表达式。运用这些表达式成功地讨论了一系列样条函数。给出它们的余项估计和渐近展开。 相似文献
2.
杨义群 《数学的实践与认识》1985,(1)
设 H_n(x)是在节点 x_0,x_1,…,x_n 上插值 f(x)的 n 次 Hermite 插值多项式.最近[1]用函数 f 的差商给出了 H_n(x) 的表达式.这里指出:这一表达式实际已有 (例如参见[2]),函数 f 的 n 次 Hermite 插值多项式 H_n(x) 及其余项可用 f 的差商简单地表示为 相似文献
3.
插值多项式的余项表示及其在样条分析中的应用 总被引:1,自引:0,他引:1
一、插值多项式的余项表达式 设n次多项式P_n(x)在节点a_0,…,a_n上插值f(x)。当a_0,…,a_n互不相同时,该P_n(x)就是Lagrange插值多项式。考虑到a_0,…,a_n中有可能重合,我们称P_n(x)为Hermite插值多项式。熟知,Hermite插值多项式的余项 相似文献
4.
通过对插值多项式函数性质进行分析,多项式插值余项的基本形式得到诱导,再从该基本形式出发,获得了多项式插值余项定理的新证明.整个证明过程无需借助辅助函数的构造,因而显得较为自然.这种自然证明的方式也可用于Hermite切触型插值多项式余项的证明. 相似文献
5.
6.
本文给出了Hermite插值多项式及其各阶导数的显式表示. 对于一个在x的某个领域内有足够高阶连续导数的函数f和位于该领域的任意一组节点, 给出了用f的Hermite插值多项式在点x的任意阶导数逼近f(x)的相应导数时余项的渐近表示. 相似文献
7.
本文给出局部显式多结点Hermite插值值算子对多项式函数类再生性的简单证明。针对计算机辅助几何设计的应用背景,分析了三阶多结点Hermite样条插值逼近的具体特性。 相似文献
8.
本文将王兴华在[1]中给出的Lagrange—Hermite插值的余项表示推广到了Hermite-Birkhoff插值的情形。这些工具已有效地用来估计多种插值样条的逼近度。 相似文献
9.
10.
吴正昌 《数学年刊A辑(中文版)》1988,(1)
本文研究多元三角阵列的多项式插值问题,多元Newton插值,多元Abel-Goncarov插值以及Kergin插值都是三角阵列插值的特殊情况,本文首先得到了多元三角阵列插值多项式及其余项的具体表达式;在此基础上,证明了插值问题的存在唯一性;给出了三角阵列插值余项的估计式,进而得到一个有关多元复变函数插值级数的收敛性定理。 相似文献
11.
12.
Wei-Xian HuangGuo-Jin Wang 《Applied mathematics and computation》2011,217(9):4644-4653
This paper presents a new weighted bivariate blending rational spline interpolation based on function values. This spline interpolation has the following advantages: firstly, it can modify the shape of the interpolating surface by changing the parameters under the condition that the values of the interpolating nodes are fixed; secondly, the interpolating function is C1-continuous for any positive parameters; thirdly, the interpolating function has a simple and explicit mathematical representation; fourthly, the interpolating function only depends on the values of the function being interpolated, so the computation is simple. In addition, this paper discusses some properties of the interpolating function, such as the bases of the interpolating function, the matrix representation, the bounded property, the error between the interpolating function and the function being interpolated. 相似文献
13.
14.
一类基于小波基函数插值的有限元方法 总被引:8,自引:0,他引:8
在分析具有大的梯度问题中,将具有紧支集的小波基函数引入到传统的有限元插值函数的构造中,对传统的插值方法进行修正。对新的插值模式进行了数值稳定性(解的唯一存在性)分析并通过分片分析讨论了解的收敛性,新的插值模式所引入的附加自由度通过静力凝聚法来消除,最后得到了基于变分原理的小波有限元列式。 相似文献
15.
In this paper, we shall introduce and study a family of multivariate interpolating refinable function vectors with some prescribed interpolation property. Such interpolating refinable function vectors are of interest in approximation theory, sampling theorems, and wavelet analysis. In this paper, we characterize a multivariate interpolating refinable function vector in terms of its mask and analyze the underlying sum rule structure of its generalized interpolatory matrix mask. We also discuss the symmetry property of multivariate interpolating refinable function vectors. Based on these results, we construct a family of univariate generalized interpolatory matrix masks with increasing orders of sum rules and with symmetry for interpolating refinable function vectors. Such a family includes several known important families of univariate refinable function vectors as special cases. Several examples of bivariate interpolating refinable function vectors with symmetry will also be presented. 相似文献
16.
17.
由线性微分算子确定的样条是连接多项式样条与希氏空间中抽象算子样条的重要环节,对微分算子样条的研究,既可从更高的观点揭示和概括多项式样条,又可启示我们去发现抽象算子样条的一些新的理论和应用. Green函数是研究微分算子样条的重要工具 [1],但在微分算子插值样条的计算及将样条用于数值分析中,再生核方法起着更重要的作用.文献[2][3]给出了与二阶线性微分算子插值样条有关的再生核解析表达式;由此得到了二阶微分算子插值样条与空间W_2~1[a,b]中最佳插值逼近算子的一致性;而且还利用再生核给出了Hi… 相似文献
18.
W_2~m空间中样条插值算子与最佳逼近算子的一致性 总被引:7,自引:0,他引:7
This paper discusses generalized interpolating splines which determined by n order linear differential operators, and the best operators of interpolating approximation in W_2~m spaces, The explicit constructive method for the reproducing kernel in W_2~m space is presented, and proves the uniformity of spline interpolating operators and the best operators of interpolating approximation W_2~m space by reproducing kernel. The explicit expression of approximation error on a bounded ball in W_2~m space, and error estimation of spline operator of approximation are obtained. 相似文献
19.
20.
Bivariate Polynomial Natural Spline Interpolation Algorithms with Local Basis for Scattered Data 总被引:3,自引:0,他引:3
Lutai Guan 《Journal of Computational Analysis and Applications》2003,5(1):77-101
Because of its importance in both theory and applications, multivariate splines have attracted special attention in many fields. Based on the theory of spline functions in Hilbert spaces, bivariate polynomial natural splines for interpolating, smoothing or generalized interpolating of scattered data over an arbitrary domain are constructed with one-sided functions. However, this method is not well suited for large scale numerical applications. In this paper, a new locally supported basis for the bivariate polynomial natural spline space is constructed. Some properties of this basis are also discussed. Methods to order scattered data are shown and algorithms for bivariate polynomial natural spline interpolating are constructed. The interpolating coefficient matrix is sparse, and thus, the algorithms can be easily implemented in a computer. 相似文献