共查询到17条相似文献,搜索用时 734 毫秒
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寇吉垚 《应用数学与计算数学学报》2010,24(2):119-123
本文主要讨论了生存函数的插值问题,使用了非节点端点的三次样条插值和α-power插值两种方法对生存函数进行了插值,并与传统的三种插值假设:死亡均匀分布假设、常数死亡力假设、Balducci假设做了比较.另外,我们对α-power插值中的α进行了拟合,并通过误差分析表明先对α拟合后再进行α-power插值,其插值的误差将会变得非常小,几乎与样条插值相仿. 相似文献
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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
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采用Moran指标分析截面数据空间自相关性.针对具有空间自相关截面数据缺失插值问题,分别建立一阶空间自回归插值模型与克立格方法插值模型,在此基础上建立截面数据的组合插值模型,并用信息熵法确定组合插值模型的加权系数.用2003年福建部分市县城镇化水平的截面数据建立插值模型实证研究结果表明:组合插值模型的效果优于单项插值模型的效果. 相似文献
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基于线性空间的有关理论,建立Lagrange插值和Hermite插值的统一形式,揭示它们内在的一致性,并对更为广泛的一类线性空间上的插值问题研究插值函数的存在性、唯一性以及插值函数的表示形式. 相似文献
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Newton's polynomial interpolation may be the favorite linear interpolation,associated continued fractions interpolation is a new type nonlinear interpolation.We use those two interpolation to construct a new kind of bivariate blending rational interpolants.Characteristic theorem is discussed.We give some new blending interpolation formulae. 相似文献
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Ming Zhang 《Applied Numerical Mathematics》2011,61(5):666-674
The purpose of this paper is to put forward a kind of Hermite interpolation scheme on the unit sphere. We prove the superposition interpolation process for Hermite interpolation on the sphere and give some examples of interpolation schemes. The numerical examples shows that this method for Hermite interpolation on the sphere is feasible. And this paper can be regarded as an extension and a development of Lagrange interpolation on the sphere since it includes Lagrange interpolation as a particular case. 相似文献
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本文构造一类新的基于函数值和偏导数值的双变量加权混合有理插值样条.与已有的有理插值样条相比,这类新的有理插值样条具有以下四方面的特性,其一,插值函数可以由简单的对称基函数来表示;其二,对任何正参数,插值函数满足C1连续,而且,在不限制参数取值的条件之下,插值曲面保持光滑;其三,插值函数不但含有参数,而且带有加权系数,增加了插值函数的自由度;其四,插值曲面的形状随着参数与加权系数的变化而变化.同时,本文讨论此类插值曲面的性质,包括基函数的性质、积分加权系数的性质和插值函数的边界性质.此类插值函数的优势在于,不改变给定插值数据的前提下,通过选择合适的参数和不同的加权系数,对插值区域内的任意点的函数值进行修改.因此可将其应用于曲面设计,根据实际设计需要,自由地修改曲面形状.数值实验表明,此类新的有理样条插值具有良好的约束控制性质. 相似文献
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杨松林 《高等学校计算数学学报》2005,27(1):1-6
The matrix valued rational interpolation is very useful in the partial realization problem and model reduction for all the linear system theory. Lagrange basic functions have been used in matrix valued rational interpolation. In this paper, according to the property of cardinal spline interpolation, we constructed a kind of spline type matrix valued rational interpolation, which based on cardinal spline. This spline type interpolation can avoid instability of high order polynomial interpolation and we obtained a useful formula. 相似文献
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Thomas Sauer 《Numerische Mathematik》1997,78(1):59-85
Summary. Minimal degree interpolation spaces with respect to a finite set of points are subspaces of multivariate polynomials of least
possible degree for which Lagrange interpolation with respect to the given points is uniquely solvable and degree reducing.
This is a generalization of the concept of least interpolation introduced by de Boor and Ron. This paper investigates the
behavior of Lagrange interpolation with respect to these spaces, giving a Newton interpolation method and a remainder formula
for the error of interpolation. Moreover, a special minimal degree interpolation space will be introduced which is particularly
beneficial from the numerical point of view.
Received June 9, 1995 / Revised version received June 26, 1996 相似文献
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With Newton’s interpolating formula, we construct a kind of block based Newton-like blending osculatory interpolation.The interpolation provides us many flexible interpolation schemes for choices which include the expansive Newton’s polynomial interpolation as its special case. A bivariate analogy is also discussed and numerical examples are given to show the effectiveness of the interpolation. 相似文献
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有理插值比多项式插值有更好的近似,但有理插值一般很难控制极点的产生.基于Thiele型连分式插值与重心有理插值,构造三元重心Thiele型混合有理插值,当选取适当的权后能避免部分极点的产生.文章最后通过数值例子验证了这种方法的正确性和有效性. 相似文献