共查询到20条相似文献,搜索用时 406 毫秒
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利用带有积分余项的Taylor公式重新推导了Simpson校正公式,同时给出了其误差的精确表示,而这一结果将优于Simpson校正公式[J]中的误差估计. 相似文献
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本文利用 Euler-Maclaurin求和公式构造了一类求积公式 ,称为修正复合梯形公式 .它和复合梯形公式的求积节点及计算量是一样的 ,但收敛阶有很大的提高 ,特别适合于计算带有各种类型小波的数值积分 . 相似文献
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研究了应用梯形法进行多重积分数值计算的余项的一般形式,为多重积分的外推算法提供了理论依据,同时提出了一种按积分变量逐维外推的数值计算方法. 相似文献
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Cotes数值求积公式的校正 总被引:2,自引:0,他引:2
本文研究了Cotes数值求积公式代数精度的问题,给出了Cotes求积公式余项"中间点"的渐进性定理.利用该定理得到了改进的Cotes求积公式,并证明了改进后的Cotes求积公式比原来的公式具有较高的代数精度. 相似文献
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本利用Euler-Maclaurin求和公式构造了一类求积公式,称为修正复合梯形公式。它和复合梯形公式的求积节点及计算量是一样的,但收敛阶有很大的提高,特别适合于计算带有种类型小波的数值积分。 相似文献
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This paper reviews the Fourier-series method for calculating cumulative distribution functions (cdf's) and probability mass functions (pmf's) by numerically inverting characteristic functions, Laplace transforms and generating functions. Some variants of the Fourier-series method are remarkably easy to use, requiring programs of less than fifty lines. The Fourier-series method can be interpreted as numerically integrating a standard inversion integral by means of the trapezoidal rule. The same formula is obtained by using the Fourier series of an associated periodic function constructed by aliasing; this explains the name of the method. This Fourier analysis applies to the inversion problem because the Fourier coefficients are just values of the transform. The mathematical centerpiece of the Fourier-series method is the Poisson summation formula, which identifies the discretization error associated with the trapezoidal rule and thus helps bound it. The greatest difficulty is approximately calculating the infinite series obtained from the inversion integral. Within this framework, lattice cdf's can be calculated from generating functions by finite sums without truncation. For other cdf's, an appropriate truncation of the infinite series can be determined from the transform based on estimates or bounds. For Laplace transforms, the numerical integration can be made to produce a nearly alternating series, so that the convergence can be accelerated by techniques such as Euler summation. Alternatively, the cdf can be perturbed slightly by convolution smoothing or windowing to produce a truncation error bound independent of the original cdf. Although error bounds can be determined, an effective approach is to use two different methods without elaborate error analysis. For this purpose, we also describe two methods for inverting Laplace transforms based on the Post-Widder inversion formula. The overall procedure is illustrated by several queueing examples. 相似文献
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Olof B. Widlund 《BIT Numerical Mathematics》1967,7(1):65-70
It has been shown by Dahlquist [3] that the trapezoidal formula has the smallest truncation error among all linear multistep methods with a certain stability property. It is the purpose of this note to show that a slightly different stability requirement permits methods of higher accuracy.The preparation of this paper was sponsored by the Swedish Technical Research Council. 相似文献
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WANG Xinghua~ 《中国科学A辑(英文版)》2005,48(1)
The best quadrature formula has been found in the following sense:for afunction whose norm of the second derivative is bounded by a given constant and thebest quadrature formula for the approximate evaluation of integration of that function canminimize the worst possible error if the values of the function and its derivative at certainnodes are known.The best interpolation formula used to get the quadrature formula aboveis also found.Moreover,we compare the best quadrature formula with the open compoundcorrected trapezoidal formula by theoretical analysis and stochastic experiments. 相似文献
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The best quadrature formula has been found in the following sense: for a function whose norm of the second derivative is bounded
by a given constant and the best quadrature formula for the approximate evaluation of integration of that function can minimize
the worst possible error if the values of the function and its derivative at certain nodes are known. The best interpolation
formula used to get the quadrature formula above is also found. Moreover, we compare the best quadrature formula with the
open compound corrected trapezoidal formula by theoretical analysis and stochastic experiments. 相似文献
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Frank Uhlig 《Journal of Difference Equations and Applications》2013,19(7):930-941
ABSTRACTZhang Neural Networks rely on convergent 1-step ahead finite difference formulas of which very few are known. Those which are known have been constructed in ad-hoc ways and suffer from low truncation error orders. This paper develops a constructive method to find convergent look-ahead finite difference schemes of higher truncation error orders. The method consists of seeding the free variables of a linear system comprised of Taylor expansion coefficients followed by a minimization algorithm for the maximal magnitude root of the formula's characteristic polynomial. This helps us find new convergent 1-step ahead finite difference formulas of any truncation error order. Once a polynomial has been found with roots inside the complex unit circle and no repeated roots on it, the associated look-ahead ZNN discretization formula is convergent and can be used for solving any discretized ZNN based model. Our method recreates and validates the few known convergent formulas, all of which have truncation error orders at most 4. It also creates new convergent 1-step ahead difference formulas with truncation error orders 5 through 8. 相似文献
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To estimate the truncation error of a matrix power series we need information about the magnitude of high powers of a matrix. Inequalities bearing on this question are surveyed, and their use is exemplified by calculations of bounds for the truncation error of the geometric series in matrices. 相似文献
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Carlo Bardaro Paul L. Butzer Ilaria Mantellini 《Integral Transforms and Special Functions》2016,27(1):17-29
In this paper, we establish a Mellin version of the classical Parseval formula of Fourier analysis in the case of Mellin bandlimited functions, and its equivalence with the exponential sampling formula (ESF) of signal analysis, in which the samples are not equally spaced apart as in the classical Shannon theorem, but exponentially spaced. Two quite different examples are given illustrating the truncation error in the ESF. We employ Mellin transform methods for square-integrable functions. 相似文献
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二元矩阵Pade-型逼近的计算比较复杂.本文受Benouahmane和Cuyt的启发,通过引入一种变量代换,将二元齐次矩阵形式幂级数转化为一元含参数形式的矩阵形式幂级数,并给出了二元齐次矩阵Pade-型逼近的构造性的定义和误差公式的证明.数值实例说明了此方法的有效性. 相似文献
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Bengt Lindberg 《BIT Numerical Mathematics》1971,11(1):29-52
The trapezoidal formula applied to stiff systems of differential equations is stable, but produces slowly decaying oscillatory errors. A simple smoothing procedure which damps out the oscillations is given and it is shown that the discretization error after smoothing still contains only even powers of the stepsize. Some numerical examples reveal the power of the smoothing combined with extrapolation. 相似文献
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Kristin M. Flornes Yurii Lyubarskii Kristian Seip 《Applied and Computational Harmonic Analysis》1999,7(3):305
In this paper, band-limited functions are reconstructed from their values taken at a sequence of irregularly spaced sample points. We use a modified Lagrange formula, which is attributed to Boas and Bernstein. The formula used in this paper differs from the classical Boas–Bernstein formula in the following way. Instead of using infinite canonical products with respect to the whole sequence of sample points, we use canonical products with respect to sequences of sample points which are irregularly spaced only on finite intervals. Estimates for the truncation error of this reconstruction method are given. 相似文献