求解一阶初值问题系统的数值块混合算法

IF 0.9 Q2 MATHEMATICS
Nathaniel Mahwash Kamoh, Bwebum Cleofas Dang, Joshua Sunday
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引用次数: 0

摘要

常微分方程在工程、商业和医疗保健等许多物理环境中都非常重要,因此需要一种有效而成功的数值算法来解释人类许多领域中的模糊现象。在本研究中,采用了插值和拼位技术,推导出一种用于一阶初值问题(IVP)系统数值求解的块混合算法(BHA)。为了推导 BHA,在两个选定点对移位 Legendre 多项式进行了插值,并在七个选定点对其导数进行了定位。这样就得到了一个连续方案,最终在一些点上对该方案进行了评估,从而得到了数值计算中使用的离散方案。此外,还介绍了一些示例,以说明所提算法的适用性和有效性。据观察,所建议的算法具有理想的精确解收敛速度。建议的方法利用了步数以外的点数据,这被视为一个重要的标志;该算法的另一个主要优点是它具有非常小的误差常数(表 2)。本文展示了一些精确结果和数值结果的图示,以说明数值结果与精确解的吻合程度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A numerical block hybrid algorithm for solving systems of first-order initial value problems

Attracted by the importance of ordinary differential equations in many physical situations like, engineering, business and health care in particular, an effective and successful numerical algorithm is needed in order to explain many of the ambiguities about the phenomena in many fields of human endeavor. In this study, an interpolation and collocation technique are adopted in deriving a Block Hybrid Algorithm (BHA) for the numerical solution of systems of first-order Initial Value Problems (IVPs). To derive the BHA, the shifted Legendre polynomials was interpolated at two selected points and its derivative was collocated at seven selected points. This led to a continuous scheme which was eventually evaluated at some points to obtain the discrete schemes used in the numerical computation. Furthermore, some illustrative examples are introduced to show the applicability and validity of the proposed algorithm. It was observed that the proposed algorithm has the desired rate of convergence to the exact solution. The suggested method utilizes data at points other than the step numbers which is viewed as an important landmark; another major advantage of this algorithm is that it possesses remarkably small error constants (Table 2). Some graphical representations of the exact and numerical results are presented to show how accurate the numerical results agree with the exact solutions.

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来源期刊
Afrika Matematika
Afrika Matematika MATHEMATICS-
CiteScore
2.00
自引率
9.10%
发文量
96
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