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arXiv 2007.10748math.CA
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雅可比多项式和Gauss-Jacobi quadrature的节点和权的大次数和参数的初等函数渐近展开

Asymptotic expansions of Jacobi polynomials and of the nodes and weights of Gauss-Jacobi quadrature for large degree and parameters in terms of elementary functions

Amparo Gil, Javier Segura, Nico M. Temme

摘要:

给出了雅可比多项式在大次数$n$和参数$α$、$β$下的初等函数形式的渐近逼近.从这些新结果出发,导出了零点的渐近展开,并给出了求展开式中系数的方法。这些近似值可作为迭代法的初值,用于计算大次数和参数的Gauss-Jacobi求积的节点。计算这些高斯求积的节点和权重的渐近近似的性能与数值例子说明。

英文摘要:

Asymptotic approximations of Jacobi polynomials are given in terms of elementary functions for large degree $n$ and parameters $α$ and $β$. From these new results, asymptotic expansions of the zeros are derived and methods are given to obtain the coefficients in the expansions. These approximations can be used as initial values in iterative methods for computing the nodes of Gauss--Jacobi quadrature for large degree and parameters. The performance of the asymptotic approximations for computing the nodes and weights of these Gaussian quadratures is illustrated with numerical examples.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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