Numerical Methods for Special Functions by Amparo Gil

By Amparo Gil

Distinct features come up in lots of difficulties of natural and utilized arithmetic, records, physics, and engineering. This publication presents an up to date evaluate of tools for computing distinct services and discusses while to exploit them in average parameter domain names, in addition to in huge and complicated domain names.

the 1st a part of the e-book covers convergent and divergent sequence, Chebyshev expansions, numerical quadrature, and recurrence family. Its concentration is at the computation of exact services. Pseudoalgorithms are given to assist scholars write their very own algorithms. as well as those simple instruments, the authors speak about equipment for computing zeros of detailed services, uniform asymptotic expansions, Padé approximations, and series alterations. The ebook additionally offers particular algorithms for computing numerous specified services (Airy features and parabolic cylinder capabilities, between others).

Audience: This booklet is meant for researchers in utilized arithmetic, clinical computing, physics, engineering, records, and different clinical disciplines during which specific capabilities are used as computational instruments. a few chapters can be utilized ordinarily numerical research classes.

Contents: checklist of Algorithms; Preface; bankruptcy 1: advent; half I: simple equipment. bankruptcy 2: Convergent and Divergent sequence; bankruptcy three: Chebyshev Expansions; bankruptcy four: Linear Recurrence relatives and linked persisted Fractions; bankruptcy five: Quadrature equipment; half II: extra instruments and strategies. bankruptcy 6: Numerical elements of endured Fractions; bankruptcy 7: Computation of the Zeros of particular features; bankruptcy eight: Uniform Asymptotic Expansions; bankruptcy nine: different tools; half III: similar issues and Examples. bankruptcy 10: Inversion of Cumulative Distribution services; bankruptcy eleven: additional Examples; half IV: software program. bankruptcy 12: linked Algorithms; Bibliography; Index.

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If 9t(c — a — b) > 0, the value at z = 1 is given by Special cases are The power series for the Gauss hypergeometric function provides a simple and efficient means for the computation of this function, when z is properly inside the unit disk. 2 Chapter 2. 73) converges inside the unit disk, and for numerical computations we can use only the disk \z\ < p < 1, with p depending on numerical requirements, such as precision and efficiency. Other power series are available, however, to extend this domain.

3. Watson's lemma: sectors in the t-plane and the z-plane. 14 (incomplete gamma function T(a, z)). tion For the incomplete gamma func- we expand For this function a = n, and we obtain We remark that this asymptotic expansion holds uniformly in the sector |ph z\ < \it — S. This range is much larger than the usual domain of definition for the incomplete gamma function, which reads |phz | < n. 13. 113) is usually written in the form 38 Chapter 2. Convergent and Divergent Series Observe that the exponential integral is a special case.

When we expand the solutions at a particular point, say, the origin, in many important cases the theory of regular and singular points is needed. 3. 15) governs the well-known functions of mathematical physics. 2. Differential equations and Frobenius series solutions 19 • the Bessel differential equation • the Legendre differential equation • the confluent hypergeometric (Kummer) differential equation • the Whittaker differential equation • the Hermite differential equation • the Weber or parabolic differential equation We will meet these equations in the later sections.

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