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Evaluation of Functions5.0 IntroductionThe purpose of this chapter is to acquaint you with a selection of the techniquesthat are frequently used in evaluating functions. In Chapter 6, we will apply andillustrate these techniques by giving routines for a variety of specific functions.The purposes of this chapter and the next are thus mostly in harmony, but thereis nevertheless some tension between them: Routines that are clearest and mostillustrative of the general techniques of this chapter are not always the methods ofchoice for a particular special function.
By comparing this chapter to the next one,you should get some idea of the balance between “general” and “special” methodsthat occurs in practice.Insofar as that balance favors general methods, this chapter should give youideas about how to write your own routine for the evaluation of a function which,while “special” to you, is not so special as to be included in Chapter 6 or thestandard program libraries.CITED REFERENCES AND FURTHER READING:Fike, C.T.
1968, Computer Evaluation of Mathematical Functions (Englewood Cliffs, NJ: PrenticeHall).Lanczos, C. 1956, Applied Analysis; reprinted 1988 (New York: Dover), Chapter 7.5.1 Series and Their ConvergenceEverybody knows that an analytic function can be expanded in the neighborhoodof a point x0 in a power series,f(x) =∞Xak (x − x0 )k(5.1.1)k=0Such series are straightforward to evaluate. You don’t, of course, evaluate the kthpower of x − x0 ab initio for each term; rather you keep the k − 1st power and updateit with a multiply. Similarly, the form of the coefficients a is often such as to makeuse of previous work: Terms like k! or (2k)! can be updated in a multiply or two.165Sample page from NUMERICAL RECIPES IN C: THE ART OF SCIENTIFIC COMPUTING (ISBN 0-521-43108-5)Copyright (C) 1988-1992 by Cambridge University Press.Programs Copyright (C) 1988-1992 by Numerical Recipes Software.Permission is granted for internet users to make one paper copy for their own personal use.
Further reproduction, or any copying of machinereadable files (including this one) to any servercomputer, is strictly prohibited. To order Numerical Recipes books,diskettes, or CDROMsvisit website http://www.nr.com or call 1-800-872-7423 (North America only),or send email to trade@cup.cam.ac.uk (outside North America).Chapter 5..
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