Simple Search

Query:

Enter a query and click »Search«...

Format:

Display: entries per page entries

Zbl 0892.65010
Nardin, Mark; Perger, W.F.; Bhalla, Atul
Algorithm 707: CONHYP: A numerical evaluator of the confluent hypergeometric function for complex arguments of large magnitudes. (English)
[J] ACM Trans. Math. Softw. 18, No.3, 345-349 (1992). ISSN 0098-3500

Summary: A numerical evaluator for the confluent hypergeometric function for complex arguments with large magnitudes using a direct summation of Kummer's series is presented. Extended precision subroutines using large arrays to accumulate a single numerator and denominator are ultimately used in a single division to arrive at the final result. The accuracy has been verified through a variety of tests and they show the evaluator to be consistently accurate to 13 significant figures, and on rare occasion accurate to only 9 for magnitudes of the arguments ranging into the thousands in any quadrant in the complex plane. Because the evaluator automatically determines the number of significant figures of machine precision, and because it is written in FORTRAN 77, tests on various computers have shown the evaluator to provide consistently accurate results, making the evaluator very portable. The principal drawback is that, for certain arguments, the evaluator is slow; however, the evaluator remains valuable as a benchmark even in such cases.

MSC 2000:: *65D20 Computation of special functions
33C15 Confluent hypergeometric functions

Keywords: confluent hypergeometric function; complex argument; large magnitudes; direct summation of Kummer's series; Fortran 77

Comment on this Item PDF MathML XML ASCII DVI PS BibTeX Online Ordering Article Article Journal

	Scientific prize winners of the ICM 2010
	Overhang
	Lie groups, physics and geometry. An introduction for physicists, engineers and chemists.

Simple Search

Zentralblatt MATH Berlin [Germany]