New Formulas for Computing Incomplete Elliptic Integrals of the First and Second Kind

Author:

DiDonato A. R.1,Hershey A. V.1

Affiliation:

1. U.S. Naval Weapons Laboratory, Dahlgren, Virginia and U.S. Naval Proving Ground

Abstract

New series expansions are developed for computing incomplete elliptic integrals of the first and second kind when the values of the amplitude and modulus are large. The classical series, which are obtained after a binomial expansion of the integrands, are used when the values of the amplitude and modulus are small. The range of use of each series is so selected as to maintain a minimum of rounding error. A special criterion is used to determine when the binomial series should be terminated. The calculation of elliptic integrals by these series expansions is compared with the calculation by the previously established Landen transformation, which has been used by Legendre. The new series yield more accurate results and the average time of computation is 30 per cent shorter. The computing program in the NORC subroutine for the calculation of elliptic integrals is described.

Publisher

Association for Computing Machinery (ACM)

Subject

Artificial Intelligence,Hardware and Architecture,Information Systems,Control and Systems Engineering,Software

Reference9 articles.

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