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Algorithm 969: Computation of the incomplete gamma function for negative values of the argument

Abstract: An algorithm for computing the incomplete gamma function ?*(a, z) for real values of the parameter a and negative real values of the argument z is presented. The algorithm combines the use of series expansions, Poincaré-type expansions, uniform asymptotic expansions, and recurrence relations, depending on the parameter region. A relative accuracy ~10-13 in the parameter region (a, z) ? [- 500, 500] × [- 500, 0) can be obtained when computing the function ?*(a, z) with the Fortran 90 module IncgamNEG implementing the algorithm.

Other publications of the same journal or congress with authors from the University of Cantabria

 Authorship: Gil A., Ruiz-Antolín D., Segura J., Temme N.,

 Fuente: ACM Transactions on Mathematical Software, 2017, 43(3), Article No. 26

 Publisher: Association for Computing Machinery (ACM)

 Publication date: 01/01/2017

 No. of pages: 9

 Publication type: Artículo de Revista

 DOI: 10.1145/2972951

 ISSN: 0098-3500,1557-7295

 Spanish project: MTM2012-34787. NMT

 Publication Url: http://dx.doi.org/10.1145/2972951