FUNPACK-2, Subroutine Library, Bessel Function, Elliptical Integrals, Min-max Approximation

1 - Description of problem or function: FUNPACK is a collection of FORTRAN subroutines to evaluate certain special functions. The individual subroutines are (Identification/Description): NATSI0 F2I0 Bessel function I0; NATSI1 F2I1 Bessel function I1; NATSJ0 F2J0 Bessel function J0; NATSJ1 F2J1 Bessel function J1; NATSK0 F2K0 Bessel function K0; NATSK1 F2K1 Bessel function K1; NATSBESY F2BY Bessel function Yν; DAW F1DW Dawson's integral; DELIPK F1EK Complete elliptic integral of the first kind; DELIPE F1EE Complete elliptic integral of the second kind; DEI F1EI Exponential integrals; NATSPSI F2PS Psi (logarithmic derivative of gamma function); MONERR F1MO Error monitoring package . 2 - Method of solution: FUNPACK uses evaluation of min-max approximations