# Modified bessel functions Iv(z) and Kv(z) of real order and complex argument, to selected accuracy

## Description

Title of program: BESSCC Catalogue Id: ABBM_v1_0 Nature of problem The BESSCC subroutine calculates the modified Bessel functions Imu(z) and Kmu(z) (and derivatives) for complex argument z and a sequence of real orders mu,mu+1,...,mu+n-1 for integer N >/= 1. These functions arise in the solutions of potential problems in spherical and cylindrical coordinates. They can also be used to calculate ordinary Bessels Jmu(z), Ymu(z), spherical Bessels Jmu(z), Ymu(z), Kelvin and Airy functions. CORRECTION SUMMARY: Vol:Year:Page 159:2004:243 "000A CORRECTION 20/04/04" "Modified Bessel functions Imu(z) and Kmu(z) of real order and complex argument, to selected accuracy." I.J. Thompson Note: correction instructions are contained in source code Versions of this program held in the CPC repository in Mendeley Data ABBM_v1_0; BESSCC; 10.1016/0010-4655(87)90111-1 This program has been imported from the CPC Program Library held at Queen's University Belfast (1969-2019)