miknb.f90

来自「数值计算和数值分析在Fortran下的特殊函数库,是数值计算的必备」· F90 代码 · 共 22 行

MODULE iknb_func
 
! From the book "Computation of Special Functions"
!      by Shanjie Zhang and Jianming Jin
!   Copyright 1996 by John Wiley & Sons, Inc.
! The authors state:
!   "However, we give permission to the reader who purchases this book
!    to incorporate any of these programs into his or her programs
!    provided that the copyright is acknowledged."
 
IMPLICIT NONE
INTEGER, PARAMETER  :: dp = SELECTED_REAL_KIND(12, 60)
 
CONTAINS
 

SUBROUTINE iknb(n,x,nm,bi,di,bk,dk)

!    ============================================================
!    Purpose: Compute modified Bessel functions In(x) and Kn(x),
!             and their derivatives
!    Input:   x --- Argument of In(x) and Kn(x) ( 0