mbeta.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 24 行

MODULE beta_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 beta(p, q, bt)

!    ==========================================
!    Purpose: Compute the beta function B(p,q)
!    Input :  p  --- Parameter  ( p > 0 )
!             q  --- Parameter  ( q > 0 )
!    Output:  BT --- B(p,q)
!    Routine called: GAMMA for computing