program main

!*****************************************************************************80
!
!! TOMS179_PRB tests TOMS179.
!
!  Modified:
!
!    30 January 2006
!
!  Author:
!
!    John Burkardt
!
  implicit none

  call timestamp ( )

  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) 'TOMS179_PRB'
  write ( *, '(a)' ) '  FORTRAN90 version'
  write ( *, '(a)' ) '  Test TOMS algorithm 179, to evaluate'
  write ( *, '(a)' ) '  the modified Beta function.'

  call test01
  call test02

  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) 'TOMS179_PRB'
  write ( *, '(a)' ) '  Normal end of execution.'

  write ( *, '(a)' ) ' '
  call timestamp ( )

  stop
end
subroutine test01

!*****************************************************************************80
!
!! TEST01 tests ALOGAM.
!
!  Modified:
!
!    30 January 2006
!
!  Author:
!
!    John Burkardt
!
  implicit none

  real    ( kind = 8 ) alogam
  real    ( kind = 8 ) fx
  real    ( kind = 8 ) fx2
  integer ( kind = 4 ) ifault
  integer ( kind = 4 ) n_data
  real    ( kind = 8 ) x

  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) 'TEST01'
  write ( *, '(a)' ) '  Test ALOGAM, which estimates the logarithm'
  write ( *, '(a)' ) '  of the Gamma function.'
  write ( *, '(a)' ) ' '
  write ( *, '(a,a)' ) '      X         Exact Value               ', &
    'Computed                Diff'
  write ( *, '(a)' ) ' '

  n_data = 0

  do

    call gamma_log_values ( n_data, x, fx )

    if ( n_data <= 0 ) then
      exit
    end if

    fx2 = alogam ( x, ifault )

    write ( *, '(2x,f8.4,2x,g24.16,2x,g24.16,2x,g10.4)' ) &
      x, fx, fx2, abs ( fx - fx2 )

  end do

  return
end
subroutine test02

!*****************************************************************************80
!
!! TEST02 tests MDBETA.
!
!  Modified:
!
!    30 January 2006
!
!  Author:
!
!    John Burkardt
!
  implicit none

  real    ( kind = 8 ) fx
  real    ( kind = 8 ) fx2
  integer ( kind = 4 ) ier
  integer ( kind = 4 ) n_data
  real    ( kind = 8 ) p
  real    ( kind = 8 ) q
  real    ( kind = 8 ) x

  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) 'TEST02'
  write ( *, '(a)' ) '  Test MDBETA, which estimates the value of'
  write ( *, '(a)' ) '  the modified Beta function.'
  write ( *, '(a)' ) ' '
  write ( *, '(a,a)' ) '      X         P         Q         ', &
    'Exact Value               Computed                Diff'
  write ( *, '(a)' ) ' '

  n_data = 0

  do

    call beta_cdf_values ( n_data, p, q, x, fx )

    if ( n_data <= 0 ) then
      exit
    end if

    call mdbeta ( x, p, q, fx2, ier )

    write ( *, &
      '(2x,f8.4,2x,f8.4,2x,f8.4,2x,g24.16,2x,g24.16,2x,g10.4)' ) &
      x, p, q, fx, fx2, abs ( fx - fx2 )

  end do

  return
end