! D01FC_P0W_F Example Program Text
! Mark 30.2 Release. NAG Copyright 2024.
Module d01fc_p0w_fe_mod
! .. Use Statements ..
Use iso_c_binding, Only: c_ptr
Use nag_library, Only: nag_wp
! .. Implicit None Statement ..
Implicit None
! .. Accessibility Statements ..
Private
Public :: f
! .. Parameters ..
Integer, Parameter, Public :: ndim = 4, nout = 6
Integer, Parameter, Public :: maxpts = 1000*ndim
Integer, Parameter, Public :: lenwrk = (ndim+2)*(1+maxpts/(2**ndim &
+2*ndim*ndim+2*ndim+1))
Contains
Subroutine f(ad_handle,ndim,z,fz,iuser,ruser)
! .. Scalar Arguments ..
Type (c_ptr), Intent (Inout) :: ad_handle
Real (Kind=nag_wp), Intent (Out) :: fz
Integer, Intent (In) :: ndim
! .. Array Arguments ..
Real (Kind=nag_wp), Intent (Inout) :: ruser(*)
Real (Kind=nag_wp), Intent (In) :: z(ndim)
Integer, Intent (Inout) :: iuser(*)
! .. Local Scalars ..
Real (Kind=nag_wp) :: f1, f2, f3
! .. Intrinsic Procedures ..
Intrinsic :: exp
! .. Executable Statements ..
f1 = ruser(1)*z(1)*z(3)*z(3)
f2 = ruser(2)*z(1)*z(3)
f2 = exp(f2)
f3 = ruser(3) + z(2) + z(4)
f3 = f3*f3
fz = f1*f2/f3
Return
End Subroutine f
End Module d01fc_p0w_fe_mod
Program d01fc_p0w_fe
! D01FC_P0W_F Example Main Program
! .. Use Statements ..
Use d01fc_p0w_fe_mod, Only: f, lenwrk, maxpts, ndim, nout
Use iso_c_binding, Only: c_ptr
Use nagad_library, Only: d01fc_p0w_f
Use nag_library, Only: nag_wp
! .. Implicit None Statement ..
Implicit None
! .. Local Scalars ..
Type (c_ptr) :: ad_handle
Real (Kind=nag_wp) :: acc, eps, finval
Integer :: ifail, minpts
! .. Local Arrays ..
Real (Kind=nag_wp), Allocatable :: a(:), b(:), work(:)
Real (Kind=nag_wp) :: ruser(3)
Integer :: iuser(1)
! .. Executable Statements ..
Write (nout,*) 'D01FC_P0W_F Example Program Results'
Allocate (a(ndim),b(ndim),work(lenwrk))
a(1:ndim) = 0.0E0_nag_wp
b(1:ndim) = 1.0E0_nag_wp
eps = 0.0001E0_nag_wp
minpts = 0
ruser(1) = 4.0_nag_wp
ruser(2) = 2.0_nag_wp
ruser(3) = 1.0_nag_wp
! Call the passive routine
ifail = 0
Call d01fc_p0w_f(ad_handle,ndim,a,b,minpts,maxpts,f,eps,acc,lenwrk,work, &
finval,iuser,ruser,ifail)
Write (nout,99999) ' Solution, x =', finval
99999 Format (1X,A,1X,F12.5)
End Program d01fc_p0w_fe