Program g01fe_a1w_fe
! G01FE_A1W_F Example Program Text
! Mark 30.1 Release. NAG Copyright 2024.
! .. Use Statements ..
Use iso_c_binding, Only: c_ptr
Use nagad_library, Only: g01fe_a1w_f, nagad_a1w_get_derivative, &
nagad_a1w_inc_derivative, &
nagad_a1w_ir_create => x10za_a1w_f, &
nagad_a1w_ir_interpret_adjoint_sparse, &
nagad_a1w_ir_register_variable, &
nagad_a1w_ir_remove, nagad_a1w_ir_zero_adjoints &
, nagad_a1w_w_rtype, x10aa_a1w_f, x10ab_a1w_f, &
Assignment (=)
Use nag_library, Only: nag_wp
! .. Implicit None Statement ..
Implicit None
! .. Parameters ..
Integer, Parameter :: nin = 5, nout = 6
! .. Local Scalars ..
Type (nagad_a1w_w_rtype) :: a, b, p, tol, x
Type (c_ptr) :: ad_handle
Real (Kind=nag_wp) :: ar, br, dxda, dxdb, dxdp, pr
Integer :: i, ifail, n
! .. Executable Statements ..
Write (nout,*) 'G01FE_A1W_F Example Program Results'
! Create AD tape
Call nagad_a1w_ir_create
! Skip heading in data file
Read (nin,*)
Read (nin,*) n
tol = 0.0_nag_wp
Write (nout,*)
Write (nout,*) ' deviates and derivatives'
Write (nout,*)
Write (nout,99998) 'p', 'a', 'b', 'x', 'dx/dp', 'dx/da', 'dx/db'
! Create AD configuration data object
ifail = 0
Call x10aa_a1w_f(ad_handle,ifail)
Do i = 1, n
Read (nin,*) pr, ar, br
p = pr
a = ar
b = br
! Register variables to differentiate w.r.t.
Call nagad_a1w_ir_register_variable(p)
Call nagad_a1w_ir_register_variable(a)
Call nagad_a1w_ir_register_variable(b)
ifail = 0
Call g01fe_a1w_f(ad_handle,p,a,b,tol,x,ifail)
Call nagad_a1w_ir_zero_adjoints
Call nagad_a1w_inc_derivative(x,1.0_nag_wp)
ifail = 0
Call nagad_a1w_ir_interpret_adjoint_sparse(ifail)
! Get derivatives
dxdp = nagad_a1w_get_derivative(p)
dxda = nagad_a1w_get_derivative(a)
dxdb = nagad_a1w_get_derivative(b)
Write (nout,99999) p%value, a%value, b%value, x%value, dxdp, dxda, &
dxdb
End Do
99999 Format (1X,1P,7E11.2)
99998 Format (1X,A4,3A11,A15,2A11)
! Remove computational data object and tape
Call x10ab_a1w_f(ad_handle,ifail)
Call nagad_a1w_ir_remove
End Program g01fe_a1w_fe