Program g01gc_a1w_fe
! G01GC_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: g01gc_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 (c_ptr) :: ad_handle
Type (nagad_a1w_w_rtype) :: df, p, rlamda, tol, x
Real (Kind=nag_wp) :: dfr, dpdd, dpdr, dpdx, rr, xr
Integer :: i, ifail, maxit, n
! .. Local Arrays ..
Type (nagad_a1w_w_rtype), Allocatable :: dfv(:), rv(:), xv(:)
! .. Executable Statements ..
Write (nout,*) 'G01GC_A1W_F Example Program Results'
Write (nout,*)
! Create AD tape
Call nagad_a1w_ir_create
! Skip heading in data file
Read (nin,*)
Read (nin,*) n
Allocate (xv(n),dfv(n),rv(n))
! Read x values from data file
Do i = 1, n
Read (nin,*) xr, dfr, rr
xv(i) = xr
dfv(i) = dfr
rv(i) = rr
End Do
Write (nout,99999) 'x', 'df', 'rlamda', 'p', 'p''', 'df''', 'rlamda'''
99999 Format (1X,A5,A8,A10,A6,A11,A11,A11)
tol = 0.0E0_nag_wp
maxit = 100
! Create AD configuration data object
ifail = 0
Call x10aa_a1w_f(ad_handle,ifail)
Do i = 1, n
x = xv(i)
df = dfv(i)
rlamda = rv(i)
! Register variables to differentiate w.r.t.
Call nagad_a1w_ir_register_variable(x)
Call nagad_a1w_ir_register_variable(df)
Call nagad_a1w_ir_register_variable(rlamda)
! Calculate probability
ifail = 0
Call g01gc_a1w_f(ad_handle,x,df,rlamda,tol,maxit,p,ifail)
Call nagad_a1w_ir_zero_adjoints
Call nagad_a1w_inc_derivative(p,1.0_nag_wp)
ifail = 0
Call nagad_a1w_ir_interpret_adjoint_sparse(ifail)
! Get derivatives
dpdx = nagad_a1w_get_derivative(x)
dpdd = nagad_a1w_get_derivative(df)
dpdr = nagad_a1w_get_derivative(rlamda)
Write (nout,99998) x%value, df%value, rlamda%value, p%value, dpdx, &
dpdd, dpdr
End Do
99998 Format (1X,4(F7.2,1X),1P,3E10.2)
! Remove computational data object and tape
Call x10ab_a1w_f(ad_handle,ifail)
Call nagad_a1w_ir_remove
End Program g01gc_a1w_fe