/* S15AB_A1W_F C++ Header Example Program.
*
* Copyright 2023 Numerical Algorithms Group.
* Mark 29.2, 2023.
*/
#include <dco.hpp>
#include <iostream>
#include <nag.h>
#include <nagad.h>
#include <stdio.h>
#include <string>
using namespace std;
int main()
{
int exit_status = 0;
// Input and output variables
nagad_a1w_w_rtype p, x;
cout << "S15AB_A1W_F C++ Header Example Program Results\n\n";
// Create AD tape
dco::ga1s<double>::global_tape = dco::ga1s<double>::tape_t::create();
x = -1.;
// Create AD configuration data object
Integer ifail = 0;
nag::ad::handle_t ad_handle;
cout << " x P(x) dP/dx\n";
cout.setf(ios::scientific, ios::floatfield);
cout.setf(ios::right);
cout.precision(4);
// Register x, i.e. differentiate w.r.t. x
dco::ga1s<double>::global_tape->register_variable(x);
// Call NAG AD Routine
ifail = 0;
nag::ad::s15ab(ad_handle, x, p, ifail);
// Reset adjoints, increment p, and evaluate adjoint of P w.r.t. x
dco::ga1s<double>::global_tape->zero_adjoints();
double inc = 1.0;
dco::derivative(p) += inc;
ifail = 0;
dco::ga1s<double>::global_tape->sparse_interpret() = true;
dco::ga1s<double>::global_tape->interpret_adjoint();
// Get derivative, dPdx and output values
double dPdx;
dPdx = dco::derivative(x);
cout.width(12);
cout << dco::value(x);
cout.width(12);
cout << dco::value(p);
cout.width(12);
cout << dPdx << endl;
dco::ga1s<double>::tape_t::remove(dco::ga1s<double>::global_tape);
return exit_status;
}