/* E04AB_A1W_F C++ Header Example Program.
*
* Copyright 2019 Numerical Algorithms Group.
* Mark 27, 2019.
*/
#include <nag.h>
#include <stdio.h>
#include <math.h>
#include <nag.h>
#include <dco.hpp>
#include <nagad.h>
#include <stdio.h>
#include <math.h>
#include <nag_stdlib.h>
#include <iostream>
#include <string>
typedef double DCO_BASE_TYPE;
typedef dco::ga1s<DCO_BASE_TYPE> DCO_MODE;
typedef DCO_MODE::type DCO_TYPE;
typedef DCO_MODE::tape_t DCO_TAPE_TYPE;
static void NAG_CALL funct(void * &ad_handle,
const DCO_TYPE &xc,
DCO_TYPE &fc,
Integer iuser[],
DCO_TYPE ruser[])
{
fc = sin(ruser[0]* xc) / xc;
}
/* funct */
int main(void)
{
Integer exit_status = 0, max_fun;
Integer ifail;
DCO_TYPE a, b, e1, e2, f, x;
DCO_TYPE ruser[1];
Integer iuser[1];
iuser[1] = 0;
printf("E04AB_A1W_F C++ Header Example Program Results\n\n");
// Create AD tape
DCO_MODE::global_tape=DCO_TAPE_TYPE::create();
void *ad_handle = 0;
x10aa_a1w_f_(ad_handle,ifail);
/* For communication with user-supplied functions: */
ruser[0] = 1.;
/* e1 and e2 are set to zero so that nag_opt_one_var_func (e04abc) will
* reset them to their default values.
*/
e1 = 0.0;
e2 = 0.0;
/* The minimum is known to lie in the range (3.5, 5.0) */
a = 3.5;
b = 5.0;
/* Allow 30 calls of funct */
max_fun = 30;
/* nag_opt_one_var_func (e04abc).
* Minimizes a function of one variable, using function values only.
*/
DCO_MODE::global_tape->register_variable(ruser[0]);
e04ab_a1w_f_(ad_handle, funct, e1, e2, a, b, max_fun, x, f, iuser, ruser,
ifail);
dco::derivative(x) = 1.0;
DCO_MODE::global_tape->interpret_adjoint();
if (ifail != 0) {
printf("Error from nagad_opt_one_var_func_a1w (e04ab_a1w_f_)."
" %" NAG_IFMT "\n", ifail);
exit_status = 1;
}
else {
printf("The minimum lies in the interval %7.5f to %7.5f.\n",
dco::value(a), dco::value(b));
printf("Its estimated position is %7.5f,\n", dco::value(x));
printf("where the function value is %13.4e.\n", dco::value(f));
printf("%1" NAG_IFMT " function evaluations were required.\n", max_fun);
printf("dx/druser %26.16f\n", dco::derivative(ruser[0]));
}
// Remove computational data object and tape
x10ab_a1w_f_(ad_handle,ifail);
DCO_TAPE_TYPE::remove(DCO_MODE::global_tape);
return exit_status;
}