/* D01PA_P0W_F C++ Header Example Program.
*
* Copyright 2024 Numerical Algorithms Group.
* Mark 30.1, 2024.
*/
#include <iostream>
#include <dco.hpp>
#include <math.h>
#include <nag.h>
#include <nagad.h>
#include <stdio.h>
using namespace std;
int main()
{
// Scalars
int exit_status = 0;
Integer mxord = 5, ndim = 3, sdvert = 8, ldvert = 4;
cout << "D01PA_P0W_F C++ Header Example Program Results\n\n";
// Allocate memory
double *finvls = 0, *vert = 0, *vert_in = 0;
finvls = new double[mxord];
vert = new double[ldvert * sdvert];
for (int i = 0; i < ndim * ldvert; i++)
{
vert[i] = 0.0;
}
for (int i = 1; i < ndim * ldvert; i = i + ldvert + 1)
{
vert[i] = 1.0;
}
nag::ad::handle_t ad_handle;
cout << "\n Maxord Estimated Estimated Integrand\n";
cout << " value accuracy evaluations\n";
cout.setf(ios::scientific, ios::floatfield);
cout.precision(4);
Integer minord = 0, nevals = 1;
auto functn = [&](nag::ad::handle_t & ad_handle,
const Integer & ndim,
const double *x,
double & ret)
{
double tmp1;
// dco/c++ used here to perform AD of the following
tmp1 = x[0] + x[1] + x[2];
ret = exp(tmp1) * cos(tmp1);
};
for (Integer maxord = 1; maxord <= mxord; maxord++)
{
// Call the passive routine
double esterr;
Integer ifail = 0;
nag::ad::d01pa(ad_handle, ndim, vert, ldvert, sdvert, functn, minord,
maxord, finvls, esterr, ifail);
double finv_r = finvls[maxord - 1];
cout.width(5);
cout << maxord;
cout.width(15);
cout << finv_r;
cout.width(15);
cout << esterr;
cout.width(12);
cout << nevals << endl;
nevals = (nevals * (maxord + ndim + 1)) / maxord;
}
cout.setf(ios::right);
cout.precision(4);
cout << "\n Solution, I = ";
double ans_value = finvls[mxord - 1];
cout.width(12);
cout << ans_value << endl;
delete[] finvls;
delete[] vert;
return exit_status;
}