/* F01EF_P0W_F C++ Header Example Program.
*
* Copyright 2023 Numerical Algorithms Group.
* Mark 29.1, 2023.
*/
#include <iostream>
#include <math.h>
#include <nag.h>
#include <nagad.h>
#include <nagx04.h>
#include <stdio.h>
#include <string>
using namespace std;
int main()
{
int exit_status = 0;
nag::ad::handle_t ad_handle;
Integer ifail = 0;
cout << "F01EF_P0W_F C++ Header Example Program Results\n\n";
// Skip heading in data file
string mystr;
getline(cin, mystr);
// Read problem size and number of right-hand-sides
Integer n;
cin >> n;
// Allocate arrays containing A and its factorized form, B
// and the solution X.
double *a = 0;
a = new double[n * n];
// Read the matrix A, register and copy
for (int i = 0; i < n; ++i)
{
for (int j = i; j < n; ++j)
{
Integer k = i + j * n;
cin >> a[k];
}
}
ifail = 0;
auto f = [&](nag::ad::handle_t & ad_handle,
Integer & iflag,
const Integer & n,
const double *x,
double *fx)
{
for (int i = 0; i < n; ++i)
{
fx[i] = cos(x[i]);
}
};
// Find f(A)
Integer iflag = 0;
nag::ad::f01ef(ad_handle, "U", n, a, n, f, iflag, ifail);
// Print f(A)
cout << endl;
NagError fail;
INIT_FAIL(fail);
x04cac(Nag_ColMajor, Nag_UpperMatrix, Nag_NonUnitDiag, n, n, a, n, " f(A)",
0, &fail);
delete[] a;
return exit_status;
}