/* F07FJ_P0W_F C++ Header Example Program.
*
* Copyright 2024 Numerical Algorithms Group.
* Mark 30.1, 2024.
*/
#include <iostream>
#include <dco.hpp>
#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 << "F07FJ_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 lower triangular matrix A, register and copy
double dd;
for (int i = 0; i < n; ++i)
{
for (int j = 0; j <= i; ++j)
{
int k = i + j * n;
cin >> a[k];
}
}
// Factorize the matrix A
ifail = 0;
nag::ad::f07fd(ad_handle, "L", n, a, n, ifail);
// Get the inverse of A
ifail = 0;
nag::ad::f07fj(ad_handle, "L", n, a, n, ifail);
// Print inverse
cout << endl;
NagError fail;
INIT_FAIL(fail);
x04cac(Nag_ColMajor, Nag_LowerMatrix, Nag_NonUnitDiag, n, n, a, n,
" Inverse", 0, &fail);
delete[] a;
return exit_status;
}