g02ab_p0w_hcppe.cpp
Example description
/* G02AB_P0W_F C++ Header Example Program.
 *
 * Copyright 2020 Numerical Algorithms Group.
 * Mark 27.1, 2020.
 */

#include <nagad.h>
#include <nag.h>
#include <stdio.h>
#include <math.h>
#include <iostream>
#include <string>
using namespace std;

int main(void)
{

  /* Scalars */
  Integer exit_status = 0;

  cout << "G02AB_P0W_F C++ Example Program Results\n\n";

  void    *ad_handle = 0;
  Integer ifail = 0;

  // Skip heading in data file
  string  mystr;
  getline (cin, mystr);
  
  // Inputs from data file
  Integer n;
  double  alpha;
  cin >> n;
  cin >> mystr;
  cin >> alpha;
  Integer pdg = n;
  Integer pdx = n;

  double *g = 0, *w = 0, *x = 0;
  g = new double [n * n];
  w = new double [n];
  x = new double [n * n];

  /* Read in the matrix g */
  for (int i = 0; i < n; i++) {
    for (int j = 0; j < n; j++) {
      cin >> g[i+j*n];
      x[i+j*n] = 0.0;
    }
  }
  /* Read in the vector w */
  for (int i = 0; i < n; i++) {
    cin >> w[i];
  }

  /* Use the defaults for errtol, maxits and maxit */
  double  errtol = 0.0;
  Integer maxits = 0;
  Integer maxit = 0;

  double  nrmgrd;
  Integer feval, iter;
  g02ab_p0w_f_(ad_handle, g, pdg, n, "B", alpha, w, errtol,
               maxits, maxit, x, pdx, iter, feval,
               nrmgrd, ifail, 1);

  NagError  fail;
  INIT_FAIL(fail);
  x04cac(Nag_ColMajor,Nag_GeneralMatrix,Nag_NonUnitDiag,n,n,x,n,
         "     Nearest Correlation Matrix",0,&fail);

  cout.setf(ios::scientific,ios::floatfield);
  cout.precision(3);
  cout << endl;
  cout << " Number of Newton steps taken  : " << iter << "\n";
  cout << " Number of function evaluations: " << feval << "\n";
  cout << " alpha                         : " << alpha << endl;

  delete [] g;
  delete [] w;
  delete [] x;

  return exit_status;
}