using System;
using System.Runtime.InteropServices; 
using NagCFunctionsAPI;


public class NagE04Functions
{
  
  public static void nag_opt_simplex (int n, NAG_E04CCC_FUN funct,  double [] x,
                                      ref double fmin, ref Nag_E04_Opt options,
                                      ref CommStruct user_comm, ref NagError fail)
    {   
      NagFunctions.e04xxc(ref options);
      /*
        options.list=0;
        options.optim_tol=1.0e-3;
        options.print_level=1135;
        options.max_iter=100;
      */
      
      /*     options.outfile[0]  = 'd';
             options.outfile[1]  = '.';
             options.outfile[2]  = 'o';
      */
                               
      NagFunctions.e04ccc(n, funct, x, ref fmin, ref options, ref user_comm, ref fail);
    } 
  public static void Main()
    {

      NAG_E04CCC_FUN objfun = new  NAG_E04CCC_FUN (funct);
      int n=2;
      double [] x = new double [2];
      x[0] = 0.4;
      x[1] = -0.8;
      double fmin = 0.0;
      Nag_E04_Opt options = new Nag_E04_Opt();
      CommStruct user_comm = new CommStruct();
      NagError fail = new NagError();
      nag_opt_simplex(n, objfun, x, ref fmin, ref options, ref user_comm, ref fail);

      if (fail.code != 0)
        Console.WriteLine(fail.char_array);
    }
  public static void funct(int n, IntPtr xc_ptr, ref double objf, ref CommStruct comm)
    {
      double [] xc = new double[n];
      Marshal.Copy( xc_ptr, xc, 0, n );
          
      objf = Math.Exp(xc[0]) * (xc[0] * 4.0 * (xc[0] + xc[1]) +
                                xc[1] * 2.0 * (xc[1] + 1.0) + 1.0);
    }
}