#include <stdio.h>#include <stdlib.h>#include <math.h>#include "math_util.h"int n_fun, n_grad;main(){    long double epsilon, *x;    int n;    long double ex1_fun( long double * );    void ex1_dfun( long double *, long double * );    void cauchy( long double(*)(long double *),                  void(*)(long double *, long double *),                  long double *, int, long double );        n_fun = 0;	   n_grad = 0;	   n = 2;                  /* Number of unknown parameters */	   x = a1d_allo_dbl( n );  /* Allocate storage for the vector x */    x[0] = -2.9;            /* Initial guess */    x[1] = 2.0;	   epsilon = 1.0e-4;       /*Solution error */	    cauchy( ex1_fun, ex1_dfun, x, n, epsilon );        printf("\nSolution x: ");    print_vec_dbl( x, n );    printf("\n");    printf(" # of function evaluations: %d\n",n_fun);    printf(" # of gradient evaluations: %d\n",n_grad);    a1d_free_dbl( x );   /* Free storage for the vector x */}/*	Rosenbrock's function*/long double ex1_fun( x )long double *x;{   long double f;      n_fun++;      f = 100*(x[1]-x[0]*x[0])*(x[1]-x[0]*x[0]) +        (1.0-x[0])*(1.0-x[0]);      return( f );}void ex1_dfun( df, x )long double *df, *x;{   n_grad++;      df[0] = -400.0*x[0]*(x[1]-x[0]*x[0])-2.0*(1.0-x[0]);   df[1] = 200.0*(x[1]-x[0]*x[0]);}/****  Norm(grad f) <= epsSolution x:  1.000024e+00  1.000048e+00 # of function evaluations: 4208 # of gradient evaluations: 579 Solution time: 7.166667e+00*/