import java.applet.*;
import java.awt.*;

public class Example4_13 extends Applet
{
 public double F(double[] x)
 {int i,n=x.length;
  double[] f=new double[n];
  double y;
  f[0]=3*x[0]+x[1]+2*x[2]*x[2]-3;
  f[1]=-3*x[0]+5*x[1]*x[1]+2*x[0]*x[2]-1;
  f[2]=25*x[0]*x[1]+20*x[2]+12;
  y=0;
  for(i=0;i<n;i++)y+=f[i]*f[i];
  y=Math.sqrt(y);
  return y;
 }

 public void Mmtcl(double[] x,double b,double eps)
 {int i,m,l=0,n=x.length;
  double[] x1=new double[n];
  double r,y=0,y1=0;
  y=F(x);
  while(y>eps&&l++<10000)
  { for(m=0;m<1000;m++)
    {for(i=0;i<n;i++){r=Math.random()*2*b-b;x1[i]=x[i]+r;}
     y1=F(x1);
     if(y1<y)break;}
     if(m==1000)b/=2;
     else
     {for(i=0;i<n;i++)x[i]=x1[i];
      y=y1;}
  }
  }

 public void paint(Graphics g)
 {double[] x={0,0,0};
  double[] f=new double[3];
  int i,n=x.length;
  double b=2,eps=1e-5;
  Mmtcl(x,b,eps);
  for(i=0;i<n;i++)g.drawString("X"+i+"="+x[i],10,20*i+20);
  f[0]=3*x[0]+x[1]+2*x[2]*x[2]-3;
  f[1]=-3*x[0]+5*x[1]*x[1]+2*x[0]*x[2]-1;
  f[2]=25*x[0]*x[1]+20*x[2]+12;
  for(i=0;i<n;i++)g.drawString("f"+i+"="+f[i],10,20*i+80);
  }
}