#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include "local_proto.h"


double *dmax_exp  (double *x, int n)
{
  static double y[2];
  double mean=0.0, zmax, tmax, *xcopy, t, z, fx;
  int i;

  if ((xcopy = (double *) malloc (n * sizeof (double))) == NULL)
  {
    fprintf (stderr, "Memory error in dmax_exp\n");
    exit (EXIT_FAILURE);
  }

  for (i = 0; i < n; ++i)
  {
    xcopy[i] = x[i];
    mean += x[i];
  }
  mean /=n;

  qsort (xcopy, n, sizeof (double), dcmp);

  for (i = 0; i < n; ++i)
  {
    fx = 1-exp(-xcopy[i]/mean);
    z = (double) (i+1) / (double) n - fx;
    t = fx - (double) i / (double) n;
    if (i == 0 || z > zmax)
      zmax = z;

    if (i == 0 || t > tmax)
      tmax = t;
  }

  y[0]=zmax;
  y[1]=tmax;

  free(xcopy);

  return y;
}
