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#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;
}
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