GRASS GIS 8 Programmer's Manual 8.3.2(2024)-exported
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dagstndn.c
Go to the documentation of this file.
1#include <stdio.h>
2#include <stdlib.h>
3#include <math.h>
4#include "local_proto.h"
5
6double *Cdhc_dagostino_d(double *x, int n)
7{
8 int i;
9 static double y[2];
10 double d, s, t = 0., *xcopy, m2, s1 = 0., s2, mn = 0.0;
11
12 if ((xcopy = (double *)malloc(n * sizeof(double))) == NULL) {
13 fprintf(stderr, "Memory allocation error\n");
14 exit(EXIT_FAILURE);
15 }
16
17 for (i = 0; i < n; ++i)
18 xcopy[i] = x[i];
19
20 qsort(xcopy, n, sizeof(double), Cdhc_dcmp);
21
22 for (i = 0; i < n; ++i) {
23 t += xcopy[i] * ((i + 1) - 0.5 * (n + 1));
24 mn += xcopy[i];
25 }
26
27 m2 = mn / n;
28 for (i = 0; i < n; ++i)
29 s1 += (xcopy[i] - m2) * (xcopy[i] - m2);
30
31 s2 = s1 / n;
32 s = sqrt(s2);
33 d = t / (n * n * s);
34
35 /* y[0] = (d - 1. / (2*sqrt (M_PI))) * sqrt ((double)n) / 0.02998598; */
36 y[0] = d;
37 y[1] = sqrt((double)n) * (y[0] - 0.28209479) / 0.02998598;
38
39#ifdef NOISY
40 fprintf(stdout, " TEST4 DAGN =%10.4f\n", y[0]);
41#endif /* NOISY */
42
43 return y;
44}
#define NULL
Definition ccmath.h:32
double * Cdhc_dagostino_d(double *x, int n)
Definition dagstndn.c:6
int Cdhc_dcmp(const void *i, const void *j)
Definition dcmp.c:1
double t
#define x