GRASS GIS 8 Programmer's Manual 8.2.0(2022)-exported
dagstndn.c
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1#include <stdio.h>
2#include <stdlib.h>
3#include <math.h>
4#include "local_proto.h"
5
6
7double *Cdhc_dagostino_d(double *x, int n)
8{
9 int i;
10 static double y[2];
11 double d, s, t = 0., *xcopy, m2, s1 = 0., s2, mn = 0.0;
12
13 if ((xcopy = (double *)malloc(n * sizeof(double))) == NULL) {
14 fprintf(stderr, "Memory allocation error\n");
15 exit(EXIT_FAILURE);
16 }
17
18 for (i = 0; i < n; ++i)
19 xcopy[i] = x[i];
20
21 qsort(xcopy, n, sizeof(double), Cdhc_dcmp);
22
23 for (i = 0; i < n; ++i) {
24 t += xcopy[i] * ((i + 1) - 0.5 * (n + 1));
25 mn += xcopy[i];
26 }
27
28 m2 = mn / n;
29 for (i = 0; i < n; ++i)
30 s1 += (xcopy[i] - m2) * (xcopy[i] - m2);
31
32 s2 = s1 / n;
33 s = sqrt(s2);
34 d = t / (n * n * s);
35
36 /* y[0] = (d - 1. / (2*sqrt (M_PI))) * sqrt ((double)n) / 0.02998598; */
37 y[0] = d;
38 y[1] = sqrt((double)n) * (y[0] - 0.28209479) / 0.02998598;
39
40#ifdef NOISY
41 fprintf(stdout, " TEST4 DAGN =%10.4f\n", y[0]);
42#endif /* NOISY */
43
44 return y;
45}
#define NULL
Definition: ccmath.h:32
double * Cdhc_dagostino_d(double *x, int n)
Definition: dagstndn.c:7
int Cdhc_dcmp(const void *i, const void *j)
Definition: dcmp.c:1
double t
#define x