GRASS GIS 8 Programmer's Manual 8.2.0(2022)-exported
cvmw2n.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_cramer_von_mises(double *x, int n)
8{
9 int i;
10 static double y[2];
11 double mean = 0.0, sdx = 0.0, fx, sqrt2, *xcopy;
12
13 sqrt2 = sqrt((double)2.0);
14 y[1] = 0.0;
15
16 if ((xcopy = (double *)malloc(n * sizeof(double))) == NULL) {
17 fprintf(stderr, "Memory error in Cdhc_cramer_von_mises\n");
18 exit(EXIT_FAILURE);
19 }
20
21 for (i = 0; i < n; ++i) {
22 xcopy[i] = x[i];
23 mean += x[i];
24 sdx += x[i] * x[i];
25 }
26 sdx = sqrt((n * sdx - mean * mean) / (n * (n - 1.0)));
27 mean /= n;
28
29 qsort(xcopy, n, sizeof(double), Cdhc_dcmp);
30
31 for (i = 0; i < n; ++i) {
32 fx = 0.5 + Cdhc_normp((xcopy[i] - mean) / sdx / sqrt2) / 2.0;
33 if (fx <= 1e-5)
34 fx = 1e-5;
35
36 if (fx >= 0.99999)
37 fx = 0.99999;
38
39 fx -= (2.0 * i + 1.0) / (2.0 * n);
40 y[1] += fx * fx;
41 }
42 y[1] += 1.0 / (double)(n * 12);
43 y[0] = y[1] * (0.5 / n + 1.0);
44
45#ifdef NOISY
46 fprintf(stdout, " TEST9 CVM(N) =%10.4f\n", y[0]);
47#endif /* NOISY */
48
49 free(xcopy);
50
51 return y;
52}
#define NULL
Definition: ccmath.h:32
double * Cdhc_cramer_von_mises(double *x, int n)
Definition: cvmw2n.c:7
int Cdhc_dcmp(const void *i, const void *j)
Definition: dcmp.c:1
double Cdhc_normp(double z)
Definition: normp.c:23
#define x