GRASS GIS 8 Programmer's Manual 8.3.2(2024)-exported
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cvmw2e.c
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1#include <stdio.h>
2#include <stdlib.h>
3#include <math.h>
4#include "local_proto.h"
5
6double *Cdhc_cramer_von_mises_exp(double *x, int n)
7{
8 static double y[2];
9 double *xcopy, mean = 0.0, fx, fn2, sum4 = 0.0;
10 int i;
11
12 if ((xcopy = (double *)malloc(n * sizeof(double))) == NULL) {
13 fprintf(stderr, "Memory error in Cdhc_cramer_von_mises_exp\n");
14 exit(EXIT_FAILURE);
15 }
16
17 for (i = 0; i < n; ++i) {
18 xcopy[i] = x[i];
19 mean += x[i];
20 }
21 mean /= n;
22
23 qsort(xcopy, n, sizeof(double), Cdhc_dcmp);
24
25 for (i = 0; i < n; ++i) {
26
27 /*-
28 a = (2 * i + 1) * log (fx);
29 b = (2 * i + 1) * (xcopy[n-i-1] * (-1.0 / mean));
30 sum3 += a + b;
31 */
32 fx = 1 - exp(xcopy[i] * (-1.0 / mean));
33 fn2 = (double)(2.0 * i + 1) / (2 * n);
34 sum4 += (fx - fn2) * (fx - fn2);
35 }
36
37 /*-
38 cvm = 1.0 / (n * 12) + sum4;
39 cvmod = cvm * (0.16 / n + 1.0);
40 */
41 y[0] = (1.0 / (n * 12) + sum4) * (0.16 / n + 1.0);
42
43#ifdef NOISY
44 fprintf(stdout, " TEST16 CVM(E) =%10.4f\n", y[0]);
45#endif /* NOISY */
46
47 free(xcopy);
48
49 return y;
50}
#define NULL
Definition ccmath.h:32
double * Cdhc_cramer_von_mises_exp(double *x, int n)
Definition cvmw2e.c:6
int Cdhc_dcmp(const void *i, const void *j)
Definition dcmp.c:1
#define x