GRASS GIS 8 Programmer's Manual 8.2.1RC1(2022)-exported
cvmw2e.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_exp(double *x, int n)
8{
9 static double y[2];
10 double *xcopy, mean = 0.0, fx, fn2, sum4 = 0.0;
11 int i;
12
13 if ((xcopy = (double *)malloc(n * sizeof(double))) == NULL) {
14 fprintf(stderr, "Memory error in Cdhc_cramer_von_mises_exp\n");
15 exit(EXIT_FAILURE);
16 }
17
18 for (i = 0; i < n; ++i) {
19 xcopy[i] = x[i];
20 mean += x[i];
21 }
22 mean /= n;
23
24 qsort(xcopy, n, sizeof(double), Cdhc_dcmp);
25
26 for (i = 0; i < n; ++i) {
27
28 /*-
29 a = (2 * i + 1) * log (fx);
30 b = (2 * i + 1) * (xcopy[n-i-1] * (-1.0 / mean));
31 sum3 += a + b;
32 */
33 fx = 1 - exp(xcopy[i] * (-1.0 / mean));
34 fn2 = (double)(2.0 * i + 1) / (2 * n);
35 sum4 += (fx - fn2) * (fx - fn2);
36 }
37
38 /*-
39 cvm = 1.0 / (n * 12) + sum4;
40 cvmod = cvm * (0.16 / n + 1.0);
41 */
42 y[0] = (1.0 / (n * 12) + sum4) * (0.16 / n + 1.0);
43
44#ifdef NOISY
45 fprintf(stdout, " TEST16 CVM(E) =%10.4f\n", y[0]);
46#endif /* NOISY */
47
48 free(xcopy);
49
50 return y;
51}
#define NULL
Definition: ccmath.h:32
double * Cdhc_cramer_von_mises_exp(double *x, int n)
Definition: cvmw2e.c:7
int Cdhc_dcmp(const void *i, const void *j)
Definition: dcmp.c:1
#define x