GRASS Programmer's Manual  6.5.svn(2014)-r66266
shapiro2.c
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1 #include <stdio.h>
2 #include <stdlib.h>
3 #include <math.h>
4 #include "local_proto.h"
5
6
7 /* this is actually the Weisberg-Bingham stat. I need to
8  OCR the constants and implment this correctly */
9
10 double *shapiro_francia(double *x, int n)
11 {
12  static double y[2];
13  double suma = 0.0, sumb = 0.0, sumc = 0.0, sumd = 0.0, z, *xcopy;
14  int i;
15
16  if ((xcopy = (double *)malloc(n * sizeof(double))) == NULL) {
17  fprintf(stderr, "Memory error in shapiro_francia\n");
18  exit(EXIT_FAILURE);
19  }
20
21  for (i = 0; i < n; ++i)
22  xcopy[i] = x[i];
23
24  qsort(xcopy, n, sizeof(double), dcmp);
25
26  for (i = 0; i < n; ++i) {
27  z = xinormal((i + 1 - 0.375) / (n + 0.25));
28  suma += z * xcopy[i];
29  sumb += z * z;
30  sumc += xcopy[i];
31  sumd += xcopy[i] * xcopy[i];
32  }
33
34  y[0] = suma * suma / sumb / (sumd - sumc * sumc / n);
35
36 #ifdef NOISY
37  fprintf(stdout, " TEST14 SF(N) =%10.4f\n", y[0]);
38 #endif /* NOISY */
39
40  free(xcopy);
41
42  return y;
43 } /* test14_ */
int dcmp(const void *i, const void *j)
Definition: dcmp.c:1
int y
Definition: plot.c:34
void * malloc(YYSIZE_T)
return NULL
Definition: dbfopen.c:1394
void free(void *)
double * shapiro_francia(double *x, int n)
Definition: shapiro2.c:10
double xinormal(double)
Definition: xinormal.c:5
int n