```/* nag_mv_discrim (g03dac) Example Program.
*
* NAGPRODCODE Version.
*
* Copyright 2016 Numerical Algorithms Group.
*
* Mark 26, 2016.
*
*/

#include <nag.h>
#include <stdio.h>
#include <nag_stdlib.h>
#include <nagg03.h>

#define GMEAN(I, J) gmean[(I) *tdgmean + J]
#define X(I, J)     x[(I) *tdx + J]
int main(void)
{
Integer exit_status = 0, i, *ing = 0, *isx = 0, j, m, n, ng, *nig = 0, nvar,
tdgmean;
Integer tdx;
NagError fail;
char weight[2];
double *det = 0, df, *gc = 0, *gmean = 0, sig, stat, *wt = 0, *wtptr = 0;
double *x = 0;

INIT_FAIL(fail);

printf("nag_mv_discrim (g03dac) Example Program Results\n\n");

/* Skip headings in data file */
scanf("%*[^\n]");
scanf("%" NAG_IFMT "", &n);
scanf("%" NAG_IFMT "", &m);
scanf("%" NAG_IFMT "", &nvar);
scanf("%" NAG_IFMT "", &ng);
scanf("%1s", weight);
if (n >= 1 && nvar >= 1 && m >= nvar && ng >= 2) {
if (!(det = NAG_ALLOC(ng, double)) ||
!(gc = NAG_ALLOC((ng + 1) * nvar * (nvar + 1) / 2, double)) ||
!(gmean = NAG_ALLOC(ng * nvar, double)) ||
!(wt = NAG_ALLOC(n, double)) ||
!(x = NAG_ALLOC(n * m, double)) ||
!(ing = NAG_ALLOC(n, Integer)) ||
!(isx = NAG_ALLOC(m, Integer)) || !(nig = NAG_ALLOC(ng, Integer)))
{
printf("Allocation failure\n");
exit_status = -1;
goto END;
}
tdgmean = nvar;
tdx = m;
}
else {
printf("Invalid n or nvar or m or ng.\n");
exit_status = 1;
return exit_status;
}
if (*weight == 'W') {
for (i = 0; i < n; ++i) {
for (j = 0; j < m; ++j)
scanf("%lf", &X(i, j));
scanf("%" NAG_IFMT "", &ing[i]);
scanf("%lf", &wt[i]);
}
wtptr = wt;
}
else {
for (i = 0; i < n; ++i) {
for (j = 0; j < m; ++j)
scanf("%lf", &X(i, j));
scanf("%" NAG_IFMT "", &ing[i]);
}
}
for (j = 0; j < m; ++j)
scanf("%" NAG_IFMT "", &isx[j]);

/* nag_mv_discrim (g03dac).
* Test for equality of within-group covariance matrices
*/
nag_mv_discrim(n, m, x, tdx, isx, nvar, ing, ng, wtptr, nig,
gmean, tdgmean, det, gc, &stat, &df, &sig, &fail);
if (fail.code != NE_NOERROR) {
printf("Error from nag_mv_discrim (g03dac).\n%s\n", fail.message);
exit_status = 1;
goto END;
}

printf("\nGroup means\n\n");
for (i = 0; i < ng; ++i) {
for (j = 0; j < nvar; ++j)
printf("%10.4f", GMEAN(i, j));
printf("\n");
}
printf("\nLOG of determinants\n\n");
for (j = 0; j < ng; ++j)
printf("%10.4f", det[j]);
printf("\n\n%s%7.4f\n", "stat = ", stat);
printf("%s%7.4f\n", "  df = ", df);
printf("%s%7.4f\n", " sig = ", sig);
END:
NAG_FREE(det);
NAG_FREE(gc);
NAG_FREE(gmean);
NAG_FREE(wt);
NAG_FREE(x);
NAG_FREE(ing);
NAG_FREE(isx);
NAG_FREE(nig);
return exit_status;
}
```