NAG Library Manual, Mark 28.7
```/* nag_correg_coeffs_kspearman_miss_case (g02brc) Example Program.
*
* Copyright 2022 Numerical Algorithms Group.
*
* Mark 28.7, 2022.
*/

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

#define X(I, J) x[(I)*tdx + J]
#define CORR(I, J) corr[(I)*tdcorr + J]

int main(void) {
Integer exit_status = 0, i, j, m, n, *sobs = 0, *sobsptr, *svar = 0;
Integer *svarptr;
Integer tdcorr, tdx;
NagError fail;
char s, w;
double *corr = 0, *x = 0;

INIT_FAIL(fail);

printf(
"nag_correg_coeffs_kspearman_miss_case (g02brc) Example Program Results\n");

/* Skip heading in data file */
scanf(" %*[^\n]");

scanf("%" NAG_IFMT "%" NAG_IFMT "\n", &m, &n);
if (m >= 2 && n >= 2) {
if (!(x = NAG_ALLOC(n * m, double)) || !(corr = NAG_ALLOC(m * m, double)) ||
!(svar = NAG_ALLOC(m, Integer)) || !(sobs = NAG_ALLOC(n, Integer))) {
printf("Allocation failure\n");
exit_status = -1;
goto END;
}
tdx = m;
tdcorr = m;
} else {
printf("Invalid m or n.\n");
exit_status = 1;
return exit_status;
}
for (i = 0; i < n; i++)
for (j = 0; j < m; j++)
scanf("%lf", &X(i, j));

/* Read flag specifying if svar is to be supplied */
scanf(" %c", &s);
if (s == 'S' || s == 's') {
/* Assign pointer to svar and read in values for svar */
svarptr = svar;
for (i = 0; i < m; i++)
scanf("%" NAG_IFMT "", &svar[i]);
} else {
/* Assign pointer to NULL and discard rest of line */
svarptr = (Integer *)0;
/* skip rest of line */
scanf(" %*[^\n]");
}

/* Read flag specifying if sobs is to be supllied */
scanf(" %c", &w);
if (w == 'W' || w == 'w') {
/* Assign pointer to sobs and read in values for sobs */
sobsptr = sobs;
for (i = 0; i < n; i++)
scanf("%" NAG_IFMT "", &sobs[i]);
} else {
/* Assign pointer to NULL and discard rest of line */
sobsptr = (Integer *)0;
/* skip rest of line */
scanf(" %*[^\n]");
}

/* Calculate the Kendall and Spearman coefficients */
/* nag_correg_coeffs_kspearman_miss_case (g02brc).
* Kendall and/or Spearman non-parametric rank correlation
* coefficients, allows variables and observations to be
* selectively disregarded
*/
nag_correg_coeffs_kspearman_miss_case(n, m, x, tdx, svarptr, sobsptr, corr,
tdcorr, &fail);
if (fail.code != NE_NOERROR) {
printf("Error from nag_correg_coeffs_kspearman_miss_case (g02brc).\n%s\n",
fail.message);
exit_status = 1;
goto END;
}

printf("\nCorrelation coefficients:\n\n");
for (i = 0; i < m; i++) {
for (j = 0; j < m; j++)
printf("%8.5f ", CORR(i, j));
printf("\n");
}
END:
NAG_FREE(x);
NAG_FREE(corr);
NAG_FREE(svar);
NAG_FREE(sobs);
return exit_status;
}
```