```/* nag_tsa_arma_roots (g13dxc) Example Program.
*
* NAGPRODCODE Version.
*
* Copyright 2016 Numerical Algorithms Group.
*
* Mark 26, 2016.
*/

#include <stdio.h>
#include <nag.h>
#include <nag_stdlib.h>
#include <nagg13.h>

int main(void)
{
/* Scalars */
Integer exit_status, i, ip, k, npar;
NagError fail;

/* Arrays */
double *par = 0, *ri = 0, *rmod = 0, *rr = 0;

INIT_FAIL(fail);

exit_status = 0;

printf("nag_tsa_arma_roots (g13dxc) Example Program Results\n");

/* Skip heading in data file */
scanf("%*[^\n] ");
scanf("%" NAG_IFMT "%" NAG_IFMT "%*[^\n] ", &k, &ip);

if (k > 0 && ip > 0) {
/* Allocate arrays */
if (!(par = NAG_ALLOC(k * k * ip, double)) ||
!(ri = NAG_ALLOC(k * ip, double)) ||
!(rmod = NAG_ALLOC(k * ip, double)) ||
!(rr = NAG_ALLOC(k * ip, double)))
{
printf("Allocation failure\n");
exit_status = -1;
goto END;
}

/* Read the AR (or MA) parameters */
npar = ip * k * k;
for (i = 1; i <= npar; ++i)
scanf("%lf", &par[i - 1]);
scanf("%*[^\n] ");

/* nag_tsa_arma_roots (g13dxc).
* Calculates the zeros of a vector autoregressive (or
* moving average) operator
*/
nag_tsa_arma_roots(k, ip, par, rr, ri, rmod, &fail);
if (fail.code != NE_NOERROR) {
printf("Error from nag_tsa_arma_roots (g13dxc).\n%s\n", fail.message);
exit_status = 1;
goto END;
}
printf("\n");
printf("        Eigenvalues       Moduli\n");
printf("        -----------       ------\n");
for (i = 1; i <= k * ip; ++i) {
if (ri[i - 1] >= 0.0)
printf("%10.3f  + %6.3f i  %8.3f\n", rr[i - 1], ri[i - 1],
rmod[i - 1]);
else
printf("%10.3f  - %6.3f i  %8.3f\n", rr[i - 1], -ri[i - 1],
rmod[i - 1]);
}
}
else
printf(" Either k or ip is out of range\n");

END:
NAG_FREE(par);
NAG_FREE(ri);
NAG_FREE(rmod);
NAG_FREE(rr);

return exit_status;
}
```