```/* nag_rand_copula_clayton (g05rhc) Example Program.
*
* Copyright 2014 Numerical Algorithms Group.
*
* Mark 9, 2009.
*/
/* Pre-processor includes */
#include <stdio.h>
#include <math.h>
#include <nag.h>
#include <nag_stdlib.h>
#include <nagg05.h>

#define X(I, J) x[order == Nag_ColMajor?((J-1)*pdx + I-1):((I-1)*pdx + J-1)]

int main(void)
{
/* Integer scalar and array declarations */
Integer       exit_status = 0;
Integer       i, j, lstate, pdx, sdx;
Integer       *state = 0;

/* Double scalar and array declarations */
double        *x = 0;

/* NAG structures */
NagError      fail;

/* Use row major order */
Nag_OrderType order = Nag_RowMajor;

/* Set the number of variables and variates */
Integer       n = 13, m = 4;

/* Choose the base generator */
Nag_BaseRNG   genid = Nag_Basic;
Integer       subid = 0;

/* Set the seed */
Integer       seed[] = { 1762543 };
Integer       lseed = 1;

/* Set the theta parameter value */
double        theta = 1.3e0;

/* Initialise the error structure */
INIT_FAIL(fail);

printf(
"nag_rand_copula_clayton (g05rhc) Example Program Results\n\n");

/* Get the length of the state array */
lstate = -1;
nag_rand_init_repeatable(genid, subid, seed, lseed, state, &lstate, &fail);
if (fail.code != NE_NOERROR)
{
printf("Error from nag_rand_init_repeatable (g05kfc).\n%s\n",
fail.message);
exit_status = 1;
goto END;
}

/* Set matrix size and principal dimension according to storage order */
pdx = (order == Nag_ColMajor)?n:m;
sdx = (order == Nag_ColMajor)?m:n;

/* Allocate arrays */
if (!(x = NAG_ALLOC((pdx*sdx), double)) ||
!(state = NAG_ALLOC(lstate, Integer)))
{
printf("Allocation failure\n");
exit_status = -1;
goto END;
}

/* Initialise the generator to a repeatable sequence */
nag_rand_init_repeatable(genid, subid, seed, lseed, state, &lstate, &fail);
if (fail.code != NE_NOERROR)
{
printf("Error from nag_rand_init_repeatable (g05kfc).\n%s\n",
fail.message);
exit_status = 1;
goto END;
}

/* Generate variates */
nag_rand_copula_clayton(order, state, theta, n, m, x, pdx, sdx, &fail);
if (fail.code != NE_NOERROR)
{
printf("Error from nag_rand_copula_clayton (g05rhc).\n%s\n",
fail.message);
exit_status = 1;
goto END;
}

/* Display the results */
printf("Uniform variates with copula joint distrbution\n");
for (i = 1; i <= n; i++)
{
printf("  ");
for (j = 1; j <= m; j++)
printf("%9.6f%s", X(i, j), j < m?" ":"\n");
}

END:
NAG_FREE(x);
NAG_FREE(state);

return exit_status;
}
```