NAG Library Manual, Mark 27.3
```/* nag_interp_dim5_scat_shep (e01tmc) Example Program.
*
* Copyright 2021 Numerical Algorithms Group.
*
* Mark 27.3, 2021.
*/

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

#define X(I, J) x[I * 5 + J]
#define XE(I, J) xe[I * 5 + J]

int main(void) {
/* Scalars */
Integer exit_status, i, j, m, n, nq, nw, liq, lrq;
NagError fail;

/* Arrays */
double *f = 0, *q = 0, *qx = 0, *rq = 0, *xe = 0, *x = 0;
Integer *iq = 0;

exit_status = 0;

INIT_FAIL(fail);

printf("nag_interp_dim5_scat_shep (e01tmc) Example Program Results\n");

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

/* Input the number of nodes. */
scanf("%" NAG_IFMT "%*[^\n] ", &m);

/* Allocate memory */
lrq = 21 * m + 11;
liq = 2 * m + 1;
if (!(f = NAG_ALLOC(m, double)) || !(x = NAG_ALLOC(m * 5, double)) ||
!(rq = NAG_ALLOC(lrq, double)) || !(iq = NAG_ALLOC(liq, Integer))) {
printf("Allocation failure\n");
exit_status = -1;
goto END;
}

/* Input the data points X and F. */
for (i = 0; i < m; ++i) {
for (j = 0; j < 5; ++j) {
scanf("%lf", &X(i, j));
}
scanf("%lf%*[^\n] ", &f[i]);
}

/* Generate the interpolant. */
nq = 0;
nw = 0;

/* nag_interp_dim5_scat_shep (e01tmc).
* Interpolating functions, modified Shepard's method, five
* variables
*/
nag_interp_dim5_scat_shep(m, x, f, nw, nq, iq, rq, &fail);
if (fail.code != NE_NOERROR) {
printf("Error from nag_interp_dim5_scat_shep (e01tmc).\n%s\n",
fail.message);
exit_status = 1;
goto END;
}

/* Input the number of evaluation points. */
scanf("%" NAG_IFMT "%*[^\n] ", &n);

/* Allocate memory for nag_interp_dim5_scat_shep_eval (e01tnc) */
if (!(q = NAG_ALLOC(n, double)) || !(qx = NAG_ALLOC(n * 5, double)) ||
!(xe = NAG_ALLOC(n * 5, double))) {
printf("Allocation failure\n");
exit_status = -1;
goto END;
}

/* Input the evaluation points. */
for (i = 0; i < n; ++i) {
for (j = 0; j < 5; ++j) {
scanf("%lf", &XE(i, j));
}
scanf("%*[^\n] ");
}

/* nag_interp_dim5_scat_shep_eval (e01tnc).
* Evaluate interpolant and first derivatives computed by
* nag_interp_dim5_scat_shep (e01tmc).
*/
fail.print = Nag_TRUE;
nag_interp_dim5_scat_shep_eval(m, x, f, iq, rq, n, xe, q, qx, &fail);
if (fail.code != NE_NOERROR) {
printf("Error from nag_interp_dim5_scat_shep_eval (e01tnc).\n%s\n",
fail.message);
exit_status = 1;
goto END;
}

printf("\n Evaluation of interpolant at various (5D) points\n");
printf("\n%6s%30s%17s\n", " pt.no.", "point coordinates", "value");
for (i = 0; i < n; ++i)
printf("%5" NAG_IFMT "%8.2f%8.2f%8.2f%8.2f%8.2f%10.4f\n", i, XE(i, 0),
XE(i, 1), XE(i, 2), XE(i, 3), XE(i, 4), q[i]);

END:
NAG_FREE(f);
NAG_FREE(q);
NAG_FREE(qx);
NAG_FREE(rq);
NAG_FREE(xe);
NAG_FREE(x);
NAG_FREE(iq);

return exit_status;
}
```