```/* nag_matop_real_gen_matrix_frcht_exp (f01jhc) Example Program.
*
* NAGPRODCODE Version.
*
* Copyright 2016 Numerical Algorithms Group.
*
* Mark 26, 2016.
*/
#include <nag.h>
#include <nag_stdlib.h>
#include <nagf01.h>
#include <nagx04.h>

#define A(I,J) a[J*pda + I]
#define E(I,J) e[J*pde + I]

int main(void)
{
/* Scalars */
Integer exit_status = 0;
Integer i, j, n;
Integer pda, pde;
/* Arrays */
double *a = 0;
double *e = 0;
/* Nag Types */
Nag_OrderType order = Nag_ColMajor;
NagError fail;

INIT_FAIL(fail);

/* Output preamble */
printf("nag_matop_real_gen_matrix_frcht_exp (f01jhc) ");
printf("Example Program Results\n\n");
fflush(stdout);

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

/* Read in the problem size */
scanf("%" NAG_IFMT "%*[^\n] ", &n);

pda = n;
if (!(a = NAG_ALLOC(pda * n, double)))
{
printf("Allocation failure\n");
exit_status = -1;
goto END;
}
pde = n;
if (!(e = NAG_ALLOC(pde * n, double)))
{
printf("Allocation failure\n");
exit_status = -2;
goto END;
}

/* Read in the matrix A from data file */
for (i = 0; i < n; i++)
for (j = 0; j < n; j++)
scanf("%lf", &A(i, j));
scanf("%*[^\n] ");

/* Read in the matrix E from data file */
for (i = 0; i < n; i++)
for (j = 0; j < n; j++)
scanf("%lf", &E(i, j));
scanf("%*[^\n] ");

/* Find exp(A) and L(A,E) using
* nag_matop_real_gen_matrix_frcht_exp (f01jhc)
* Frechet derivative of real matrix exponential
*/
nag_matop_real_gen_matrix_frcht_exp(n, a, pda, e, pde, &fail);
if (fail.code != NE_NOERROR) {
printf("Error from nag_matop_real_gen_matrix_frcht_exp (f01jhc)\n%s\n",
fail.message);
exit_status = 1;
goto END;
}

/* Print matrix exp(A) using nag_gen_real_mat_print (x04cac)
* Print real general matrix (easy-to-use)
*/
nag_gen_real_mat_print(order, Nag_GeneralMatrix, Nag_NonUnitDiag, n, n,
a, pda, "exp(A)", 0, &fail);
if (fail.code != NE_NOERROR) {
printf("Error from nag_gen_real_mat_print (x04cac)\n%s\n", fail.message);
exit_status = 2;
}

/* Print matrix L(A,E) using nag_gen_real_mat_print (x04cac)
* Print real general matrix (easy-to-use)
*/
nag_gen_real_mat_print(order, Nag_GeneralMatrix, Nag_NonUnitDiag, n, n,
e, pde, "L(A,E)", 0, &fail);
if (fail.code != NE_NOERROR) {
printf("Error from nag_gen_real_mat_print (x04cac)\n%s\n", fail.message);
exit_status = 3;
}

END:
NAG_FREE(a);
NAG_FREE(e);

return exit_status;
}
```