/* nag_matop_real_gen_matrix_frcht_exp (f01jhc) Example Program. * * Copyright 2013 Numerical Algorithms Group. * * Mark 24, 2013. */ #include #include #include #include #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"); /* Skip heading in data file */ scanf("%*[^\n] "); /* Read in the problem size */ scanf("%ld%*[^\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; }