/* nag_matop_real_gen_matrix_fun_std (f01ekc) Example Program. * * Copyright 2011, Numerical Algorithms Group. * * Mark 23, 2011. */ #include #include #include #include #include #include int main(void) { /* Scalars */ Integer exit_status = 0; Integer i, j, n, pda; double imnorm; /* Arrays */ double *a = 0; char nag_enum_arg[100]; /* Nag Types */ Nag_OrderType order; Nag_MatFunType fun; NagError fail; INIT_FAIL(fail); #ifdef NAG_COLUMN_MAJOR #define A(I, J) a[(J-1)*pda + I-1] order = Nag_ColMajor; #else #define A(I, J) a[(I-1)*pda + J-1] order = Nag_RowMajor; #endif /* Output preamble */ printf("nag_matop_real_gen_matrix_fun_std (f01ekc) "); printf("Example Program Results\n\n"); /* Skip heading in data file */ scanf("%*[^\n]"); /* Read in the problem size and the required function */ scanf("%ld%s%*[^\n]", &n, nag_enum_arg); pda = n; if (!(a = NAG_ALLOC((pda)*(n), double))) { printf("Allocation failure\n"); exit_status = -1; goto END; } /* * nag_enum_name_to_value(x04nac) * Converts Nag enum member name to value */ fun = (Nag_MatFunType) nag_enum_name_to_value(nag_enum_arg); /* Read in the matrix a from data file */ for (i = 1; i <= n; i++) for (j = 1; j <= n; j++) scanf("%lf", &A(i,j)); scanf("%*[^\n]"); /* Find the matrix function using * nag_matop_real_gen_matrix_fun_std (f01ekc) * Real matrix function */ nag_matop_real_gen_matrix_fun_std (order, fun, n, a, pda, &imnorm, &fail); if (fail.code != NE_NOERROR) { printf("Error from nag_matop_real_gen_matrix_fun_std (f01ekc)\n%s\n", fail.message); exit_status = 1; goto END; } if (fabs(imnorm) > pow(nag_machine_precision,0.8)) { printf("\nWARNING: the error estimate returned in imnorm is larger than" " expected;\n"); printf(" the matrix solution printed below is suspect:\n"); printf(" imnorm = %13.4e.\n\n", imnorm); } /* Print solution 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, n, "f(A)", NULL, &fail); if (fail.code != NE_NOERROR) { printf("Error from nag_gen_real_mat_print (x04cac)\n%s\n", fail.message); exit_status = 2; goto END; } END: if (a) NAG_FREE(a); return exit_status; }