/* nag_matop_real_gen_matrix_cond_exp (f01jgc) Example Program. * * Copyright 2013 Numerical Algorithms Group. * * Mark 24, 2013. */ #include #include #include #include #define A(I,J) a[J*pda + I] int main(void) { /* Scalars */ Integer exit_status = 0; Integer i, j, n; Integer pda; double condea; /* Arrays */ double *a = 0; /* Nag Types */ Nag_OrderType order = Nag_ColMajor; NagError fail; INIT_FAIL(fail); /* Output preamble */ printf("nag_matop_real_gen_matrix_cond_exp (f01jgc) "); 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; } /* 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] "); /* Find exp(A) and the condition number using * nag_matop_real_gen_matrix_cond_exp (f01jgc) * Condition number for real matrix exponential */ nag_matop_real_gen_matrix_cond_exp(n, a, pda, &condea, &fail); if (fail.code != NE_NOERROR) { printf("Error from nag_matop_real_gen_matrix_cond_exp (f01jgc)\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 relative condition number estimate */ printf("Estimated relative condition number is: %7.2f\n", condea); END: NAG_FREE(a); return exit_status; }