/* nag_sparse_nherm_sol (f11dsc) Example Program. * * Copyright 2011, Numerical Algorithms Group. * * Mark 23, 2011. */ #include #include #include #include int main(void) { /* Scalars */ Integer exit_status = 0; double omega, rnorm, tol; Integer i, itn, m, maxitn, n, nnz; /* Arrays */ Complex *a = 0, *b = 0, *x = 0; Integer *icol = 0, *irow = 0; char nag_enum_arg[40]; /* NAG types */ Nag_SparseNsym_Method method; Nag_SparseNsym_PrecType precon; NagError fail; INIT_FAIL(fail); printf("nag_sparse_nherm_sol (f11dsc) Example Program Results\n\n"); /* Skip heading in data file*/ scanf("%*[^\n]"); scanf("%ld%*[^\n]", &n); scanf("%ld%*[^\n]", &nnz); scanf("%s%*[^\n]", nag_enum_arg); /* nag_enum_name_to_value(x04nac). * Converts NAG enum member name to value */ method = (Nag_SparseNsym_Method) nag_enum_name_to_value(nag_enum_arg); scanf("%s%*[^\n]", nag_enum_arg); precon = (Nag_SparseNsym_PrecType) nag_enum_name_to_value(nag_enum_arg); scanf("%lf%*[^\n]", &omega); scanf("%ld%lf%ld%*[^\n]", &m, &tol, &maxitn); if ( !(a = NAG_ALLOC((nnz), Complex)) || !(b = NAG_ALLOC((n), Complex)) || !(x = NAG_ALLOC((n), Complex)) || !(icol = NAG_ALLOC((nnz), Integer)) || !(irow = NAG_ALLOC((nnz), Integer)) ) { printf("Allocation failure\n"); exit_status = -1; goto END; } /* Read the matrix A*/ for (i = 0; i < nnz; i++) scanf(" ( %lf , %lf ) %ld%ld%*[^\n] ", &a[i].re, &a[i].im, &irow[i], &icol[i]); /* Read rhs vector b and initial approximate solution x*/ for (i = 0; i < n; i++) scanf(" ( %lf , %lf ) ", &b[i].re, &b[i].im); scanf("%*[^\n]"); for (i = 0; i < n; i++) scanf(" ( %lf , %lf ) ", &x[i].re, &x[i].im); /* solve ax = b */ /* nag_sparse_nherm_sol(f11dsc). * Solution of complex sparse non-Hermitian linear system, RGMRES, CGS, * Bi-CGSTAB or TFQMR method, Jacobi or SSOR preconditioner Black Box. */ nag_sparse_nherm_sol(method, precon, n, nnz, a, irow, icol, omega, b, m, tol, maxitn, x, &rnorm, &itn, &fail); if (fail.code != NE_NOERROR) { printf("Error from nag_sparse_nherm_sol (f11dsc).\n%s\n", fail.message); exit_status = 1; goto END; } printf("Converged in%13ld iterations\n", itn); printf("Final residual norm = %11.3e\n\n", rnorm); /* Output x*/ printf("%14s\n","Solution"); for (i = 0; i < n; i++) printf("(%11.4e, %11.4e)\n", x[i].re, x[i].im); END: if (a) NAG_FREE(a); if (b) NAG_FREE(b); if (x) NAG_FREE(x); if (icol) NAG_FREE(icol); if (irow) NAG_FREE(irow); return exit_status; }