/* nag_ztptrs (f07usc) Example Program. * * Copyright 2001 Numerical Algorithms Group. * * Mark 7, 2001. */ #include #include #include #include #include int main(void) { /* Scalars */ Integer ap_len, i, j, n, nrhs, pdb; Integer exit_status = 0; Nag_UploType uplo; NagError fail; Nag_OrderType order; /* Arrays */ char nag_enum_arg[40]; Complex *ap = 0, *b = 0; #ifdef NAG_COLUMN_MAJOR #define A_UPPER(I, J) ap[J*(J-1)/2 + I - 1] #define A_LOWER(I, J) ap[(2*n-J)*(J-1)/2 + I - 1] #define B(I, J) b[(J-1)*pdb + I - 1] order = Nag_ColMajor; #else #define A_LOWER(I, J) ap[I*(I-1)/2 + J - 1] #define A_UPPER(I, J) ap[(2*n-I)*(I-1)/2 + J - 1] #define B(I, J) b[(I-1)*pdb + J - 1] order = Nag_RowMajor; #endif INIT_FAIL(fail); printf("nag_ztptrs (f07usc) Example Program Results\n\n"); /* Skip heading in data file */ scanf("%*[^\n] "); scanf("%ld%ld%*[^\n] ", &n, &nrhs); ap_len = n * (n + 1)/2; #ifdef NAG_COLUMN_MAJOR pdb = n; #else pdb = nrhs; #endif /* Allocate memory */ if (!(ap = NAG_ALLOC(ap_len, Complex)) || !(b = NAG_ALLOC(n * nrhs, Complex))) { printf("Allocation failure\n"); exit_status = -1; goto END; } /* Read A and B from data file */ scanf(" %s%*[^\n] ", nag_enum_arg); /* nag_enum_name_to_value(x04nac). * Converts NAG enum member name to value */ uplo = (Nag_UploType) nag_enum_name_to_value(nag_enum_arg); if (uplo == Nag_Upper) { for (i = 1; i <= n; ++i) { for (j = i; j <= n; ++j) scanf(" ( %lf , %lf )", &A_UPPER(i, j).re, &A_UPPER(i, j).im); } scanf("%*[^\n] "); } else { for (i = 1; i <= n; ++i) { for (j = 1; j <= i; ++j) scanf(" ( %lf , %lf )", &A_LOWER(i, j).re, &A_LOWER(i, j).im); } scanf("%*[^\n] "); } for (i = 1; i <= n; ++i) { for (j = 1; j <= nrhs; ++j) scanf(" ( %lf , %lf )", &B(i, j).re, &B(i, j).im); } scanf("%*[^\n] "); /* Compute solution */ /* nag_ztptrs (f07usc). * Solution of complex triangular system of linear * equations, multiple right-hand sides, packed storage */ nag_ztptrs(order, uplo, Nag_NoTrans, Nag_NonUnitDiag, n, nrhs, ap, b, pdb, &fail); if (fail.code != NE_NOERROR) { printf("Error from nag_ztptrs (f07usc).\n%s\n", fail.message); exit_status = 1; goto END; } /* Print solution */ /* nag_gen_complx_mat_print_comp (x04dbc). * Print complex general matrix (comprehensive) */ fflush(stdout); nag_gen_complx_mat_print_comp(order, Nag_GeneralMatrix, Nag_NonUnitDiag, n, nrhs, b, pdb, Nag_BracketForm, "%7.4f", "Solution(s)", Nag_IntegerLabels, 0, Nag_IntegerLabels, 0, 80, 0, 0, &fail); if (fail.code != NE_NOERROR) { printf("Error from nag_gen_complx_mat_print_comp (x04dbc).\n%s\n", fail.message); exit_status = 1; goto END; } END: if (ap) NAG_FREE(ap); if (b) NAG_FREE(b); return exit_status; }