/* nag_zsytri (f07nwc) Example Program. * * Copyright 2001 Numerical Algorithms Group. * * Mark 7, 2001. */ #include #include #include #include #include int main(void) { /* Scalars */ Integer i, j, n, pda; Integer exit_status = 0; NagError fail; Nag_UploType uplo; Nag_MatrixType matrix; Nag_OrderType order; /* Arrays */ Integer *ipiv = 0; char nag_enum_arg[40]; Complex *a = 0; #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 INIT_FAIL(fail); printf("nag_zsytri (f07nwc) Example Program Results\n\n"); /* Skip heading in data file */ scanf("%*[^\n] "); scanf("%ld%*[^\n] ", &n); #ifdef NAG_COLUMN_MAJOR pda = n; #else pda = n; #endif /* Allocate memory */ if (!(ipiv = NAG_ALLOC(n, Integer)) || !(a = NAG_ALLOC(n * n, Complex))) { printf("Allocation failure\n"); exit_status = -1; goto END; } /* Read A from data file */ scanf(" %39s%*[^\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) { matrix = Nag_UpperMatrix; for (i = 1; i <= n; ++i) { for (j = i; j <= n; ++j) scanf(" ( %lf , %lf )", &A(i, j).re, &A(i, j).im); } scanf("%*[^\n] "); } else { matrix = Nag_LowerMatrix; for (i = 1; i <= n; ++i) { for (j = 1; j <= i; ++j) scanf(" ( %lf , %lf )", &A(i, j).re, &A(i, j).im); } scanf("%*[^\n] "); } /* Factorize A */ /* nag_zsytrf (f07nrc). * Bunch-Kaufman factorization of complex symmetric matrix */ nag_zsytrf(order, uplo, n, a, pda, ipiv, &fail); if (fail.code != NE_NOERROR) { printf("Error from nag_zsytrf (f07nrc).\n%s\n", fail.message); exit_status = 1; goto END; } /* Compute inverse of A */ /* nag_zsytri (f07nwc). * Inverse of complex symmetric matrix, matrix already * factorized by nag_zsytrf (f07nrc) */ nag_zsytri(order, uplo, n, a, pda, ipiv, &fail); if (fail.code != NE_NOERROR) { printf("Error from nag_zsytri (f07nwc).\n%s\n", fail.message); exit_status = 1; goto END; } /* Print inverse */ /* nag_gen_complx_mat_print_comp (x04dbc). * Print complex general matrix (comprehensive) */ fflush(stdout); nag_gen_complx_mat_print_comp(order, matrix, Nag_NonUnitDiag, n, n, a, pda, Nag_BracketForm, "%7.4f", "Inverse", 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: NAG_FREE(ipiv); NAG_FREE(a); return exit_status; }