/* nag_sparse_nherm_fac (f11dnc) Example Program. * * Copyright 2011, Numerical Algorithms Group. * * Mark 23, 2011. */ #include #include #include #include int main(void) { /* Scalars */ Integer exit_status = 0; double dtol; Integer i, la, lfill, n, nnz, nnzc, npivm; /* Arrays */ Complex *a = 0; Integer *icol = 0, *idiag = 0, *ipivp = 0, *ipivq = 0, *irow = 0, *istr = 0; char nag_enum_arg[40]; /* NAG types */ Nag_SparseNsym_Piv pstrat; Nag_SparseNsym_Fact milu; NagError fail; INIT_FAIL(fail); printf("nag_sparse_nherm_fac (f11dnc) Example Program Results \n\n"); /* Skip heading in data file*/ scanf("%*[^\n] "); /* Read algorithmic parameters*/ scanf("%ld%*[^\n]", &n); scanf("%ld%*[^\n]", &nnz); scanf("%ld%lf%*[^\n]", &lfill, &dtol); scanf("%s%*[^\n]", nag_enum_arg); /* nag_enum_name_to_value(x04nac). * Converts NAG enum member name to value */ pstrat = (Nag_SparseNsym_Piv) nag_enum_name_to_value(nag_enum_arg); scanf("%s%*[^\n]", nag_enum_arg); milu = (Nag_SparseNsym_Fact) nag_enum_name_to_value(nag_enum_arg); la = 2 * nnz; if ( !(a = NAG_ALLOC((la), Complex)) || !(icol = NAG_ALLOC((la), Integer)) || !(idiag = NAG_ALLOC((n), Integer)) || !(ipivp = NAG_ALLOC((n), Integer)) || !(ipivq = NAG_ALLOC((n), Integer)) || !(irow = NAG_ALLOC((la), Integer)) || !(istr = NAG_ALLOC((n + 1), 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]); /* Calculate incomplete LU factorization */ /* nag_sparse_nherm_fac (f11dnc) * Complex sparse non-Hermitian linear systems, incomplete LU factorization */ nag_sparse_nherm_fac(n, nnz, a, la, irow, icol, lfill, dtol, pstrat, milu, ipivp, ipivq, istr, idiag, &nnzc, &npivm, &fail); if (fail.code != NE_NOERROR) { printf("Error from nag_sparse_nsym_fac (f11dac).\n%s\n", fail.message); exit_status = 1; goto END; } /* Output original matrix*/ printf(" Original Matrix\n n = %6ld\n", n); printf(" nnz = %6ld\n", nnz); for (i = 0; i < nnz; ++i) printf("%8ld (%16.4e, %16.4e) %8ld%8ld\n", i, a[i].re, a[i].im, irow[i], icol[i]); printf("\n"); /* Output details of the factorization*/ printf(" Factorization\n n = %6ld\n", n); printf(" nnz = %6ld\n", nnzc); printf(" npivm = %6ld\n", npivm); for (i = nnz; i < nnz + nnzc; ++i) printf("%8ld (%16.4e, %16.4e) %8ld%8ld\n", i, a[i].re,a[i].im, irow[i], icol[i]); printf("\n i ipivp[i] ipivq[i]\n"); /* */ for (i = 0; i < n; ++i) printf("%10ld%10ld%10ld\n", i, ipivp[i], ipivq[i]); END: if (a) NAG_FREE(a); if (icol) NAG_FREE(icol); if (idiag) NAG_FREE(idiag); if (ipivp) NAG_FREE(ipivp); if (ipivq) NAG_FREE(ipivq); if (irow) NAG_FREE(irow); if (istr) NAG_FREE(istr); return exit_status; }