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MueLu_EpetraOperator.cpp
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46 #include <Xpetra_Matrix.hpp>
47 #include <Xpetra_CrsMatrixWrap.hpp>
48 #include <Xpetra_BlockedCrsMatrix.hpp>
49 #include <Xpetra_EpetraMultiVector.hpp>
50 
51 #include "MueLu_EpetraOperator.hpp"
52 #include "MueLu_Level.hpp"
53 
54 #if defined(HAVE_MUELU_SERIAL) and defined(HAVE_MUELU_EPETRA)
55 
56 namespace MueLu {
57 
58 int EpetraOperator::ApplyInverse(const Epetra_MultiVector& X, Epetra_MultiVector& Y) const {
59  try {
60  // There is no rcpFromRef(const T&), so we need to do const_cast
61  const Xpetra::EpetraMultiVectorT<GO,NO> eX(rcpFromRef(const_cast<Epetra_MultiVector&>(X)));
62  Xpetra::EpetraMultiVectorT<GO,NO> eY(rcpFromRef(Y));
63  // Generally, we assume two different vectors, but AztecOO uses a single vector
64  if (X.Values() == Y.Values()) {
65  // X and Y point to the same memory, use an additional vector
66  RCP<Xpetra::EpetraMultiVectorT<GO,NO> > tmpY = Teuchos::rcp(new Xpetra::EpetraMultiVectorT<GO,NO>(eY.getMap(), eY.getNumVectors()));
67  // InitialGuessIsZero in MueLu::Hierarchy.Iterate() does not zero out components, it
68  // only assumes that user provided an already zeroed out vector
69  bool initialGuessZero = true;
70  tmpY->putScalar(0.0);
71  // apply one V-cycle as preconditioner
72  Hierarchy_->Iterate(eX, *tmpY, 1, initialGuessZero);
73  // deep copy solution from MueLu
74  eY.update(1.0, *tmpY, 0.0);
75  } else {
76  // X and Y point to different memory, pass the vectors through
77 
78  // InitialGuessIsZero in MueLu::Hierarchy.Iterate() does not zero out components, it
79  // only assumes that user provided an already zeroed out vector
80  bool initialGuessZero = true;
81  eY.putScalar(0.0);
82  Hierarchy_->Iterate(eX, eY, 1, initialGuessZero);
83  }
84 
85  } catch (std::exception& e) {
86  //TODO: error msg directly on std::cerr?
87  std::cerr << "Caught an exception in MueLu::EpetraOperator::ApplyInverse():" << std::endl
88  << e.what() << std::endl;
89  return -1;
90  }
91  return 0;
92 }
93 
94 const Epetra_Comm& EpetraOperator::Comm() const {
95  RCP<Matrix> A = Hierarchy_->GetLevel(0)->Get<RCP<Matrix> >("A");
96 
97  //TODO: This code is not pretty
98  RCP<Xpetra::BlockedCrsMatrix<SC, LO, GO, NO> > epbA = Teuchos::rcp_dynamic_cast<Xpetra::BlockedCrsMatrix<SC, LO, GO, NO> >(A);
99  if (epbA != Teuchos::null) {
100  RCP<const Xpetra::Matrix<SC, LO, GO, NO> > blockMat = epbA->getMatrix(0,0);
101  RCP<const Xpetra::CrsMatrixWrap<SC, LO, GO, NO> > blockCrsWrap = Teuchos::rcp_dynamic_cast<const Xpetra::CrsMatrixWrap<SC, LO, GO, NO> >(blockMat);
102  if (blockCrsWrap == Teuchos::null)
103  throw Exceptions::BadCast("MueLu::EpetraOperator::Comm(): Cast from block (0,0) to CrsMatrixWrap failed. Could be a block matrix. TODO implement recursive support for block matrices.");
104  RCP<const Xpetra::EpetraCrsMatrixT<GO,NO>> tmp_ECrsMtx = rcp_dynamic_cast<const Xpetra::EpetraCrsMatrixT<GO,NO> >(blockCrsWrap->getCrsMatrix());
105  if (tmp_ECrsMtx == Teuchos::null)
106  throw Exceptions::BadCast("MueLu::EpetraOperator::Comm(): Cast from Xpetra::CrsMatrix to Xpetra::EpetraCrsMatrix failed");
107  RCP<Epetra_CrsMatrix> epA = tmp_ECrsMtx->getEpetra_CrsMatrixNonConst();
108  return epA->Comm();
109  }
110 
111  RCP<const Xpetra::CrsMatrixWrap<SC,LO,GO,NO> > crsOp = rcp_dynamic_cast<const Xpetra::CrsMatrixWrap<SC,LO,GO,NO> >(A);
112  if (crsOp == Teuchos::null)
113  throw Exceptions::BadCast("Cast from Xpetra::Matrix to Xpetra::CrsMatrixWrap failed");
114  const RCP<const Xpetra::EpetraCrsMatrixT<GO,NO>> &tmp_ECrsMtx = rcp_dynamic_cast<const Xpetra::EpetraCrsMatrixT<GO,NO>>(crsOp->getCrsMatrix());
115  if (tmp_ECrsMtx == Teuchos::null)
116  throw Exceptions::BadCast("Cast from Xpetra::CrsMatrix to Xpetra::EpetraCrsMatrix failed");
117  return tmp_ECrsMtx->getEpetra_CrsMatrixNonConst()->Comm();
118 }
119 
120 const Epetra_Map& EpetraOperator::OperatorDomainMap() const {
121  RCP<Xpetra::Matrix<SC,LO,GO,NO> > A = Hierarchy_->GetLevel(0)->Get<RCP<Matrix> >("A");
122 
123  RCP<Xpetra::BlockedCrsMatrix<SC, LO, GO, NO> > epbA = Teuchos::rcp_dynamic_cast<Xpetra::BlockedCrsMatrix<SC, LO, GO, NO> >(A);
124  if (epbA != Teuchos::null)
125  return Xpetra::toEpetra(epbA->getFullDomainMap()); // TODO check me
126 
127  RCP<const Xpetra::CrsMatrixWrap<SC,LO,GO,NO> > crsOp = rcp_dynamic_cast<const Xpetra::CrsMatrixWrap<SC,LO,GO,NO> >(A);
128  if (crsOp == Teuchos::null)
129  throw Exceptions::BadCast("Cast from Xpetra::Matrix to Xpetra::CrsMatrixWrap failed");
130  const RCP<const Xpetra::EpetraCrsMatrixT<GO,NO>> &tmp_ECrsMtx = rcp_dynamic_cast<const Xpetra::EpetraCrsMatrixT<GO,NO>>(crsOp->getCrsMatrix());
131  if (tmp_ECrsMtx == Teuchos::null)
132  throw Exceptions::BadCast("Cast from Xpetra::CrsMatrix to Xpetra::EpetraCrsMatrix failed");
133  return tmp_ECrsMtx->getEpetra_CrsMatrixNonConst()->DomainMap();
134 }
135 
136 const Epetra_Map & EpetraOperator::OperatorRangeMap() const {
137  RCP<Xpetra::Matrix<SC,LO,GO,NO> > A = Hierarchy_->GetLevel(0)->Get<RCP<Matrix> >("A");
138 
139  RCP<Xpetra::BlockedCrsMatrix<SC, LO, GO, NO> > epbA = Teuchos::rcp_dynamic_cast<Xpetra::BlockedCrsMatrix<SC, LO, GO, NO> >(A);
140  if (epbA != Teuchos::null)
141  return Xpetra::toEpetra(epbA->getFullRangeMap());
142 
143  RCP<const Xpetra::CrsMatrixWrap<SC,LO,GO,NO> > crsOp = rcp_dynamic_cast<const Xpetra::CrsMatrixWrap<SC,LO,GO,NO> >(A);
144  if (crsOp == Teuchos::null)
145  throw Exceptions::BadCast("Cast from Xpetra::Matrix to Xpetra::CrsMatrixWrap failed");
146  const RCP<const Xpetra::EpetraCrsMatrix> &tmp_ECrsMtx = rcp_dynamic_cast<const Xpetra::EpetraCrsMatrix>(crsOp->getCrsMatrix());
147  if (tmp_ECrsMtx == Teuchos::null)
148  throw Exceptions::BadCast("Cast from Xpetra::CrsMatrix to Xpetra::EpetraCrsMatrix failed");
149  return tmp_ECrsMtx->getEpetra_CrsMatrixNonConst()->RangeMap();
150 }
151 
152 } // namespace
153 
154 #endif // #if defined(HAVE_MUELU_SERIAL) and defined(HAVE_MUELU_EPETRA)
TEUCHOS_DEPRECATED RCP< T > rcp(T *p, Dealloc_T dealloc, bool owns_mem)