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MueLu_NullspaceFactory_def.hpp
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46 #ifndef MUELU_NULLSPACEFACTORY_DEF_HPP
47 #define MUELU_NULLSPACEFACTORY_DEF_HPP
48 
49 #include <Xpetra_Matrix.hpp>
52 #include <Xpetra_VectorFactory.hpp>
53 
55 #include "MueLu_Level.hpp"
56 #include "MueLu_Monitor.hpp"
57 
58 namespace MueLu {
59 
60  template <class Scalar, class LocalOrdinal, class GlobalOrdinal, class Node>
62  RCP<ParameterList> validParamList = rcp(new ParameterList());
63 
64  validParamList->set< std::string >("Fine level nullspace", "Nullspace", "Variable name which is used to store null space multi vector on the finest level (default=\"Nullspace\"). For block matrices also \"Nullspace1\" to \"Nullspace9\" are accepted to describe the null space vectors for the (i,i) block (i=1..9).");
65 
66  validParamList->set< RCP<const FactoryBase> >("A", Teuchos::null, "Generating factory of the fine level matrix (only needed if default null space is generated)");
67  validParamList->set< RCP<const FactoryBase> >("Nullspace", Teuchos::null, "Generating factory of the fine level null space");
68 
69  // TODO not very elegant.
70  // 1/20/2016: we could add a sublist (e.g. "Nullspaces" which is excluded from parameter validation)
71  validParamList->set< RCP<const FactoryBase> >("Nullspace1", Teuchos::null, "Generating factory of the fine level null space associated with the (1,1) block in your n x n block matrix.");
72  validParamList->set< RCP<const FactoryBase> >("Nullspace2", Teuchos::null, "Generating factory of the fine level null space associated with the (2,2) block in your n x n block matrix.");
73  validParamList->set< RCP<const FactoryBase> >("Nullspace3", Teuchos::null, "Generating factory of the fine level null space associated with the (3,3) block in your n x n block matrix.");
74  validParamList->set< RCP<const FactoryBase> >("Nullspace4", Teuchos::null, "Generating factory of the fine level null space associated with the (4,4) block in your n x n block matrix.");
75  validParamList->set< RCP<const FactoryBase> >("Nullspace5", Teuchos::null, "Generating factory of the fine level null space associated with the (5,5) block in your n x n block matrix.");
76  validParamList->set< RCP<const FactoryBase> >("Nullspace6", Teuchos::null, "Generating factory of the fine level null space associated with the (6,6) block in your n x n block matrix.");
77  validParamList->set< RCP<const FactoryBase> >("Nullspace7", Teuchos::null, "Generating factory of the fine level null space associated with the (7,7) block in your n x n block matrix.");
78  validParamList->set< RCP<const FactoryBase> >("Nullspace8", Teuchos::null, "Generating factory of the fine level null space associated with the (8,8) block in your n x n block matrix.");
79  validParamList->set< RCP<const FactoryBase> >("Nullspace9", Teuchos::null, "Generating factory of the fine level null space associated with the (9,9) block in your n x n block matrix.");
80 
81  return validParamList;
82  }
83 
84  template <class Scalar, class LocalOrdinal, class GlobalOrdinal, class Node>
86 
87  const ParameterList & pL = GetParameterList();
88  std::string nspName = pL.get<std::string>("Fine level nullspace");
89 
90  // only request "A" in DeclareInput if
91  // 1) there is not nspName (e.g. "Nullspace") is available in Level, AND
92  // 2) it is the finest level (i.e. LevelID == 0)
93  if (currentLevel.IsAvailable(nspName, NoFactory::get()) == false && currentLevel.GetLevelID() == 0)
94  Input(currentLevel, "A");
95 
96  if (currentLevel.GetLevelID() != 0) {
97  // validate nullspaceFact_
98  // 1) The factory for "Nullspace" (or nspName) must not be Teuchos::null, since the default factory
99  // for "Nullspace" is a NullspaceFactory
100  // 2) The factory for "Nullspace" (or nspName) must be a TentativePFactory or any other TwoLevelFactoryBase derived object
101  // which generates the variable "Nullspace" as output
102  TEUCHOS_TEST_FOR_EXCEPTION(GetFactory(nspName)==Teuchos::null, Exceptions::RuntimeError, "MueLu::NullspaceFactory::DeclareInput(): You must declare an existing factory which produces the variable \"Nullspace\" in the NullspaceFactory (e.g. a TentativePFactory).");
103  currentLevel.DeclareInput("Nullspace", GetFactory(nspName).get(), this); /* ! "Nullspace" and nspName mismatch possible here */
104  }
105  }
106 
107  template <class Scalar, class LocalOrdinal, class GlobalOrdinal, class Node>
109  FactoryMonitor m(*this, "Nullspace factory", currentLevel);
110 
111  RCP<MultiVector> nullspace;
112 
113  //TEUCHOS_TEST_FOR_EXCEPTION(currentLevel.GetLevelID() != 0, Exceptions::RuntimeError, "MueLu::NullspaceFactory::Build(): NullspaceFactory can be used for finest level (LevelID == 0) only.");
114  const ParameterList & pL = GetParameterList();
115  std::string nspName = pL.get<std::string>("Fine level nullspace");
116 
117  if (currentLevel.GetLevelID() == 0) {
118 
119  if (currentLevel.IsAvailable(nspName, NoFactory::get())) {
120  // When a fine nullspace have already been defined by user using Set("Nullspace", ...) or
121  // Set("Nullspace1", ...), we use it.
122  nullspace = currentLevel.Get< RCP<MultiVector> >(nspName, NoFactory::get());
123  GetOStream(Runtime1) << "Use user-given nullspace " << nspName << ": nullspace dimension=" << nullspace->getNumVectors() << " nullspace length=" << nullspace->getGlobalLength() << std::endl;
124  } else {
125  // "Nullspace" (nspName) is not available
126  RCP<Matrix> A = Get< RCP<Matrix> >(currentLevel, "A");
127 
128  // determine numPDEs
129  LocalOrdinal numPDEs = 1;
130  if(A->IsView("stridedMaps")==true) {
131  Xpetra::viewLabel_t oldView = A->SwitchToView("stridedMaps"); // note: "stridedMaps are always non-overlapping (correspond to range and domain maps!)
132  TEUCHOS_TEST_FOR_EXCEPTION(Teuchos::rcp_dynamic_cast<const StridedMap>(A->getRowMap()) == Teuchos::null, Exceptions::BadCast, "MueLu::CoalesceFactory::Build: cast to strided row map failed.");
133  numPDEs = Teuchos::rcp_dynamic_cast<const StridedMap>(A->getRowMap())->getFixedBlockSize();
134  oldView = A->SwitchToView(oldView);
135  }
136 
137  GetOStream(Runtime1) << "Generating canonical nullspace: dimension = " << numPDEs << std::endl;
138  nullspace = MultiVectorFactory::Build(A->getDomainMap(), numPDEs);
139 
140  RCP<BlockedMultiVector> bnsp = Teuchos::rcp_dynamic_cast<BlockedMultiVector>(nullspace);
141  if(bnsp.is_null() == true) {
142  for (int i=0; i<numPDEs; ++i) {
143  ArrayRCP<Scalar> nsValues = nullspace->getDataNonConst(i);
144  int numBlocks = nsValues.size() / numPDEs;
145  for (int j=0; j< numBlocks; ++j) {
146  nsValues[j*numPDEs + i] = 1.0;
147  }
148  }
149  } else {
150  fillNullspaceVector(bnsp,numPDEs);
151  }
152  } // end if "Nullspace" not available
153  } else {
154  // on coarser levels always use "Nullspace" as variable name, since it is expected by
155  // tentative P factory to be "Nullspace"
156 
157  nullspace = currentLevel.Get< RCP<MultiVector> >("Nullspace", GetFactory(nspName).get()); /* ! "Nullspace" and nspName mismatch possible here */
158 
159  }
160 
161  // provide "Nullspace" variable on current level (used by TentativePFactory)
162  Set(currentLevel, "Nullspace", nullspace);
163 
164  } // Build
165 
166  template <class Scalar, class LocalOrdinal, class GlobalOrdinal, class Node>
168  RCP< const BlockedMap> bmap = nsp->getBlockedMap();
169 
170  for(size_t r = 0; r < bmap->getNumMaps(); r++) {
171  Teuchos::RCP<MultiVector> part = nsp->getMultiVector(r);
172  Teuchos::RCP<BlockedMultiVector> bpart = Teuchos::rcp_dynamic_cast<BlockedMultiVector>(part);
173  if(bpart.is_null() == true) {
174  for (int i=0; i<numPDEs; ++i) {
175  ArrayRCP<Scalar> nsValues = part->getDataNonConst(i);
176  int numBlocks = nsValues.size() / numPDEs;
177  for (int j=0; j< numBlocks; ++j) {
178  nsValues[j*numPDEs + i] = 1.0;
179  }
180  }
181  } else {
182  // call this routine recursively
183  fillNullspaceVector(bpart,numPDEs);
184  }
185  }
186  }
187 
188 } //namespace MueLu
189 
190 #endif // MUELU_NULLSPACEFACTORY_DEF_HPP
Exception indicating invalid cast attempted.
T & Get(const std::string &ename, const FactoryBase *factory=NoFactory::get())
Get data without decrementing associated storage counter (i.e., read-only access). Usage: Level-&gt;Get&lt; RCP&lt;Matrix&gt; &gt;(&quot;A&quot;, factory) if factory == NULL =&gt; use default factory.
RCP< const ParameterList > GetValidParameterList() const
Define valid parameters for internal factory parameters.
T & get(const std::string &name, T def_value)
ParameterList & set(std::string const &name, T const &value, std::string const &docString="", RCP< const ParameterEntryValidator > const &validator=null)
Timer to be used in factories. Similar to Monitor but with additional timers.
#define TEUCHOS_TEST_FOR_EXCEPTION(throw_exception_test, Exception, msg)
size_type size() const
static const NoFactory * get()
void DeclareInput(Level &currentLevel) const
Specifies the data that this class needs, and the factories that generate that data.
TEUCHOS_DEPRECATED RCP< T > rcp(T *p, Dealloc_T dealloc, bool owns_mem)
Class that holds all level-specific information.
Definition: MueLu_Level.hpp:99
std::string viewLabel_t
int GetLevelID() const
Return level number.
Definition: MueLu_Level.cpp:76
Exception throws to report errors in the internal logical of the program.
Description of what is happening (more verbose)
void DeclareInput(const std::string &ename, const FactoryBase *factory, const FactoryBase *requestedBy=NoFactory::get())
Callback from FactoryBase::CallDeclareInput() and FactoryBase::DeclareInput()
void fillNullspaceVector(const RCP< BlockedMultiVector > &nsp, LocalOrdinal numPDEs) const
Helper function to recursively fill BlockedMultiVector with default null space vectors.
bool IsAvailable(const std::string &ename, const FactoryBase *factory=NoFactory::get()) const
Test whether a need&#39;s value has been saved.
void Build(Level &currentLevel) const
Build an object with this factory.
bool is_null() const