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MueLu_DropNegativeEntriesFactory_def.hpp
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47 #ifndef MUELU_DROPNEGATIVEENTRIESFACTORY_DEF_HPP
48 #define MUELU_DROPNEGATIVEENTRIESFACTORY_DEF_HPP
49 
50 #include <Xpetra_CrsGraph.hpp>
51 #include <Xpetra_Matrix.hpp>
52 #include <Xpetra_Vector.hpp>
53 #include <Xpetra_MatrixFactory.hpp>
55 
57 
58 #include "MueLu_FactoryManager.hpp"
59 #include "MueLu_Level.hpp"
60 #include "MueLu_GraphBase.hpp"
61 #include "MueLu_Graph.hpp"
62 #include "MueLu_Monitor.hpp"
63 
64 namespace MueLu {
65 
66  template <class Scalar, class LocalOrdinal, class GlobalOrdinal, class Node>
68  RCP<ParameterList> validParamList = rcp(new ParameterList());
69 
70 #define SET_VALID_ENTRY(name) validParamList->setEntry(name, MasterList::getEntry(name))
71 #undef SET_VALID_ENTRY
72 
73  validParamList->set< RCP<const FactoryBase> >("A", Teuchos::null, "Generating factory of the matrix A used for filtering");
74 
75  return validParamList;
76  }
77 
78  template <class Scalar, class LocalOrdinal, class GlobalOrdinal, class Node>
80  Input(currentLevel, "A");
81  }
82 
83  template <class Scalar, class LocalOrdinal, class GlobalOrdinal, class Node>
85  FactoryMonitor m(*this, "Matrix filtering (springs)", currentLevel);
86 
87  RCP<Matrix> Ain = Get< RCP<Matrix> >(currentLevel, "A");
88 
89  LocalOrdinal nDofsPerNode = Ain->GetFixedBlockSize();
90 
91  // create new empty Operator
92  Teuchos::RCP<Matrix> Aout = MatrixFactory::Build(Ain->getRowMap(), Ain->getGlobalMaxNumRowEntries(), Xpetra::StaticProfile);
93 
94  size_t numLocalRows = Ain->getNodeNumRows();
95  for(size_t row=0; row<numLocalRows; row++) {
96  GlobalOrdinal grid = Ain->getRowMap()->getGlobalElement(row);
97 
98  int rDofID = Teuchos::as<int>(grid % nDofsPerNode);
99 
100  // extract row information from input matrix
103  Ain->getLocalRowView(row, indices, vals);
104 
105  // just copy all values in output
108 
109  size_t nNonzeros = 0;
110  for(size_t i=0; i<(size_t)indices.size(); i++) {
111  GlobalOrdinal gcid = Ain->getColMap()->getGlobalElement(indices[i]); // global column id
112 
113  int cDofID = Teuchos::as<int>(gcid % nDofsPerNode);
115  indout [nNonzeros] = gcid;
116  valout [nNonzeros] = vals[i];
117  nNonzeros++;
118  }
119  }
120  indout.resize(nNonzeros);
121  valout.resize(nNonzeros);
122 
123  Aout->insertGlobalValues(Ain->getRowMap()->getGlobalElement(row), indout.view(0,indout.size()), valout.view(0,valout.size()));
124  }
125 
126  Aout->fillComplete(Ain->getDomainMap(), Ain->getRangeMap());
127 
128  // copy block size information
129  Aout->SetFixedBlockSize(nDofsPerNode);
130 
131  GetOStream(Statistics0, 0) << "Nonzeros in A (input): " << Ain->getGlobalNumEntries() << ", Nonzeros after filtering A: " << Aout->getGlobalNumEntries() << std::endl;
132 
133  Set(currentLevel, "A", Aout);
134  }
135 
136 } //namespace MueLu
137 
138 #endif // MUELU_DROPNEGATIVEENTRIESFACTORY_DEF_HPP
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.
void resize(const size_type n, const T &val=T())
RCP< const ParameterList > GetValidParameterList() const
Return a const parameter list of valid parameters that setParameterList() will accept.
Print statistics that do not involve significant additional computation.
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
void Build(Level &currentLevel) const
Build method.
static magnitudeType magnitude(T a)
void DeclareInput(Level &currentLevel) const
Input.