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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_Import.hpp>
54 #include <Xpetra_MatrixFactory.hpp>
55 #include <Xpetra_VectorFactory.hpp>
56 #include <Xpetra_ImportFactory.hpp>
58 
60 
61 #include "MueLu_FactoryManager.hpp"
62 #include "MueLu_Level.hpp"
63 #include "MueLu_GraphBase.hpp"
64 #include "MueLu_Graph.hpp"
65 #include "MueLu_Monitor.hpp"
66 
67 namespace MueLu {
68 
69  template <class Scalar, class LocalOrdinal, class GlobalOrdinal, class Node>
71  RCP<ParameterList> validParamList = rcp(new ParameterList());
72 
73 #define SET_VALID_ENTRY(name) validParamList->setEntry(name, MasterList::getEntry(name))
74 #undef SET_VALID_ENTRY
75 
76  validParamList->set< RCP<const FactoryBase> >("A", Teuchos::null, "Generating factory of the matrix A used for filtering");
77 
78  return validParamList;
79  }
80 
81  template <class Scalar, class LocalOrdinal, class GlobalOrdinal, class Node>
83  Input(currentLevel, "A");
84  }
85 
86  template <class Scalar, class LocalOrdinal, class GlobalOrdinal, class Node>
88  FactoryMonitor m(*this, "Matrix filtering (springs)", currentLevel);
89 
90  RCP<Matrix> Ain = Get< RCP<Matrix> >(currentLevel, "A");
91 
92  LocalOrdinal nDofsPerNode = Ain->GetFixedBlockSize();
93 
94  // create new empty Operator
95  Teuchos::RCP<Matrix> Aout = MatrixFactory::Build(Ain->getRowMap(), Ain->getGlobalMaxNumRowEntries(), Xpetra::StaticProfile);
96 
97  size_t numLocalRows = Ain->getNodeNumRows();
98  for(size_t row=0; row<numLocalRows; row++) {
99  GlobalOrdinal grid = Ain->getRowMap()->getGlobalElement(row);
100 
101  int rDofID = Teuchos::as<int>(grid % nDofsPerNode);
102 
103  // extract row information from input matrix
106  Ain->getLocalRowView(row, indices, vals);
107 
108  // just copy all values in output
111 
112  size_t nNonzeros = 0;
113  for(size_t i=0; i<(size_t)indices.size(); i++) {
114  GlobalOrdinal gcid = Ain->getColMap()->getGlobalElement(indices[i]); // global column id
115 
116  int cDofID = Teuchos::as<int>(gcid % nDofsPerNode);
118  indout [nNonzeros] = gcid;
119  valout [nNonzeros] = vals[i];
120  nNonzeros++;
121  }
122  }
123  indout.resize(nNonzeros);
124  valout.resize(nNonzeros);
125 
126  Aout->insertGlobalValues(Ain->getRowMap()->getGlobalElement(row), indout.view(0,indout.size()), valout.view(0,valout.size()));
127  }
128 
129  Aout->fillComplete(Ain->getDomainMap(), Ain->getRangeMap());
130 
131  // copy block size information
132  Aout->SetFixedBlockSize(nDofsPerNode);
133 
134  GetOStream(Statistics0, 0) << "Nonzeros in A (input): " << Ain->getGlobalNumEntries() << ", Nonzeros after filtering A: " << Aout->getGlobalNumEntries() << std::endl;
135 
136  Set(currentLevel, "A", Aout);
137  }
138 
139 } //namespace MueLu
140 
141 #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.
Namespace for MueLu classes and methods.
void resize(const size_type n, const T &val=T())
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 DeclareInput(Level &currentLevel) const
Input.
void Build(Level &currentLevel) const
Build method.
RCP< const ParameterList > GetValidParameterList() const
Return a const parameter list of valid parameters that setParameterList() will accept.
static magnitudeType magnitude(T a)