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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>
54#include <Xpetra_CrsGraphFactory.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
64namespace 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());
93
94 size_t numLocalRows = Ain->getLocalNumRows();
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
101 Teuchos::ArrayView<const LocalOrdinal> indices;
102 Teuchos::ArrayView<const Scalar> vals;
103 Ain->getLocalRowView(row, indices, vals);
104
105 // just copy all values in output
106 Teuchos::ArrayRCP<GlobalOrdinal> indout(indices.size(),Teuchos::ScalarTraits<GlobalOrdinal>::zero());
107 Teuchos::ArrayRCP<Scalar> valout(indices.size(),Teuchos::ScalarTraits<Scalar>::zero());
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);
114 if(rDofID == cDofID && Teuchos::ScalarTraits<Scalar>::magnitude(vals[i]) >= Teuchos::ScalarTraits<Scalar>::magnitude(Teuchos::ScalarTraits<Scalar>::zero())) {
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
MueLu::DefaultLocalOrdinal LocalOrdinal
MueLu::DefaultGlobalOrdinal GlobalOrdinal
void DeclareInput(Level &currentLevel) const
Input.
RCP< const ParameterList > GetValidParameterList() const
Return a const parameter list of valid parameters that setParameterList() will accept.
void Build(Level &currentLevel) const
Build method.
Timer to be used in factories. Similar to Monitor but with additional timers.
Class that holds all level-specific information.
Definition: MueLu_Level.hpp:99
Namespace for MueLu classes and methods.
@ Statistics0
Print statistics that do not involve significant additional computation.