MueLu_AlgebraicPermutationStrategy_decl.hpp

Go to the documentation of this file.

/*
 * MueLu_AlgebraicPermutationStrategy_decl.hpp
 *
 *  Created on: Feb 20, 2013
 *      Author: tobias
 */
 
#ifndef MUELU_ALGEBRAICPERMUTATIONSTRATEGY_DECL_HPP_
#define MUELU_ALGEBRAICPERMUTATIONSTRATEGY_DECL_HPP_
 
#include <Xpetra_MultiVector_fwd.hpp>
#include <Xpetra_Matrix_fwd.hpp>
#include <Xpetra_CrsGraph_fwd.hpp>
#include <Xpetra_Vector_fwd.hpp>
#include <Xpetra_MultiVectorFactory_fwd.hpp>
#include <Xpetra_VectorFactory_fwd.hpp>
#include <Xpetra_CrsMatrixWrap_fwd.hpp>
#include <Xpetra_Export_fwd.hpp>
#include <Xpetra_ExportFactory_fwd.hpp>
#include <Xpetra_Import_fwd.hpp>
#include <Xpetra_ImportFactory_fwd.hpp>
 
#include "MueLu_ConfigDefs.hpp"
#include "MueLu_Level.hpp"
#include "MueLu_BaseClass.hpp"
 
namespace MueLu {
 
// template struct for comparing pairs
template<class Scalar = double, class LocalOrdinal = int>
struct CompPairs {
  CompPairs(const std::vector<Scalar> & v) : vinternal_(v) {}
  std::vector<Scalar> vinternal_;
  bool operator()(LocalOrdinal a, LocalOrdinal b) {
    //return vinternal_[a] < vinternal_[b];
    return Teuchos::ScalarTraits<Scalar>::magnitude(vinternal_[a]) > Teuchos::ScalarTraits<Scalar>::magnitude(vinternal_[b]);
  }
};
 
// template function for comparison
template<class Scalar, class LocalOrdinal>
CompPairs<Scalar,LocalOrdinal> CreateCmpPairs(const std::vector<Scalar> & v) {
  return CompPairs<Scalar,LocalOrdinal>(v);
}
 
// template function for sorting permutations
template<class Scalar, class LocalOrdinal>
void sortingPermutation(const std::vector<Scalar> & values, std::vector<LocalOrdinal> & v) {
  size_t size = values.size();
  v.clear(); v.reserve(size);
  for(size_t i=0; i<size; ++i)
    v.push_back(i);
 
  std::sort(v.begin(),v.end(), MueLu::CreateCmpPairs<Scalar,LocalOrdinal>(values));
}
 
 
  template<class Scalar = double,
           class LocalOrdinal = int,
           class GlobalOrdinal = LocalOrdinal,
           class Node = KokkosClassic::DefaultNode::DefaultNodeType>
  class AlgebraicPermutationStrategy : public BaseClass {
#undef MUELU_ALGEBRAICPERMUTATIONSTRATEGY_SHORT
#include "MueLu_UseShortNames.hpp"
  public:
 
 
 
 
    void BuildPermutation(const Teuchos::RCP<Matrix> & A, const Teuchos::RCP<const Map> permRowMap, Level & currentLevel, const FactoryBase* genFactory) const;
 
 
 
  private:
   };
 
} // namespace MueLu
 
#define MUELU_ALGEBRAICPERMUTATIONSTRATEGY_SHORT
 
 
#endif /* MUELU_ALGEBRAICPERMUTATIONSTRATEGY_DECL_HPP_ */