C++ MultiVector::getLocalLength方法代码示例

void ReorderFilter<MatrixType>::permuteOriginalToReorderedTempl(const Tpetra::MultiVector<DomainScalar,local_ordinal_type,global_ordinal_type,node_type> &originalX,
                                                                Tpetra::MultiVector<RangeScalar,local_ordinal_type,global_ordinal_type,node_type> &reorderedY) const
{
  TEUCHOS_TEST_FOR_EXCEPTION(originalX.getNumVectors() != reorderedY.getNumVectors(), std::runtime_error,
                             "Ifpack2::ReorderFilter::permuteOriginalToReordered ERROR: X.getNumVectors() != Y.getNumVectors().");

  Teuchos::ArrayRCP<Teuchos::ArrayRCP<const DomainScalar> > x_ptr = originalX.get2dView();
  Teuchos::ArrayRCP<Teuchos::ArrayRCP<RangeScalar> >        y_ptr = reorderedY.get2dViewNonConst();

  for(size_t k=0; k < originalX.getNumVectors(); k++)
    for(local_ordinal_type i=0; (size_t)i< originalX.getLocalLength(); i++)
      y_ptr[k][perm_[i]] = (RangeScalar)x_ptr[k][i];
}

void SparseContainer<MatrixType,InverseType>::
applyImpl (const Tpetra::MultiVector<InverseScalar,InverseLocalOrdinal,InverseGlobalOrdinal,InverseNode>& X,
           Tpetra::MultiVector<InverseScalar,InverseLocalOrdinal,InverseGlobalOrdinal,InverseNode>& Y,
           Teuchos::ETransp mode,
           InverseScalar alpha,
           InverseScalar beta) const
{
  TEUCHOS_TEST_FOR_EXCEPTION(
    Inverse_->getDomainMap ()->getNodeNumElements () != X.getLocalLength (),
    std::logic_error, "Ifpack2::SparseContainer::apply: Inverse_ "
    "operator and X have incompatible dimensions (" <<
    Inverse_->getDomainMap ()->getNodeNumElements () << " resp. "
    << X.getLocalLength () << ").  Please report this bug to "
    "the Ifpack2 developers.");
  TEUCHOS_TEST_FOR_EXCEPTION(
    Inverse_->getRangeMap ()->getNodeNumElements () != Y.getLocalLength (),
    std::logic_error, "Ifpack2::SparseContainer::apply: Inverse_ "
    "operator and Y have incompatible dimensions (" <<
    Inverse_->getRangeMap ()->getNodeNumElements () << " resp. "
    << Y.getLocalLength () << ").  Please report this bug to "
    "the Ifpack2 developers.");

  Inverse_->apply (X, Y, mode, alpha, beta);
}

size_t findUniqueGids(
  Tpetra::MultiVector<gno_t, lno_t, gno_t> &keys,
  Tpetra::Vector<gno_t, lno_t, gno_t> &gids
)
{
  // Input:  Tpetra MultiVector of keys; key length = numVectors()
  //         May contain duplicate keys within a processor.
  //         May contain duplicate keys across processors.
  // Input:  Empty Tpetra Vector with same map for holding the results
  // Output: Filled gids vector, containing unique global numbers for
  //         each unique key.  Global numbers are in range [0,#UniqueKeys).

  size_t num_keys = keys.getLocalLength();
  size_t num_entries = keys.getNumVectors();

#ifdef HAVE_ZOLTAN2_MPI
  MPI_Comm mpicomm = Teuchos::getRawMpiComm(*(keys.getMap()->getComm()));
#else
  // Zoltan's siMPI will be used here
  {
    int flag;
    MPI_Initialized(&flag);
    if (!flag) {
      int narg = 0;
      char **argv = NULL;
      MPI_Init(&narg, &argv);
    }
  }
  MPI_Comm mpicomm = MPI_COMM_WORLD;  // Will get MPI_COMM_WORLD from siMPI
#endif

  int num_gid = sizeof(gno_t)/sizeof(ZOLTAN_ID_TYPE) * num_entries;
  int num_user = sizeof(gno_t);

  // Buffer the keys for Zoltan_DD
  Teuchos::ArrayRCP<const gno_t> *tmpKeyVecs =
           new Teuchos::ArrayRCP<const gno_t>[num_entries];
  for (size_t v = 0; v < num_entries; v++) tmpKeyVecs[v] = keys.getData(v);

  ZOLTAN_ID_PTR ddkeys = new ZOLTAN_ID_TYPE[num_gid * num_keys];
  size_t idx = 0;
  for (size_t i = 0; i < num_keys; i++) {
    for (size_t v = 0; v < num_entries; v++) {
      ZOLTAN_ID_PTR ddkey = &(ddkeys[idx]);
      TPL_Traits<ZOLTAN_ID_PTR,gno_t>::ASSIGN(ddkey, tmpKeyVecs[v][i]);
      idx += TPL_Traits<ZOLTAN_ID_PTR,gno_t>::NUM_ID;
    }
  }
  delete [] tmpKeyVecs;

  // Allocate memory for the result
  char *ddnewgids = new char[num_user * num_keys];
  
  // Compute the new GIDs
  size_t nUnique = findUniqueGidsCommon<gno_t>(num_keys, num_gid,
                                               ddkeys, ddnewgids, mpicomm);

  // Copy the result into the output vector
  gno_t *result = (gno_t *)ddnewgids;
  for (size_t i = 0; i < num_keys; i++)
    gids.replaceLocalValue(i, result[i]);

  // Clean up
  delete [] ddkeys;
  delete [] ddnewgids;

  return nUnique;
}