C++ MultiVector::doExport方法代码示例

void
OverlappingRowMatrix<MatrixType>::
exportMultiVector (const Tpetra::MultiVector<scalar_type,local_ordinal_type,global_ordinal_type,node_type> &OvX,
                   Tpetra::MultiVector<scalar_type,local_ordinal_type,global_ordinal_type,node_type> &X,
                   Tpetra::CombineMode CM)
{
  X.doExport (OvX, *Importer_, CM);
}

void IdentitySolver<MatrixType>::
apply (const Tpetra::MultiVector<scalar_type,local_ordinal_type,global_ordinal_type,node_type>& X,
       Tpetra::MultiVector<scalar_type,local_ordinal_type,global_ordinal_type,node_type>& Y,
       Teuchos::ETransp /*mode*/,
       scalar_type alpha,
       scalar_type beta) const
{
  using Teuchos::RCP;
  typedef Teuchos::ScalarTraits<scalar_type> STS;
  typedef Tpetra::MultiVector<scalar_type, local_ordinal_type,
                              global_ordinal_type, node_type> MV;

  TEUCHOS_TEST_FOR_EXCEPTION(
    ! isComputed (), std::runtime_error,
    "Ifpack2::IdentitySolver::apply: If compute() has not yet been called, "
    "or if you have changed the matrix via setMatrix(), "
    "you must call compute() before you may call this method.");

  // "Identity solver" does what it says: it's the identity operator.
  // We have to Export if the domain and range Maps are not the same.
  // Otherwise, this operator would be a permutation, not the identity.
  if (export_.is_null ()) {
    Y.update (alpha, X, beta);
  }
  else {
    if (alpha == STS::one () && beta == STS::zero ()) { // the common case
      Y.doExport (X, *export_, Tpetra::REPLACE);
    }
    else {
      // We know that the domain and range Maps are compatible.  First
      // bring X into the range Map via Export.  Then compute in place
      // in Y.
      MV X_tmp (Y.getMap (), Y.getNumVectors ());
      X_tmp.doExport (X, *export_, Tpetra::REPLACE);
      Y.update (alpha, X_tmp, beta);
    }
  }
  ++numApply_;
}

void LocalSparseTriangularSolver<MatrixType>::
apply (const Tpetra::MultiVector<scalar_type, local_ordinal_type,
         global_ordinal_type, node_type>& X,
       Tpetra::MultiVector<scalar_type, local_ordinal_type,
         global_ordinal_type, node_type>& Y,
       Teuchos::ETransp mode,
       scalar_type alpha,
       scalar_type beta) const
{
  using Teuchos::RCP;
  using Teuchos::rcp;
  using Teuchos::rcpFromRef;
  typedef scalar_type ST;
  typedef Teuchos::ScalarTraits<ST> STS;
  const char prefix[] = "Ifpack2::LocalSparseTriangularSolver::apply: ";
  if (! out_.is_null ()) {
    *out_ << ">>> DEBUG " << prefix;
    if (A_crs_.is_null ()) {
      *out_ << "A_crs_ is null!" << std::endl;
    }
    else {
      const std::string uplo = A_crs_->isUpperTriangular () ? "U" :
        (A_crs_->isLowerTriangular () ? "L" : "N");
      const std::string trans = (mode == Teuchos::CONJ_TRANS) ? "C" :
        (mode == Teuchos::TRANS ? "T" : "N");
      const std::string diag =
        (A_crs_->getNodeNumDiags () < A_crs_->getNodeNumRows ()) ? "U" : "N";
      *out_ << "uplo=\"" << uplo
            << "\", trans=\"" << trans
            << "\", diag=\"" << diag << "\"" << std::endl;
    }
  }

  TEUCHOS_TEST_FOR_EXCEPTION
    (! isComputed (), std::runtime_error, prefix << "If compute() has not yet "
     "been called, or if you have changed the matrix via setMatrix(), you must "
     "call compute() before you may call this method.");
  // If isComputed() is true, it's impossible for the matrix to be
  // null, or for it not to be a Tpetra::CrsMatrix.
  TEUCHOS_TEST_FOR_EXCEPTION
    (A_.is_null (), std::logic_error, prefix << "A_ is null.  "
     "Please report this bug to the Ifpack2 developers.");
  TEUCHOS_TEST_FOR_EXCEPTION
    (A_crs_.is_null (), std::logic_error, prefix << "A_crs_ is null.  "
     "Please report this bug to the Ifpack2 developers.");
  // However, it _is_ possible that the user called resumeFill() on
  // the matrix, after calling compute().  This is NOT allowed.
  TEUCHOS_TEST_FOR_EXCEPTION
    (! A_crs_->isFillComplete (), std::runtime_error, "If you call this "
     "method, the matrix must be fill complete.  It is not.  This means that "
     " you must have called resumeFill() on the matrix before calling apply(). "
     "This is NOT allowed.  Note that this class may use the matrix's data in "
     "place without copying it.  Thus, you cannot change the matrix and expect "
     "the solver to stay the same.  If you have changed the matrix, first call "
     "fillComplete() on it, then call compute() on this object, before you call"
     " apply().  You do NOT need to call setMatrix, as long as the matrix "
     "itself (that is, its address in memory) is the same.");

  auto G = A_->getGraph ();
  TEUCHOS_TEST_FOR_EXCEPTION
    (G.is_null (), std::logic_error, prefix << "A_ and A_crs_ are nonnull, "
     "but A_'s RowGraph G is null.  "
     "Please report this bug to the Ifpack2 developers.");
  auto importer = G->getImporter ();
  auto exporter = G->getExporter ();

  if (! importer.is_null ()) {
    if (X_colMap_.is_null () || X_colMap_->getNumVectors () != X.getNumVectors ()) {
      X_colMap_ = rcp (new MV (importer->getTargetMap (), X.getNumVectors ()));
    }
    else {
      X_colMap_->putScalar (STS::zero ());
    }
    // See discussion of Github Issue #672 for why the Import needs to
    // use the ZERO CombineMode.  The case where the Export is
    // nontrivial is likely never exercised.
    X_colMap_->doImport (X, *importer, Tpetra::ZERO);
  }
  RCP<const MV> X_cur = importer.is_null () ? rcpFromRef (X) :
    Teuchos::rcp_const_cast<const MV> (X_colMap_);

  if (! exporter.is_null ()) {
    if (Y_rowMap_.is_null () || Y_rowMap_->getNumVectors () != Y.getNumVectors ()) {
      Y_rowMap_ = rcp (new MV (exporter->getSourceMap (), Y.getNumVectors ()));
    }
    else {
      Y_rowMap_->putScalar (STS::zero ());
    }
    Y_rowMap_->doExport (Y, *importer, Tpetra::ADD);
  }
  RCP<MV> Y_cur = exporter.is_null () ? rcpFromRef (Y) : Y_rowMap_;

  localApply (*X_cur, *Y_cur, mode, alpha, beta);

  if (! exporter.is_null ()) {
    Y.putScalar (STS::zero ());
    Y.doExport (*Y_cur, *exporter, Tpetra::ADD);
  }

  ++numApply_;
//.........这里部分代码省略.........