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// Rapid Optimization Library (ROL) Package
// Copyright (2014) Sandia Corporation
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#ifndef ROL_BLOCKOPERATOR2DIAGONAL_H
#define ROL_BLOCKOPERATOR2DIAGONAL_H
#include "ROL_BlockOperator2.hpp"
/** @ingroup func_group
\class ROL::BlockOperator2Diagonal
\brief Provides the interface to apply a 2x2 block diagonal operator to a
partitioned vector.
\f[ M = \begin{pmatrix} A & 0 \\ 0 & D \end{pmatrix} \f]
\f[ M^{-1} = \begin{pmatrix} A^{-1} & 0 \\ 0 & D^^{-1} \end{pmatrix} \f]
---
*/
namespace ROL {
template<class Real>
class BlockOperator2Diagonal : public BlockOperator2<Real> {
typedef Vector<Real> V; // ROL Vector
typedef PartitionedVector<Real> PV; // ROL PartitionedVector
typedef LinearOperator<Real> OP; // Linear Operator
private:
Teuchos::RCP<OP> A_, D_;
public:
BlockOperator2Diagonal( Teuchos::RCP<OP> &A, Teuchos::RCP<OP> &D ) : A_(A), D_(D) {}
}
void apply( V &Hv, const V &v, Real &tol ) const {
using Teuchos::RCP;
PV &Hv_pv = Teuchos::dyn_cast<PV>(Hv);
const PV &v_pv = Teuchos::dyn_cast<const PV>(v);
RCP<V> Hv1 = Hv_pv.get(0);
RCP<V> Hv2 = Hv_pv.get(1);
RCP<const V> v1 = v_pv.get(0);
RCP<const V> v2 = v_pv.get(1);
A_->apply(*Hv1,*v1,tol);
D_->apply(*Hv2,*v2,tol);
}
void applyInverse( V &Hv, const V &v Real &tol ) const {
using Teuchos::RCP;
PV &Hv_pv = Teuchos::dyn_cast<PV>(Hv);
const PV &v_pv = Teuchos::dyn_cast<const PV>(v);
RCP<V> Hv1 = Hv_pv.get(0);
RCP<V> Hv2 = Hv_pv.get(1);
RCP<const V> v1 = v_pv.get(0);
RCP<const V> v2 = v_pv.get(1);
A_->applyInverse(*Hv1,*v1,tol);
D_->applyInverse(*Hv2,*v2,tol);
}
Teuchos::RCP<LinearOperator<Real> > getOperator( int row, int col ) const {
if( row == 0 && col == 0 ) {
return A_;
}
else if( row == 1 && col == 1 ) {
return D_;
}
else {
TEUCHOS_TEST_FOR_EXCEPTION( true, std::invalid_argument,
">>> ERROR (ROL_BlockOperator2Diagonal, getOperator): "
"invalid block indices.");
}
}
}; // class BlockOperator2Diagonal
} // namespace ROL
#endif // ROL_BLOCKOPERATOR2DIAGONAL_H
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