/usr/include/trilinos/ROL_BlockOperator.hpp is in libtrilinos-rol-dev 12.12.1-5.
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// Rapid Optimization Library (ROL) Package
// Copyright (2014) Sandia Corporation
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// @HEADER
#ifndef ROL_BLOCKOPERATOR_H
#define ROL_BLOCKOPERATOR_H
#include "ROL_LinearOperator.hpp"
#include "ROL_PartitionedVector.hpp"
/** @ingroup func_group
\class ROL::BlockOperator
\brief Provides the interface to apply a block operator to a
partitioned vector.
---
*/
namespace ROL {
template<class Real>
class BlockOperator : public LinearOperator<Real> {
typedef Vector<Real> V; // ROL Vector
typedef PartitionedVector<Real> PV; // Partitioned Vector
typedef LinearOperator<Real> OP; // Linear Operator
typedef std::vector<Teuchos::RCP<OP> > OpVec; // Vector (column-stacked matrix) of pointers to operators
typedef typename OpVec::size_type uint; // index type
private:
Teuchos::RCP<OpVec> blocks_;
public:
BlockOperator() {}
BlockOperator( const Teuchos::RCP<OpVec> &blocks ) : blocks_(blocks) {}
virtual void apply( V &Hv, const V &v, Real &tol ) const {
// Downcast to Partitioned Vectors
PV &Hv_part = Teuchos::dyn_cast<PV>(Hv);
const PV &v_part = Teuchos::dyn_cast<const PV>(v);
uint nvec1 = v_part.numVectors();
uint nvec2 = Hv_part.numVectors();
uint nblks = blocks_->size();
TEUCHOS_TEST_FOR_EXCEPTION( (nvec1 != nvec2), std::invalid_argument,
">>> ERROR (ROL_BlockOperator, apply): "
"Mismatch between input and output number of subvectors.");
TEUCHOS_TEST_FOR_EXCEPTION( (nblks != nvec1*nvec2 ) , std::invalid_argument,
">>> ERROR (ROL_BlockOperator, apply): "
"Block operator dimension mismatch.");
for( uint i=0; i<nvec1; ++i ) {
Teuchos::RCP<V> Hvi = Hv_part.get(i);
Teuchos::RCP<V> u = Hvi->clone();
u->zero();
for( uint j=0; j<nvec2; ++j ) {
uint k = i+nvec1*j;
(*blocks_)[k]->apply(*u,*v_part.get(j),tol);
Hvi->plus(*u);
}
}
}
}; // class BlockOperator
} // namespace ROL
#endif // ROL_BLOCKOPERATOR_H
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