/usr/include/trilinos/ROL_BlockOperator2Determinant.hpp is in libtrilinos-rol-dev 12.12.1-5.
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#ifndef ROL_BLOCKOPERATOR2DETERMINANT_H
#define ROL_BLOCKOPERATOR2DETERMINANT_H
#include "ROL_BlockOperator2.hpp"
/** @ingroup func_group
\class ROL::BlockOperator2Determinant
\brief Provides the interface to the block determinant of a 2x2 block operator
---
*/
namespace ROL {
template <class Real>
class BlockOperator2Determinant : public LinearOperator<Real> {
typedef Vector<Real> V;
typedef LinearOperator<Real> OP;
private:
Teuchos::RCP<OP> A_, B_, C_, D_;
Teuchos::RCP<V> scratch_;
public:
BlockOperator2Determinant( Teuchos::RCP<OP> &A,
Teuchos::RCP<OP> &B,
Teuchos::RCP<OP> &C,
Teuchos::RCP<OP> &D,
Teuchos::RCP<V> &scratch ) :
A_(A), B_(B), C_(C), D_(D), scratch_(scratch) {}
virtual void update( const Vector<Real> &x, bool flag = true, int iter = -1 ) {
A_->update(x,flag,true);
B_->update(x,flag,true);
C_->update(x,flag,true);
D_->update(x,flag,true);
}
// Apply the determinant \f$(A-BD^{-1}B)\f$
virtual void apply( Vector<Real> &Hv, const Vector<Real> &v, Real &tol ) const {
B_->apply(*scratch_,v,tol);
D_->applyInverse(Hv,*scratch_,tol);
C_->apply(*scratch_,Hv,tol);
A_->apply(Hv,v,tol);
Hv.axpy(-1.0,*scratch_);
}
virtual void applyInverse( Vector<Real> &Hv, const Vector<Real> &v, Real &tol ) const {
TEUCHOS_TEST_FOR_EXCEPTION( true , std::logic_error,
">>> ERROR (ROL_BlockOperator2Determinant, applyInverse): "
"Not implemented.");
}
}; // class BlockOperator2Determinant
} // namespace ROL
#endif // ROL_BLOCKOPERATOR2DETERMINANT_H
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