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#ifndef ROL_DIAGONALOPERATOR_H
#define ROL_DIAGONALOPERATOR_H
#include "ROL_Vector.hpp"
#include "ROL_Elementwise_Function.hpp"
#include "ROL_LinearOperator.hpp"
/** @ingroup func_group
\class ROL::DiagonalOperator
\brief Provides the interface to apply a diagonal operator which acts like
elementwise multiplication when apply() is used and elementwise division
when applyInverse() is used.
*/
namespace ROL {
template<class Real>
class DiagonalOperator : public LinearOperator<Real> {
private:
Teuchos::RCP<Vector<Real> > diag_;
const Elementwise::Multiply<Real> mult_;
const Elementwise::Divide<Real> div_;
public:
DiagonalOperator( const Vector<Real> &diag ) : diag_(diag.clone()) {
diag_->set(diag);
}
void update( const Vector<Real> &x, bool flag = true, int iter = -1 ) {
diag_->set(x);
}
void apply( Vector<Real> &Hv, const Vector<Real> &v, Real &tol ) const {
Hv.set(v);
Hv.applyBinary( mult_, *diag_ );
}
void applyInverse( Vector<Real> &Hv, const Vector<Real> &v, Real &tol ) const {
Hv.set(v);
Hv.applyBinary( div_, *diag_ );
}
};
} // namespace ROL
#endif // ROL_DIAGONALOPERATOR_H
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