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// Rapid Optimization Library (ROL) Package
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#ifndef ROL_LINEAR_OBJECTIVE_H
#define ROL_LINEAR_OBJECTIVE_H
#include "ROL_Objective.hpp"
#include "ROL_Vector.hpp"
#include "Teuchos_RCP.hpp"
/** @ingroup func_group
\class ROL::LinearObjective
\brief Provides the interface to evaluate linear objective functions.
This class implements the linear objective function
\f[
f(x) = \langle c, x\rangle_{\mathcal{X}^*,\mathcal{X}}
\f]
for fixed \f$c\in\mathcal{X}^*\f$.
---
*/
namespace ROL {
template <class Real>
class LinearObjective : public Objective<Real> {
private:
const Teuchos::RCP<const Vector<Real> > cost_;
public:
LinearObjective(const Teuchos::RCP<const Vector<Real> > &cost) : cost_(cost) {}
Real value( const Vector<Real> &x, Real &tol ) {
return x.dot(cost_->dual());
}
void gradient( Vector<Real> &g, const Vector<Real> &x, Real &tol ) {
g.set(*cost_);
}
void hessVec( Vector<Real> &hv, const Vector<Real> &v, const Vector<Real> &x, Real &tol ) {
hv.zero();
}
}; // class LinearObjective
} // namespace ROL
#endif
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