Hessian.hpp

// Reaktoro is a unified framework for modeling chemically reactive systems.
//
// Copyright (C) 2014-2018 Allan Leal
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with this library. If not, see <http://www.gnu.org/licenses/>.
 
#pragma once
 
// Reaktoro includes
#include <Reaktoro/Math/Matrix.hpp>
 
namespace Reaktoro {
 
struct Hessian
{
    enum Mode { Dense, Diagonal, Inverse };
 
    Mode mode = Dense;
 
    Matrix inverse;
 
    Matrix dense;
 
    Vector diagonal;
};
 
auto operator*(const Hessian& H, VectorConstRef x) -> Vector;
 
} // namespace Reaktoro