derivative.cpp

/*
 * This file is part of the ResOpt project.
 *
 * Copyright (C) 2011-2013 Aleksander O. Juell <aleksander.juell@ntnu.no>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 */


#include "derivative.h"

namespace ResOpt
{

Derivative::Derivative() :
    m_constraint_id(-1)
{
}


Derivative::Derivative(int con_id) :
    m_constraint_id(con_id)
{
}

//-----------------------------------------------------------------------------------------------
// returns the value of the partial derivative for variable with id = var_id
//-----------------------------------------------------------------------------------------------
double Derivative::valueById(int var_id)
{
    for(int i = 0; i < m_partial_derivatives.size(); ++i)
    {
        if(m_partial_derivatives.at(i).first == var_id) return m_partial_derivatives.at(i).second;
    }

    return 0;

}

} // namespace