Newton.h

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/*******************************************************************************
 * Copyright (C) 2017-2025 Theodore Chang
 *
 * 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, see <http://www.gnu.org/licenses/>.
 ******************************************************************************/
#ifndef NEWTON_H
#define NEWTON_H
 
#include <Solver/Solver.h>
 
class Newton : public Solver {
    const bool initial_stiffness;
 
    [[nodiscard]] virtual double amplification(const vec&, const vec&) const { return 0.; }
 
protected:
    double inner_product = 0.;
 
public:
    explicit Newton(unsigned = 0, bool = false);
 
    int analyze() override;
 
    void print() override;
};
 
class AICN : public Newton {
    const double l_est;
 
    [[nodiscard]] double amplification(const vec&, const vec&) const override;
 
public:
    explicit AICN(unsigned = 0, double = 1.);
 
    void print() override;
};
 
#endif