LU.hpp

// Reaktoro is a unified framework for modeling chemically reactive systems.
//
// Copyright © 2014-2024 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/Common/Index.hpp>
#include <Reaktoro/Common/Matrix.hpp>
 
namespace Reaktoro {
 
struct LU
{
    LU();
 
    explicit LU(MatrixXdConstRef A);
 
    LU(MatrixXdConstRef A, VectorXdConstRef W);
 
    auto empty() const -> bool;
 
    auto compute(MatrixXdConstRef A) -> void;
 
    auto compute(MatrixXdConstRef A, VectorXdConstRef W) -> void;
 
    auto solve(MatrixXdConstRef b) -> MatrixXd;
 
    auto trsolve(MatrixXdConstRef B) -> MatrixXd;
 
    MatrixXd A_last;
 
    VectorXd W_last;
 
    MatrixXd L;
 
    MatrixXd U;
 
    PermutationMatrix P;
 
    PermutationMatrix Q;
 
    Index rank;
};
 
} // namespace Reaktoro