matrix2D.H

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/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | cfMesh: A library for mesh generation
   \\    /   O peration     |
    \\  /    A nd           | Author: Franjo Juretic (franjo.juretic@c-fields.com)
     \\/     M anipulation  | Copyright (C) Creative Fields, Ltd.
-------------------------------------------------------------------------------
License
    This file is part of cfMesh.
 
    cfMesh 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.
 
    cfMesh 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 cfMesh.  If not, see <http://www.gnu.org/licenses/>.
 
Class
    matrix2D
 
Description
    Implementation of 2 x 2 matrix
 
SourceFiles
 
\*---------------------------------------------------------------------------*/
 
#ifndef matrix2D_H
#define matrix2D_H
 
#include "scalar.H"
#include "FixedList.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
/*---------------------------------------------------------------------------*\
                           Class matrix2D Declaration
\*---------------------------------------------------------------------------*/
 
class matrix2D
: public FixedList<FixedList<scalar, 2>, 2>
{
    // Private members
        scalar det_;
        bool calculatedDet_;
 
    // Private member functions
        //- calculate matrix determinant
        inline void calculateDeterminant();
 
public:
 
    // Constructors
        //- Null constructor
        explicit inline matrix2D();
 
        //- Copy constructor
        inline matrix2D(const matrix2D&);
 
    // Destructor
        inline ~matrix2D();
 
    // Member functions
        //- return matrix determinant
        inline scalar determinant();
 
        //- return inverse matrix
        inline matrix2D inverse();
 
        //- find the solution of the system with the given rhs
        inline FixedList<scalar, 2> solve
        (
            const FixedList<scalar, 2>& source
        );
 
        //- return the first component of the solution vector
        inline scalar solveFirst(const FixedList<scalar, 2>& source);
 
        //- return the second component of the solution vector
        inline scalar solveSecond(const FixedList<scalar, 2>& source);
};
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#include "matrix2DI.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //