mat3d.hpp

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/* Copyright (c) 2010-2011 Taneli Kalvas. All rights reserved.
 *
 * You can redistribute this software and/or modify it under the terms
 * of the GNU General Public License as published by the Free Software
 * Foundation; either version 2 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
 * General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this library (file "COPYING" included in the package);
 * if not, write to the Free Software Foundation, Inc., 51 Franklin
 * Street, Fifth Floor, Boston, MA 02110-1301 USA
 * 
 * If you have questions about your rights to use or distribute this
 * software, please contact Berkeley Lab's Technology Transfer
 * Department at TTD@lbl.gov. Other questions, comments and bug
 * reports should be sent directly to the author via email at
 * taneli.kalvas@jyu.fi.
 * 
 * NOTICE. This software was developed under partial funding from the
 * U.S.  Department of Energy.  As such, the U.S. Government has been
 * granted for itself and others acting on its behalf a paid-up,
 * nonexclusive, irrevocable, worldwide license in the Software to
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#ifndef MAT3D_HPP
#define MAT3D_HPP 1


#include "vec3d.hpp"


class Mat3D {

    double a[9];

public:

    Mat3D();

    Mat3D( double a11, double a12, double a13,
           double a21, double a22, double a23,
           double a31, double a32, double a33 );

    ~Mat3D() {}


    double &operator()( int i ) {
        return( a[i] );
    }

    const double &operator()( int i ) const {
        return( a[i] );
    }
    
    double &operator()( int i, int j ) {
        return( a[3*i+j] );
    }

    const double &operator()( int i, int j ) const {
        return( a[3*i+j] );
    }

    double determinant( void ) const;

    Mat3D inverse( void ) const;

    Vec3D operator*( const Vec3D &x ) const;

    friend std::ostream &operator<<( std::ostream &os, const Mat3D &m );
};


#endif