diag_precond.hpp

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/* Copyright (c) 2005-2010,2012 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.
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 * NOTICE. This software was developed under partial funding from the
 * U.S.  Department of Energy.  As such, the U.S. Government has been
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#ifndef DIAG_PRECOND_HPP
#define DIAG_PRECOND_HPP 1


#include "crowmatrix.hpp"
#include "precond.hpp"


class Diag_Precond : public Precond {

    Vector diag;

    Diag_Precond( const Diag_Precond &pc ) {}
    const Diag_Precond &operator=( const Diag_Precond &pc ) { return( *this ); }

public:

    Diag_Precond();

    ~Diag_Precond() {};

    Diag_Precond *copy( void ) const { return( new Diag_Precond( *this ) ); }

    void prepare( const CRowMatrix &A );

    void construct( const CRowMatrix &A );

    void clear( void );

    bool is_prepared( void ) const { return( true ); }

    std::string typestring( void ) const;
    
    void solve( Vector &x, const Vector &b ) const;
};


#endif