gmres.h

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/* $Header: /var/cvs/mbdyn/mbdyn/mbdyn-1.0/mbdyn/base/gmres.h,v 1.24 2017/01/12 14:46:09 masarati Exp $ */
/* 
 * MBDyn (C) is a multibody analysis code. 
 * http://www.mbdyn.org
 *
 * Copyright (C) 1996-2017
 *
 * Pierangelo Masarati  <masarati@aero.polimi.it>
 * Paolo Mantegazza     <mantegazza@aero.polimi.it>
 *
 * Dipartimento di Ingegneria Aerospaziale - Politecnico di Milano
 * via La Masa, 34 - 20156 Milano, Italy
 * http://www.aero.polimi.it
 *
 * Changing this copyright notice is forbidden.
 *
 * 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 (version 2 of the License).
 * 
 *
 * 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
 
 /* 
  *
  * Copyright (C) 2003-2017
  * Giuseppe Quaranta   <quaranta@aero.polimi.it>
  *
  * classi che implementano la risoluzione del sistema nonlineare 
  */

#ifndef GMRES_H
#define GMRES_H

#include <fullmh.h>
#include <mfree.h>

class Gmres : public MatrixFreeSolver
{
private:
        MyVectorHandler *v;
        MyVectorHandler s, cs, sn, w, vHat, dx; 
        FullMatrixHandler H;

public:
        Gmres(const Preconditioner::PrecondType PType, 
                        const integer iPStep,
                        doublereal ITol,
                        integer MaxIt,
                        doublereal etaMx,
                        doublereal T,
                        const NonlinearSolverOptions& options);
        
        ~Gmres(void);
        
        virtual void Solve(const NonlinearProblem* NLP,
                        Solver* pS,
                        const integer iMaxIter,
                        const doublereal& Tol,
                        integer& iIterCnt,
                        doublereal& dErr,
                        const doublereal& SolTol,
                        doublereal& dSolErr);
                        
private:
        void GeneratePlaneRotation(const doublereal &dx, const doublereal &dy, 
                        doublereal &cs, doublereal &sn) const;
                        
        void ApplyPlaneRotation(doublereal &dx, doublereal &dy, 
                        const doublereal &cs, const doublereal &sn) const;

        /*
         * FIXME: we could eliminate x, s and v,
         * since they are now members of the class
         */     
        void Backsolve(VectorHandler& x, integer sz,
                        VectorHandler& s, MyVectorHandler* v);
};

#endif /* GMRES_H */