ifp_brelax.h

00001 /*@HEADER
00002 // ***********************************************************************
00003 // 
00004 //       Ifpack: Object-Oriented Algebraic Preconditioner Package
00005 //                 Copyright (2002) Sandia Corporation
00006 // 
00007 // Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
00008 // license for use of this work by or on behalf of the U.S. Government.
00009 // 
00010 // This library is free software; you can redistribute it and/or modify
00011 // it under the terms of the GNU Lesser General Public License as
00012 // published by the Free Software Foundation; either version 2.1 of the
00013 // License, or (at your option) any later version.
00014 //  
00015 // This library is distributed in the hope that it will be useful, but
00016 // WITHOUT ANY WARRANTY; without even the implied warranty of
00017 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00018 // Lesser General Public License for more details.
00019 //  
00020 // You should have received a copy of the GNU Lesser General Public
00021 // License along with this library; if not, write to the Free Software
00022 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
00023 // USA
00024 // Questions? Contact Michael A. Heroux (maherou@sandia.gov) 
00025 // 
00026 // ***********************************************************************
00027 //@HEADER
00028 */
00029 
00030 #ifndef _IFP_BRELAX_H_
00031 #define _IFP_BRELAX_H_
00032 
00033 #include "ifp_GlobalPrecon.h"
00034 
00035 class ifp_LocalMat;
00036 class ifp_BlockMat;
00037 
00038 class ifp_None : public ifp_GlobalPrecon
00039 {
00040 public:
00041     void setup(const ifp_BlockMat&) {};
00042     void apply (int nr, int nc, const double *u, int ldu, double *v, int ldv);
00043 };
00044 
00045 class ifp_BJacobi : public ifp_GlobalPrecon
00046 {
00047 private:
00048     const ifp_BlockMat *Ap;
00049     ifp_LocalMat **diag;  // inverse or factors of diagonal blocks
00050 
00051 public:
00052     ifp_BJacobi();
00053    ~ifp_BJacobi();
00054  
00055     void setup(const ifp_BlockMat& A);
00056     void apply (int, int, const double *, int, double *, int);
00057     double condest();
00058 };
00059 
00060 class ifp_BSOR_Base : public ifp_GlobalPrecon
00061 {
00062 protected:
00063     const ifp_BlockMat *Ap;
00064     ifp_LocalMat **diag;  // inverse or factors of diagonal blocks
00065     int    *idiag;
00066 
00067     double omega_;
00068     int iterations_;
00069 
00070 public:
00071     ifp_BSOR_Base();
00072     virtual ~ifp_BSOR_Base();
00073  
00074     double& omega() {return omega_;}
00075     int& iterations() {return iterations_;}
00076 
00077     void setup(const ifp_BlockMat& A, double omega = 1.0, int iterations = 1);
00078 };
00079 
00080 class ifp_BSOR : public ifp_BSOR_Base
00081 {
00082 public:
00083     ifp_BSOR() {};
00084    ~ifp_BSOR() {};
00085     void apply (int, int, const double *, int, double *, int);
00086 };
00087 
00088 class ifp_BSSOR : public ifp_BSOR_Base
00089 {
00090 public:
00091     ifp_BSSOR() {};
00092    ~ifp_BSSOR() {};
00093     void apply (int, int, const double *, int, double *, int);
00094 };
00095 
00096 #endif // _IFP_BRELAX_H_

Generated on Tue Jul 13 09:27:13 2010 for IFPACK by  doxygen 1.4.7