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VNLIterativeSparseSolverTraits.h

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00001 /*=========================================================================
00002 
00003   Program:   Insight Segmentation & Registration Toolkit
00004   Module:    $RCSfile: VNLIterativeSparseSolverTraits.h,v $
00005   Language:  C++
00006   Date:      $Date: 2008-10-04 12:30:27 $
00007   Version:   $Revision: 1.2 $
00008 
00009   Copyright (c) Insight Software Consortium. All rights reserved.
00010   See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.
00011 
00012      This software is distributed WITHOUT ANY WARRANTY; without even
00013      the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
00014      PURPOSE.  See the above copyright notices for more information.
00015 
00016 =========================================================================*/
00017 
00018 #ifndef __VNLIterativeSparseSolverTraits_h
00019 #define __VNLIterativeSparseSolverTraits_h
00020 
00021 #include <vnl/vnl_vector.h>
00022 #include <vnl/vnl_sparse_matrix.h>
00023 #include <vnl/vnl_sparse_matrix_linear_system.h>
00024 #include <vnl/algo/vnl_lsqr.h>
00025 
00026 template< typename T = double >
00027 class VNLIterativeSparseSolverTraits
00028 {
00029 public:
00030   typedef T                                   ValueType;
00031   typedef vnl_sparse_matrix< ValueType >      MatrixType;
00032   typedef vnl_vector< ValueType >             VectorType;
00033   typedef vnl_lsqr                            SolverType;
00034 
00035   VNLIterativeSparseSolverTraits() {}
00036   ~VNLIterativeSparseSolverTraits() {}
00037 
00038   bool IsDirectSolver() const
00039     {
00040     return false; 
00041     }
00042 
00043   MatrixType InitializeSparseMatrix( const unsigned int& iN ) const
00044     {
00045     return MatrixType( iN, iN );
00046     }
00047 
00048   VectorType InitializeVector( const unsigned int& iN ) const
00049     {
00050     return VectorType( iN );
00051     }
00052 
00053   void FillMatrix( MatrixType& iA, const unsigned int& iR, const unsigned int& iC, const ValueType& iV ) const
00054     {
00055     iA( iR, iC ) = iV;
00056     }
00057 
00058   void AddToMatrix(  MatrixType& iA, const unsigned int& iR, const unsigned int& iC, const ValueType& iV ) const
00059     {
00060     iA( iR, iC ) += iV;
00061     }
00062 
00063   bool Solve( const MatrixType& iA, const VectorType& iB, VectorType& oX ) const
00064     {
00065     typedef vnl_sparse_matrix_linear_system< ValueType > SparseLinearSystemType;
00066     SparseLinearSystemType system( iA, iB );
00067 
00068     SolverType solver( system );
00069     return solver.minimize( oX );
00070     }
00071 
00072   // no interest to use this method...
00073   bool Solve( const MatrixType& iA,
00074               const VectorType& iBx, const VectorType& iBy,
00075               VectorType& oX, VectorType& oY ) const
00076     {
00077     bool result1 = Solve( iA, iBx, oX );
00078     bool result2 = Solve( iA, iBy, oY );
00079     return( result1 && result2 );
00080     }
00081 
00082   bool Solve( const MatrixType& iA,
00083               const VectorType& iB,
00084               const long& iNbIter,
00085               VectorType& oX ) const
00086     {
00087     typedef vnl_sparse_matrix_linear_system< ValueType > SparseLinearSystemType;
00088     SparseLinearSystemType system( iA, iB );
00089 
00090     SolverType solver( system );
00091     solver.set_max_iterations( iNbIter );
00092     return solver.minimize( oX );
00093     }
00094 
00095 };
00096 
00097 #endif
00098 

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