MatrixMarketIterator.h
Go to the documentation of this file.
00001 
00002 // This file is part of Eigen, a lightweight C++ template library
00003 // for linear algebra.
00004 //
00005 // Copyright (C) 2012 Desire NUENTSA WAKAM <desire.nuentsa_wakam@inria.fr>
00006 //
00007 // This Source Code Form is subject to the terms of the Mozilla
00008 // Public License v. 2.0. If a copy of the MPL was not distributed
00009 // with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
00010 
00011 #ifndef EIGEN_BROWSE_MATRICES_H
00012 #define EIGEN_BROWSE_MATRICES_H
00013 
00014 namespace Eigen {
00015 
00016 enum {
00017   SPD = 0x100,
00018   NonSymmetric = 0x0
00019 }; 
00020 
00041 template <typename Scalar>
00042 class MatrixMarketIterator 
00043 {
00044   public:
00045     typedef Matrix<Scalar,Dynamic,1> VectorType; 
00046     typedef SparseMatrix<Scalar,ColMajor> MatrixType; 
00047   
00048   public:
00049     MatrixMarketIterator(const std::string folder):m_sym(0),m_isvalid(false),m_matIsLoaded(false),m_hasRhs(false),m_hasrefX(false),m_folder(folder)
00050     {
00051       m_folder_id = opendir(folder.c_str());
00052       if (!m_folder_id){
00053         m_isvalid = false;
00054         std::cerr << "The provided Matrix folder could not be opened \n\n";
00055         abort();
00056       }
00057       Getnextvalidmatrix();
00058     }
00059     
00060     ~MatrixMarketIterator()
00061     {
00062       if (m_folder_id) closedir(m_folder_id); 
00063     }
00064     
00065     inline MatrixMarketIterator& operator++()
00066     {
00067       m_matIsLoaded = false;
00068       m_hasrefX = false;
00069       m_hasRhs = false;
00070       Getnextvalidmatrix();
00071       return *this;
00072     }
00073     inline operator bool() const { return m_isvalid;}
00074     
00076     inline MatrixType& matrix() 
00077     { 
00078       // Read the matrix
00079       if (m_matIsLoaded) return m_mat;
00080       
00081       std::string matrix_file = m_folder + "/" + m_matname + ".mtx";
00082       if ( !loadMarket(m_mat, matrix_file)) 
00083       {
00084         m_matIsLoaded = false;
00085         return m_mat;
00086       }
00087       m_matIsLoaded = true; 
00088       
00089       if (m_sym != NonSymmetric) 
00090       { // Store the upper part of the matrix. It is needed by the solvers dealing with nonsymmetric matrices ??
00091         MatrixType B; 
00092         B = m_mat;
00093         m_mat = B.template selfadjointView<Lower>();
00094       }
00095       return m_mat; 
00096     }
00097     
00101     inline VectorType& rhs() 
00102     { 
00103        // Get the right hand side
00104       if (m_hasRhs) return m_rhs;
00105       
00106       std::string rhs_file;
00107       rhs_file = m_folder + "/" + m_matname + "_b.mtx"; // The pattern is matname_b.mtx
00108       m_hasRhs = Fileexists(rhs_file);
00109       if (m_hasRhs)
00110       {
00111         m_rhs.resize(m_mat.cols());
00112         m_hasRhs = loadMarketVector(m_rhs, rhs_file);
00113       }
00114       if (!m_hasRhs)
00115       {
00116         // Generate a random right hand side
00117         if (!m_matIsLoaded) this->matrix(); 
00118         m_refX.resize(m_mat.cols());
00119         m_refX.setRandom();
00120         m_rhs = m_mat * m_refX;
00121         m_hasrefX = true;
00122         m_hasRhs = true;
00123       }
00124       return m_rhs; 
00125     }
00126     
00133     inline VectorType& refX() 
00134     { 
00135       // Check if a reference solution is provided
00136       if (m_hasrefX) return m_refX;
00137       
00138       std::string lhs_file;
00139       lhs_file = m_folder + "/" + m_matname + "_x.mtx"; 
00140       m_hasrefX = Fileexists(lhs_file);
00141       if (m_hasrefX)
00142       {
00143         m_refX.resize(m_mat.cols());
00144         m_hasrefX = loadMarketVector(m_refX, lhs_file);
00145       }
00146       return m_refX; 
00147     }
00148     
00149     inline std::string& matname() { return m_matname; }
00150     
00151     inline int sym() { return m_sym; }
00152     
00153     inline bool hasRhs() {return m_hasRhs; }
00154     inline bool hasrefX() {return m_hasrefX; }
00155     
00156   protected:
00157     
00158     inline bool Fileexists(std::string file)
00159     {
00160       std::ifstream file_id(file.c_str());
00161       if (!file_id.good() ) 
00162       {
00163         return false;
00164       }
00165       else 
00166       {
00167         file_id.close();
00168         return true;
00169       }
00170     }
00171     
00172     void Getnextvalidmatrix( )
00173     {
00174       m_isvalid = false;
00175       // Here, we return with the next valid matrix in the folder
00176       while ( (m_curs_id = readdir(m_folder_id)) != NULL) {
00177         m_isvalid = false;
00178         std::string curfile;
00179         curfile = m_folder + "/" + m_curs_id->d_name;
00180         // Discard if it is a folder
00181         if (m_curs_id->d_type == DT_DIR) continue; //FIXME This may not be available on non BSD systems
00182 //         struct stat st_buf; 
00183 //         stat (curfile.c_str(), &st_buf);
00184 //         if (S_ISDIR(st_buf.st_mode)) continue;
00185         
00186         // Determine from the header if it is a matrix or a right hand side 
00187         bool isvector,iscomplex;
00188         if(!getMarketHeader(curfile,m_sym,iscomplex,isvector)) continue;
00189         if(isvector) continue;
00190         
00191         // Get the matrix name
00192         std::string filename = m_curs_id->d_name;
00193         m_matname = filename.substr(0, filename.length()-4); 
00194         
00195         // Find if the matrix is SPD 
00196         size_t found = m_matname.find("SPD");
00197         if( (found!=std::string::npos) && (m_sym != NonSymmetric) )
00198           m_sym = SPD;
00199        
00200         m_isvalid = true;
00201         break; 
00202       }
00203     }
00204     int m_sym; // Symmetry of the matrix
00205     MatrixType m_mat; // Current matrix  
00206     VectorType m_rhs;  // Current vector
00207     VectorType m_refX; // The reference solution, if exists
00208     std::string m_matname; // Matrix Name
00209     bool m_isvalid; 
00210     bool m_matIsLoaded; // Determine if the matrix has already been loaded from the file
00211     bool m_hasRhs; // The right hand side exists
00212     bool m_hasrefX; // A reference solution is provided
00213     std::string m_folder;
00214     DIR * m_folder_id;
00215     struct dirent *m_curs_id; 
00216     
00217 };
00218 
00219 } // end namespace Eigen
00220 
00221 #endif


win_eigen
Author(s): Daniel Stonier
autogenerated on Mon Oct 6 2014 12:25:20