Initial import of eigen 3.1.1
Added a README.android and a MODULE_LICENSE_MPL2 file.
Added empty Android.mk and CleanSpec.mk to optimize Android build.
Non MPL2 license code is disabled in ./Eigen/src/Core/util/NonMPL2.h.
Trying to include such files will lead to an error.
Change-Id: I0e148b7c3e83999bcc4dfaa5809d33bfac2aac32
diff --git a/unsupported/Eigen/src/SparseExtra/MatrixMarketIterator.h b/unsupported/Eigen/src/SparseExtra/MatrixMarketIterator.h
new file mode 100644
index 0000000..4716b68
--- /dev/null
+++ b/unsupported/Eigen/src/SparseExtra/MatrixMarketIterator.h
@@ -0,0 +1,221 @@
+
+// This file is part of Eigen, a lightweight C++ template library
+// for linear algebra.
+//
+// Copyright (C) 2012 Desire NUENTSA WAKAM <desire.nuentsa_wakam@inria.fr>
+//
+// This Source Code Form is subject to the terms of the Mozilla
+// Public License v. 2.0. If a copy of the MPL was not distributed
+// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef EIGEN_BROWSE_MATRICES_H
+#define EIGEN_BROWSE_MATRICES_H
+
+namespace Eigen {
+
+enum {
+ SPD = 0x100,
+ NonSymmetric = 0x0
+};
+
+/**
+ * @brief Iterator to browse matrices from a specified folder
+ *
+ * This is used to load all the matrices from a folder.
+ * The matrices should be in Matrix Market format
+ * It is assumed that the matrices are named as matname.mtx
+ * and matname_SPD.mtx if the matrix is Symmetric and positive definite (or Hermitian)
+ * The right hand side vectors are loaded as well, if they exist.
+ * They should be named as matname_b.mtx.
+ * Note that the right hand side for a SPD matrix is named as matname_SPD_b.mtx
+ *
+ * Sometimes a reference solution is available. In this case, it should be named as matname_x.mtx
+ *
+ * Sample code
+ * \code
+ *
+ * \endcode
+ *
+ * \tparam Scalar The scalar type
+ */
+template <typename Scalar>
+class MatrixMarketIterator
+{
+ public:
+ typedef Matrix<Scalar,Dynamic,1> VectorType;
+ typedef SparseMatrix<Scalar,ColMajor> MatrixType;
+
+ public:
+ MatrixMarketIterator(const std::string folder):m_sym(0),m_isvalid(false),m_matIsLoaded(false),m_hasRhs(false),m_hasrefX(false),m_folder(folder)
+ {
+ m_folder_id = opendir(folder.c_str());
+ if (!m_folder_id){
+ m_isvalid = false;
+ std::cerr << "The provided Matrix folder could not be opened \n\n";
+ abort();
+ }
+ Getnextvalidmatrix();
+ }
+
+ ~MatrixMarketIterator()
+ {
+ if (m_folder_id) closedir(m_folder_id);
+ }
+
+ inline MatrixMarketIterator& operator++()
+ {
+ m_matIsLoaded = false;
+ m_hasrefX = false;
+ m_hasRhs = false;
+ Getnextvalidmatrix();
+ return *this;
+ }
+ inline operator bool() const { return m_isvalid;}
+
+ /** Return the sparse matrix corresponding to the current file */
+ inline MatrixType& matrix()
+ {
+ // Read the matrix
+ if (m_matIsLoaded) return m_mat;
+
+ std::string matrix_file = m_folder + "/" + m_matname + ".mtx";
+ if ( !loadMarket(m_mat, matrix_file))
+ {
+ m_matIsLoaded = false;
+ return m_mat;
+ }
+ m_matIsLoaded = true;
+
+ if (m_sym != NonSymmetric)
+ { // Store the upper part of the matrix. It is needed by the solvers dealing with nonsymmetric matrices ??
+ MatrixType B;
+ B = m_mat;
+ m_mat = B.template selfadjointView<Lower>();
+ }
+ return m_mat;
+ }
+
+ /** Return the right hand side corresponding to the current matrix.
+ * If the rhs file is not provided, a random rhs is generated
+ */
+ inline VectorType& rhs()
+ {
+ // Get the right hand side
+ if (m_hasRhs) return m_rhs;
+
+ std::string rhs_file;
+ rhs_file = m_folder + "/" + m_matname + "_b.mtx"; // The pattern is matname_b.mtx
+ m_hasRhs = Fileexists(rhs_file);
+ if (m_hasRhs)
+ {
+ m_rhs.resize(m_mat.cols());
+ m_hasRhs = loadMarketVector(m_rhs, rhs_file);
+ }
+ if (!m_hasRhs)
+ {
+ // Generate a random right hand side
+ if (!m_matIsLoaded) this->matrix();
+ m_refX.resize(m_mat.cols());
+ m_refX.setRandom();
+ m_rhs = m_mat * m_refX;
+ m_hasrefX = true;
+ m_hasRhs = true;
+ }
+ return m_rhs;
+ }
+
+ /** Return a reference solution
+ * If it is not provided and if the right hand side is not available
+ * then refX is randomly generated such that A*refX = b
+ * where A and b are the matrix and the rhs.
+ * Note that when a rhs is provided, refX is not available
+ */
+ inline VectorType& refX()
+ {
+ // Check if a reference solution is provided
+ if (m_hasrefX) return m_refX;
+
+ std::string lhs_file;
+ lhs_file = m_folder + "/" + m_matname + "_x.mtx";
+ m_hasrefX = Fileexists(lhs_file);
+ if (m_hasrefX)
+ {
+ m_refX.resize(m_mat.cols());
+ m_hasrefX = loadMarketVector(m_refX, lhs_file);
+ }
+ return m_refX;
+ }
+
+ inline std::string& matname() { return m_matname; }
+
+ inline int sym() { return m_sym; }
+
+ inline bool hasRhs() {return m_hasRhs; }
+ inline bool hasrefX() {return m_hasrefX; }
+
+ protected:
+
+ inline bool Fileexists(std::string file)
+ {
+ std::ifstream file_id(file.c_str());
+ if (!file_id.good() )
+ {
+ return false;
+ }
+ else
+ {
+ file_id.close();
+ return true;
+ }
+ }
+
+ void Getnextvalidmatrix( )
+ {
+ m_isvalid = false;
+ // Here, we return with the next valid matrix in the folder
+ while ( (m_curs_id = readdir(m_folder_id)) != NULL) {
+ m_isvalid = false;
+ std::string curfile;
+ curfile = m_folder + "/" + m_curs_id->d_name;
+ // Discard if it is a folder
+ if (m_curs_id->d_type == DT_DIR) continue; //FIXME This may not be available on non BSD systems
+// struct stat st_buf;
+// stat (curfile.c_str(), &st_buf);
+// if (S_ISDIR(st_buf.st_mode)) continue;
+
+ // Determine from the header if it is a matrix or a right hand side
+ bool isvector,iscomplex;
+ if(!getMarketHeader(curfile,m_sym,iscomplex,isvector)) continue;
+ if(isvector) continue;
+
+ // Get the matrix name
+ std::string filename = m_curs_id->d_name;
+ m_matname = filename.substr(0, filename.length()-4);
+
+ // Find if the matrix is SPD
+ size_t found = m_matname.find("SPD");
+ if( (found!=std::string::npos) && (m_sym != NonSymmetric) )
+ m_sym = SPD;
+
+ m_isvalid = true;
+ break;
+ }
+ }
+ int m_sym; // Symmetry of the matrix
+ MatrixType m_mat; // Current matrix
+ VectorType m_rhs; // Current vector
+ VectorType m_refX; // The reference solution, if exists
+ std::string m_matname; // Matrix Name
+ bool m_isvalid;
+ bool m_matIsLoaded; // Determine if the matrix has already been loaded from the file
+ bool m_hasRhs; // The right hand side exists
+ bool m_hasrefX; // A reference solution is provided
+ std::string m_folder;
+ DIR * m_folder_id;
+ struct dirent *m_curs_id;
+
+};
+
+} // end namespace Eigen
+
+#endif