IO.h
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00001 // This file is part of Eigen, a lightweight C++ template library
00002 // for linear algebra.
00003 //
00004 // Copyright (C) 2006-2008 Benoit Jacob <jacob.benoit.1@gmail.com>
00005 // Copyright (C) 2008 Gael Guennebaud <gael.guennebaud@inria.fr>
00006 //
00007 // Eigen is free software; you can redistribute it and/or
00008 // modify it under the terms of the GNU Lesser General Public
00009 // License as published by the Free Software Foundation; either
00010 // version 3 of the License, or (at your option) any later version.
00011 //
00012 // Alternatively, you can redistribute it and/or
00013 // modify it under the terms of the GNU General Public License as
00014 // published by the Free Software Foundation; either version 2 of
00015 // the License, or (at your option) any later version.
00016 //
00017 // Eigen is distributed in the hope that it will be useful, but WITHOUT ANY
00018 // WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
00019 // FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License or the
00020 // GNU General Public License for more details.
00021 //
00022 // You should have received a copy of the GNU Lesser General Public
00023 // License and a copy of the GNU General Public License along with
00024 // Eigen. If not, see <http://www.gnu.org/licenses/>.
00025 
00026 #ifndef EIGEN_IO_H
00027 #define EIGEN_IO_H
00028 
00029 enum { DontAlignCols = 1 };
00030 enum { StreamPrecision = -1,
00031        FullPrecision = -2 };
00032 
00033 namespace internal {
00034 template<typename Derived>
00035 std::ostream & print_matrix(std::ostream & s, const Derived& _m, const IOFormat& fmt);
00036 }
00037 
00063 struct IOFormat
00064 {
00066   IOFormat(int _precision = StreamPrecision, int _flags = 0,
00067     const std::string& _coeffSeparator = " ",
00068     const std::string& _rowSeparator = "\n", const std::string& _rowPrefix="", const std::string& _rowSuffix="",
00069     const std::string& _matPrefix="", const std::string& _matSuffix="")
00070   : matPrefix(_matPrefix), matSuffix(_matSuffix), rowPrefix(_rowPrefix), rowSuffix(_rowSuffix), rowSeparator(_rowSeparator),
00071     coeffSeparator(_coeffSeparator), precision(_precision), flags(_flags)
00072   {
00073     rowSpacer = "";
00074     int i = int(matSuffix.length())-1;
00075     while (i>=0 && matSuffix[i]!='\n')
00076     {
00077       rowSpacer += ' ';
00078       i--;
00079     }
00080   }
00081   std::string matPrefix, matSuffix;
00082   std::string rowPrefix, rowSuffix, rowSeparator, rowSpacer;
00083   std::string coeffSeparator;
00084   int precision;
00085   int flags;
00086 };
00087 
00103 template<typename ExpressionType>
00104 class WithFormat
00105 {
00106   public:
00107 
00108     WithFormat(const ExpressionType& matrix, const IOFormat& format)
00109       : m_matrix(matrix), m_format(format)
00110     {}
00111 
00112     friend std::ostream & operator << (std::ostream & s, const WithFormat& wf)
00113     {
00114       return internal::print_matrix(s, wf.m_matrix.eval(), wf.m_format);
00115     }
00116 
00117   protected:
00118     const typename ExpressionType::Nested m_matrix;
00119     IOFormat m_format;
00120 };
00121 
00129 template<typename Derived>
00130 inline const WithFormat<Derived>
00131 DenseBase<Derived>::format(const IOFormat& fmt) const
00132 {
00133   return WithFormat<Derived>(derived(), fmt);
00134 }
00135 
00136 namespace internal {
00137 
00138 template<typename Scalar, bool IsInteger>
00139 struct significant_decimals_default_impl
00140 {
00141   typedef typename NumTraits<Scalar>::Real RealScalar;
00142   static inline int run()
00143   {
00144     using std::ceil;
00145     return cast<RealScalar,int>(ceil(-log(NumTraits<RealScalar>::epsilon())/log(RealScalar(10))));
00146   }
00147 };
00148 
00149 template<typename Scalar>
00150 struct significant_decimals_default_impl<Scalar, true>
00151 {
00152   static inline int run()
00153   {
00154     return 0;
00155   }
00156 };
00157 
00158 template<typename Scalar>
00159 struct significant_decimals_impl
00160   : significant_decimals_default_impl<Scalar, NumTraits<Scalar>::IsInteger>
00161 {};
00162 
00165 template<typename Derived>
00166 std::ostream & print_matrix(std::ostream & s, const Derived& _m, const IOFormat& fmt)
00167 {
00168   if(_m.size() == 0)
00169   {
00170     s << fmt.matPrefix << fmt.matSuffix;
00171     return s;
00172   }
00173   
00174   const typename Derived::Nested m = _m;
00175   typedef typename Derived::Scalar Scalar;
00176   typedef typename Derived::Index Index;
00177 
00178   Index width = 0;
00179 
00180   std::streamsize explicit_precision;
00181   if(fmt.precision == StreamPrecision)
00182   {
00183     explicit_precision = 0;
00184   }
00185   else if(fmt.precision == FullPrecision)
00186   {
00187     if (NumTraits<Scalar>::IsInteger)
00188     {
00189       explicit_precision = 0;
00190     }
00191     else
00192     {
00193       explicit_precision = significant_decimals_impl<Scalar>::run();
00194     }
00195   }
00196   else
00197   {
00198     explicit_precision = fmt.precision;
00199   }
00200 
00201   bool align_cols = !(fmt.flags & DontAlignCols);
00202   if(align_cols)
00203   {
00204     // compute the largest width
00205     for(Index j = 1; j < m.cols(); ++j)
00206       for(Index i = 0; i < m.rows(); ++i)
00207       {
00208         std::stringstream sstr;
00209         if(explicit_precision) sstr.precision(explicit_precision);
00210         sstr << m.coeff(i,j);
00211         width = std::max<Index>(width, Index(sstr.str().length()));
00212       }
00213   }
00214   std::streamsize old_precision = 0;
00215   if(explicit_precision) old_precision = s.precision(explicit_precision);
00216   s << fmt.matPrefix;
00217   for(Index i = 0; i < m.rows(); ++i)
00218   {
00219     if (i)
00220       s << fmt.rowSpacer;
00221     s << fmt.rowPrefix;
00222     if(width) s.width(width);
00223     s << m.coeff(i, 0);
00224     for(Index j = 1; j < m.cols(); ++j)
00225     {
00226       s << fmt.coeffSeparator;
00227       if (width) s.width(width);
00228       s << m.coeff(i, j);
00229     }
00230     s << fmt.rowSuffix;
00231     if( i < m.rows() - 1)
00232       s << fmt.rowSeparator;
00233   }
00234   s << fmt.matSuffix;
00235   if(explicit_precision) s.precision(old_precision);
00236   return s;
00237 }
00238 
00239 } // end namespace internal
00240 
00252 template<typename Derived>
00253 std::ostream & operator <<
00254 (std::ostream & s,
00255  const DenseBase<Derived> & m)
00256 {
00257   return internal::print_matrix(s, m.eval(), EIGEN_DEFAULT_IO_FORMAT);
00258 }
00259 
00260 #endif // EIGEN_IO_H


libicr
Author(s): Robert Krug
autogenerated on Mon Jan 6 2014 11:32:51