CPPLapack Code

//=============================================================================
template<long n>
inline double& dsymatrix_small<n>::operator()(const long& i, const long& j)
{
#ifdef  CPPL_DEBUG
  if(i<j){ std::cerr << "[ERROR]dsymatrix_small::operator(): i<j" << std::endl; exit(1); }
#endif
  //const long I(max(i,j)), J(min(i,j)); return array[(I*(I+1))/2 +J];
  return array[(i*(i+1))/2 +j];
}

//=============================================================================
template<long n>
inline double dsymatrix_small<n>::operator()(const long& i, const long& j) const
{
#ifdef  CPPL_DEBUG
  if(i<j){ std::cerr << "[ERROR]dsymatrix_small::operator(): i<j" << std::endl; exit(1); }
#endif
  //const long I(max(i,j)), J(min(i,j)); return array[(I*(I+1))/2 +J];
  return array[(i*(i+1))/2 +j];
}

///////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////
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//=============================================================================
template<long n>
inline std::ostream& operator<<(std::ostream& s, const dsymatrix_small<n>& A)
{
  s << std::setiosflags(std::ios::showpos);
  for(long i=0; i<n; i++){
    for(long j=0;   j<=i; j++){ s << " " << A(i,j) << " "<< std::flush; }
    for(long j=i+1; j<n;  j++){ s << "{" << A(j,i) << "}" << std::flush; }
    s << std::endl;
  }
  return s;
}

///////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////

//=============================================================================
template<long n>
inline void dsymatrix_small<n>::write(const char* filename) const
{
  std::ofstream ofs(filename, std::ios::trunc);
  ofs.setf(std::cout.flags());
  ofs.precision(std::cout.precision());
  ofs.width(std::cout.width());
  ofs.fill(std::cout.fill());
  ofs << "dsymatrix" << " " << n << std::endl;
  for(long i=0; i<n; i++){
    for(long j=0; j<=i; j++){
      ofs << operator()(i,j) << " ";
    }
    ofs << std::endl;
  }
  ofs.close();
}

//=============================================================================
template<long n>
inline void dsymatrix_small<n>::read(const char* filename)
{
  std::ifstream s(filename);
  if(!s){
    std::cerr << "[ERROR] dsymatrix::read(const char*) " << std::endl
              << "The file \"" << filename << "\" can not be opened." << std::endl;
    exit(1);
  }
  
  std::string id;
  s >> id;
  if( id != "dsymatrix" ){
    std::cerr << "[ERROR] dsymatrix::read(const char*) " << std::endl
              << "The type name of the file \"" << filename << "\" is not dsymatrix." << std::endl
              << "Its type name was " << id << " ." << std::endl;
    exit(1);
  }
  
  long N;
  s >> N;
  if(N!=n){
    std::cerr << "[ERROR] dsymatrix_small::read(const char*) " << std::endl
              << "Matrix size is invalid." << std::endl;
    exit(1);
  }
  
  for(long i=0; i<n; i++){
    for(long j=0; j<=i; j++ ){
      s >> operator()(i,j);
    }
  }
  if(s.eof()){
    std::cerr << "[ERROR] dsymatrix::read(const char*) " << std::endl
              << "There is something is wrong with the file \"" << filename << "\"." << std::endl
              << "Most likely, there is a lack of data components, or a linefeed code or space code is missing at the end of the last line." << std::endl;
    exit(1);
  }
  
  s.close();
}