CPPLapack Code

//=============================================================================
/*! return transposed dgematrix */
inline _dsymatrix t(const dsymatrix& mat)
{
#ifdef  CPPL_VERBOSE
  std::cerr << "# [MARK] t(const dsymatrix&)"
            << std::endl;
#endif//CPPL_VERBOSE
  
#ifdef  CPPL_DEBUG
  std::cerr << "[WARNING] t(const dsymatrix&)" << std::endl
            << "This function call has no effect "
            << "since the matrix is symmetric." << std::endl;
#endif//CPPL_DEBUG
  
  dsymatrix newmat(mat);
  return _(newmat);
}

//=============================================================================
/*! return its inverse matrix */
inline _dgematrix i(const dsymatrix& mat)
{
#ifdef  CPPL_VERBOSE
  std::cerr << "# [MARK] i(const dsymatrix&)"
            << std::endl;
#endif//CPPL_VERBOSE
  
  dsymatrix mat_cp(mat);
  dgematrix mat_inv(mat.N,mat.N);
  mat_inv.identity();
  mat_cp.dsysv(mat_inv);
  
  return _(mat_inv);
}


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

//=============================================================================
/*! search the index of element having the largest absolute value
  in 0-based numbering system */
inline void idamax(long& i, long& j, const dsymatrix& mat)
{
#ifdef  CPPL_VERBOSE
  std::cerr << "# [MARK] idamax(long&, long&, const dsymatrix&)" << std::endl;
#endif//CPPL_VERBOSE
  
  i=j=0;
  double val(0.);
  for(long J=0; J<mat.N; J++){
    long I( J +idamax_(mat.M-J, mat.Darray[J]+J, 1) -1 );
    if( val<fabs(mat.Darray[J][I]) ){
      val =fabs(mat.Darray[J][I]);
      i=I;
      j=J;
    }
  }
}

//=============================================================================
/*! return its largest absolute value */
inline double damax(const dsymatrix& mat)
{
#ifdef  CPPL_VERBOSE
  std::cerr << "# [MARK] damax(const dsymatrix&)" << std::endl;
#endif//CPPL_VERBOSE
  
  long i,j;
  idamax(i, j, mat);
  return mat(i,j);
}