CPPLapack Code

//=============================================================================
/*! return transposed _dsymatrix */
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
  
  return mat;
}

//=============================================================================
/*! return its inverse matrix */
inline _dsymatrix i(const _dsymatrix& mat)
{
#ifdef  CPPL_VERBOSE
  std::cerr << "# [MARK] i(const _dsymatrix&)" << std::endl;
#endif//CPPL_VERBOSE
  
  dsymatrix mat_cp(mat);
  dsymatrix mat_inv(mat_cp.n);
  mat_inv.identity();
  
  char UPLO('L');
  long NRHS(mat.N), LDA(mat.N), *IPIV(new long[mat.N]), LDB(mat.N), LWORK(-1), INFO(1);
  double *WORK( new double[1] );
  dsysv_(UPLO, mat_cp.n, NRHS, mat_cp.array, LDA, IPIV, mat_inv.array, LDB, WORK, LWORK, INFO);
  LWORK = long(WORK[0]);
  delete [] WORK;  WORK = new double[LWORK];
  dsysv_(UPLO, mat_cp.n, NRHS, mat_cp.array, LDA, IPIV, mat_inv.array, LDB, WORK, LWORK, INFO);
  delete [] WORK; delete [] IPIV;
  if(INFO!=0){
    std::cerr << "[WARNING] i(dsymatrix&) Serious trouble happend. INFO = " << INFO << "." << std::endl;
  }
  
  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
  
  dsymatrix newmat(mat);
  idamax(i, j, newmat);
}

//=============================================================================
/*! 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
  
  dsymatrix newmat(mat);
  return damax(newmat);
}