_dsymatrix-calc.hpp File Reference

Go to the source code of this file.

Functions
_dsymatrix	t (const _dsymatrix &mat)
_dsymatrix	i (const _dsymatrix &mat)
void	idamax (CPPL_INT &i, CPPL_INT &j, const _dsymatrix &mat)
double	damax (const _dsymatrix &mat)

Function Documentation

_dsymatrix t ( const _dsymatrix &  mat )

inline

return transposed _dsymatrix

Definition at line 3 of file _dsymatrix-calc.hpp.

{CPPL_VERBOSE_REPORT;
#ifdef  CPPL_DEBUG
  WARNING_REPORT;
  std::cerr << "This function call has no effect since the matrix is symmetric." << std::endl;
#endif//CPPL_DEBUG
  
  return mat;
}

_dsymatrix i ( const _dsymatrix &  mat )

inline

return its inverse matrix

Definition at line 15 of file _dsymatrix-calc.hpp.

References _(), dsymatrix::array, dsymatrix::identity(), dsymatrix::n, and _dsymatrix::n.

{CPPL_VERBOSE_REPORT;
  dsymatrix mat_cp(mat);
  dsymatrix mat_inv(mat_cp.n);
  mat_inv.identity();
  
  char UPLO('l');
  CPPL_INT NRHS(mat.n), LDA(mat.n), *IPIV(new CPPL_INT[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 = CPPL_INT(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){
    WARNING_REPORT;
    std::cerr << "Serious trouble happend. INFO = " << INFO << "." << std::endl;
  }
  
  return _(mat_inv);
}

void idamax ( CPPL_INT &  i, CPPL_INT &  j, const _dsymatrix &  mat  )

inline

search the index of element having the largest absolute value in 0-based numbering system

Definition at line 48 of file _dsymatrix-calc.hpp.

{CPPL_VERBOSE_REPORT;
  dsymatrix newmat =mat;
  idamax(i, j, newmat);
}

double damax ( const _dsymatrix &  mat )

inline

return its largest absolute value

Definition at line 56 of file _dsymatrix-calc.hpp.

{CPPL_VERBOSE_REPORT;
  dsymatrix newmat =mat;
  return damax(newmat);
}