Cholesky.hh

/* 
This file is part of the BIAS library (Basic ImageAlgorithmS).

Copyright (C) 2003-2009    (see file CONTACT for details)
Multimediale Systeme der Informationsverarbeitung
Institut fuer Informatik
Christian-Albrechts-Universitaet Kiel


BIAS is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.

BIAS is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License
along with BIAS; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/


#ifndef _Cholesky_hh_
#define _Cholesky_hh_

#include "bias_config.h" 
#include <Base/Debug/Error.hh>
#include <Base/Math/Matrix.hh>
#include <Base/Math/tnt/cholesky.h>

namespace BIAS {
    /**
     * \class Cholesky
     * \brief Calculates the Cholesky decomposition of a matrix with TNT function.
     * Use the Function DecompositionExists() to check if a Decomposition
     * was possible. Use the function UpperTriangle to obtain the result.
     * \author BIAS
     */
  class BIASMathBase_EXPORT Cholesky
  {
  public:
    explicit Cholesky(Matrix<double> const &A);
    ~Cholesky() {};

    bool DecompositionExists();
    Matrix<double> UpperTriangle();

  protected:
    Matrix<double> L;
    bool exists;
  };

}

#endif /* _Cholesky_hh_ */