/*

Copyright (C) 1994, 1995, 1996, 1997, 2000, 2002, 2003, 2004, 2005,
              2007 John W. Eaton
Copyright (C) 2008 Jaroslav Hajek

This file is part of Octave.

Octave is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 3 of the License, or (at your
option) any later version.

Octave 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 General Public License
for more details.

You should have received a copy of the GNU General Public License
along with Octave; see the file COPYING.  If not, see
<http://www.gnu.org/licenses/>.

*/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <string>

#include "CmplxAEPBAL.h"
#include "dMatrix.h"
#include "f77-fcn.h"

extern "C"
{
  F77_RET_T
  F77_FUNC (zgebal, ZGEBAL) (F77_CONST_CHAR_ARG_DECL, const octave_idx_type&,
			     Complex*, const octave_idx_type&,
			     octave_idx_type&, octave_idx_type&, double*,
			     octave_idx_type& F77_CHAR_ARG_LEN_DECL);
 
  F77_RET_T
  F77_FUNC (zgebak, ZGEBAK) (F77_CONST_CHAR_ARG_DECL, F77_CONST_CHAR_ARG_DECL,
			     const octave_idx_type&, const octave_idx_type&,
			     const octave_idx_type&, const double*,
			     const octave_idx_type&, Complex*,
			     const octave_idx_type&, octave_idx_type&
			     F77_CHAR_ARG_LEN_DECL  F77_CHAR_ARG_LEN_DECL);
}

ComplexAEPBALANCE::ComplexAEPBALANCE (const ComplexMatrix& a, 
                                      bool noperm, bool noscal)
  : base_aepbal<ComplexMatrix, ColumnVector> ()
{
  octave_idx_type n = a.cols ();

  if (a.rows () != n)
    {
      (*current_liboctave_error_handler) ("AEPBALANCE requires square matrix");
      return;
    }

  octave_idx_type info;

  scale = ColumnVector (n);
  double *pscale = scale.fortran_vec ();

  balanced_mat = a;
  Complex *p_balanced_mat = balanced_mat.fortran_vec ();

  job = noperm ? (noscal ? 'N' : 'S') : (noscal ? 'P' : 'B');

  F77_XFCN (zgebal, ZGEBAL, (F77_CONST_CHAR_ARG2 (&job, 1),
			     n, p_balanced_mat, n, ilo, ihi,
			     pscale, info
			     F77_CHAR_ARG_LEN (1)));
}

ComplexMatrix
ComplexAEPBALANCE::balancing_matrix (void) const
{
  octave_idx_type n = balanced_mat.rows ();
  ComplexMatrix balancing_mat (n, n, 0.0);
  for (octave_idx_type i = 0; i < n; i++)
    balancing_mat.elem (i, i) = 1.0;

  Complex *p_balancing_mat = balancing_mat.fortran_vec ();
  const double *pscale = scale.fortran_vec ();

  octave_idx_type info;

  char side = 'R';

  F77_XFCN (zgebak, ZGEBAK, (F77_CONST_CHAR_ARG2 (&job, 1),
			     F77_CONST_CHAR_ARG2 (&side, 1),
			     n, ilo, ihi, pscale, n,
			     p_balancing_mat, n, info
			     F77_CHAR_ARG_LEN (1)
			     F77_CHAR_ARG_LEN (1)));

  return balancing_mat;
}

/*
;;; Local Variables: ***
;;; mode: C++ ***
;;; End: ***
*/