/*

Copyright (C) 2009 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 "base-qr.h"

template <class qr_type>
base_qr<qr_type>::base_qr (const qr_type& q_arg, const qr_type& r_arg)
{
  octave_idx_type qr = q_arg.rows (), qc = q_arg.columns ();
  octave_idx_type rr = r_arg.rows (), rc = r_arg.columns ();
  if (qc == rr && (qr == qc || (qr > qc && rr == rc)))
    {
      q = q_arg;
      r = r_arg;
    }
  else
    (*current_liboctave_error_handler) ("QR dimensions mismatch");
}

template <class qr_type>
qr_type_t
base_qr<qr_type>::get_type (void) const
{
  qr_type_t retval;
  if (!q.is_empty () && q.is_square ())
    retval = qr_type_std;
  else if (q.rows () > q.columns () && r.is_square ())
    retval = qr_type_economy;
  else
    retval = qr_type_raw;
  return retval;
}

template <class qr_type>
bool
base_qr<qr_type>::regular (void) const
{
  octave_idx_type k = std::min (r.rows (), r.columns ());
  bool retval = true;
  for (octave_idx_type i = 0; i < k; i++)
    if (r(i, i) == qr_elt_type ())
      {
        retval = false;
        break;
      }

  return true;
}