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/*
Copyright (C) 1994, 1995, 1996, 1997, 1999, 2000, 2002, 2003, 2004,
2005, 2007 John W. Eaton
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 <iostream>
#include "dbleSCHUR.h"
#include "f77-fcn.h"
#include "lo-error.h"
extern "C"
{
F77_RET_T
F77_FUNC (dgeesx, DGEESX) (F77_CONST_CHAR_ARG_DECL,
F77_CONST_CHAR_ARG_DECL,
SCHUR::select_function,
F77_CONST_CHAR_ARG_DECL,
const octave_idx_type&, double*, const octave_idx_type&, octave_idx_type&,
double*, double*, double*, const octave_idx_type&,
double&, double&, double*, const octave_idx_type&,
octave_idx_type*, const octave_idx_type&, octave_idx_type*, octave_idx_type&
F77_CHAR_ARG_LEN_DECL
F77_CHAR_ARG_LEN_DECL
F77_CHAR_ARG_LEN_DECL);
}
static octave_idx_type
select_ana (const double& a, const double&)
{
return (a < 0.0);
}
static octave_idx_type
select_dig (const double& a, const double& b)
{
return (hypot (a, b) < 1.0);
}
octave_idx_type
SCHUR::init (const Matrix& a, const std::string& ord, bool calc_unitary)
{
octave_idx_type a_nr = a.rows ();
octave_idx_type a_nc = a.cols ();
if (a_nr != a_nc)
{
(*current_liboctave_error_handler) ("SCHUR requires square matrix");
return -1;
}
// Workspace requirements may need to be fixed if any of the
// following change.
char jobvs;
char sense = 'N';
char sort = 'N';
if (calc_unitary)
jobvs = 'V';
else
jobvs = 'N';
char ord_char = ord.empty () ? 'U' : ord[0];
if (ord_char == 'A' || ord_char == 'D' || ord_char == 'a' || ord_char == 'd')
sort = 'S';
if (ord_char == 'A' || ord_char == 'a')
selector = select_ana;
else if (ord_char == 'D' || ord_char == 'd')
selector = select_dig;
else
selector = 0;
octave_idx_type n = a_nc;
octave_idx_type lwork = 8 * n;
octave_idx_type liwork = 1;
octave_idx_type info;
octave_idx_type sdim;
double rconde;
double rcondv;
schur_mat = a;
if (calc_unitary)
unitary_mat.resize (n, n);
double *s = schur_mat.fortran_vec ();
double *q = unitary_mat.fortran_vec ();
Array<double> wr (n);
double *pwr = wr.fortran_vec ();
Array<double> wi (n);
double *pwi = wi.fortran_vec ();
Array<double> work (lwork);
double *pwork = work.fortran_vec ();
// BWORK is not referenced for the non-ordered Schur routine.
Array<octave_idx_type> bwork ((ord_char == 'N' || ord_char == 'n') ? 0 : n);
octave_idx_type *pbwork = bwork.fortran_vec ();
Array<octave_idx_type> iwork (liwork);
octave_idx_type *piwork = iwork.fortran_vec ();
F77_XFCN (dgeesx, DGEESX, (F77_CONST_CHAR_ARG2 (&jobvs, 1),
F77_CONST_CHAR_ARG2 (&sort, 1),
selector,
F77_CONST_CHAR_ARG2 (&sense, 1),
n, s, n, sdim, pwr, pwi, q, n, rconde, rcondv,
pwork, lwork, piwork, liwork, pbwork, info
F77_CHAR_ARG_LEN (1)
F77_CHAR_ARG_LEN (1)
F77_CHAR_ARG_LEN (1)));
if (f77_exception_encountered)
(*current_liboctave_error_handler) ("unrecoverable error in dgeesx");
return info;
}
std::ostream&
operator << (std::ostream& os, const SCHUR& a)
{
os << a.schur_matrix () << "\n";
os << a.unitary_matrix () << "\n";
return os;
}
/*
;;; Local Variables: ***
;;; mode: C++ ***
;;; End: ***
*/
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