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/*
Copyright (C) 1996, 1997 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 2, 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, write to the Free
Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301, USA.
*/
#if defined (__GNUG__) && defined (USE_PRAGMA_INTERFACE_IMPLEMENTATION)
#pragma implementation
#endif
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "CmplxSCHUR.h"
#include "f77-fcn.h"
#include "lo-error.h"
extern "C"
{
F77_RET_T
F77_FUNC (zgeesx, ZGEESX) (F77_CONST_CHAR_ARG_DECL,
F77_CONST_CHAR_ARG_DECL,
ComplexSCHUR::select_function,
F77_CONST_CHAR_ARG_DECL,
const int&, Complex*, const int&, int&,
Complex*, Complex*, const int&, double&,
double&, Complex*, const int&, double*, int*,
int&
F77_CHAR_ARG_LEN_DECL
F77_CHAR_ARG_LEN_DECL
F77_CHAR_ARG_LEN_DECL);
}
static int
select_ana (const Complex& a)
{
return a.real () < 0.0;
}
static int
select_dig (const Complex& a)
{
return (abs (a) < 1.0);
}
int
ComplexSCHUR::init (const ComplexMatrix& a, const std::string& ord,
bool calc_unitary)
{
int a_nr = a.rows ();
int a_nc = a.cols ();
if (a_nr != a_nc)
{
(*current_liboctave_error_handler)
("ComplexSCHUR 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;
int n = a_nc;
int lwork = 8 * n;
int info;
int sdim;
double rconde;
double rcondv;
schur_mat = a;
if (calc_unitary)
unitary_mat.resize (n, n);
Complex *s = schur_mat.fortran_vec ();
Complex *q = unitary_mat.fortran_vec ();
Array<double> rwork (n);
double *prwork = rwork.fortran_vec ();
Array<Complex> w (n);
Complex *pw = w.fortran_vec ();
Array<Complex> work (lwork);
Complex *pwork = work.fortran_vec ();
// BWORK is not referenced for non-ordered Schur.
Array<int> bwork ((ord_char == 'N' || ord_char == 'n') ? 0 : n);
int *pbwork = bwork.fortran_vec ();
F77_XFCN (zgeesx, ZGEESX, (F77_CONST_CHAR_ARG2 (&jobvs, 1),
F77_CONST_CHAR_ARG2 (&sort, 1),
selector,
F77_CONST_CHAR_ARG2 (&sense, 1),
n, s, n, sdim, pw, q, n, rconde, rcondv,
pwork, lwork, prwork, 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 zgeesx");
return info;
}
/*
;;; Local Variables: ***
;;; mode: C++ ***
;;; End: ***
*/
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