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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 "CmplxHESS.h"
#include "f77-fcn.h"
#include "lo-error.h"
extern "C"
{
F77_RET_T
F77_FUNC (zgebal, ZGEBAL) (F77_CONST_CHAR_ARG_DECL,
const int&, Complex*, const int&,
int&, int&, double*, int&
F77_CHAR_ARG_LEN_DECL);
F77_RET_T
F77_FUNC (zgehrd, ZGEHRD) (const int&, const int&, const int&,
Complex*, const int&, Complex*,
Complex*, const int&, int&);
F77_RET_T
F77_FUNC (zunghr, ZUNGHR) (const int&, const int&, const int&,
Complex*, const int&, Complex*,
Complex*, const int&, int&);
F77_RET_T
F77_FUNC (zgebak, ZGEBAK) (F77_CONST_CHAR_ARG_DECL,
F77_CONST_CHAR_ARG_DECL,
const int&, const int&, const int&, double*,
const int&, Complex*, const int&, int&
F77_CHAR_ARG_LEN_DECL
F77_CHAR_ARG_LEN_DECL);
}
int
ComplexHESS::init (const ComplexMatrix& a)
{
int a_nr = a.rows ();
int a_nc = a.cols ();
if (a_nr != a_nc)
{
(*current_liboctave_error_handler)
("ComplexHESS requires square matrix");
return -1;
}
char job = 'N';
char side = 'R';
int n = a_nc;
int lwork = 32 * n;
int info;
int ilo;
int ihi;
hess_mat = a;
Complex *h = hess_mat.fortran_vec ();
Array<double> scale (n);
double *pscale = scale.fortran_vec ();
F77_XFCN (zgebal, ZGEBAL, (F77_CONST_CHAR_ARG2 (&job, 1),
n, h, n, ilo, ihi, pscale, info
F77_CHAR_ARG_LEN (1)));
if (f77_exception_encountered)
(*current_liboctave_error_handler) ("unrecoverable error in zgebal");
else
{
Array<Complex> tau (n-1);
Complex *ptau = tau.fortran_vec ();
Array<Complex> work (lwork);
Complex *pwork = work.fortran_vec ();
F77_XFCN (zgehrd, ZGEHRD, (n, ilo, ihi, h, n, ptau, pwork, lwork, info));
if (f77_exception_encountered)
(*current_liboctave_error_handler) ("unrecoverable error in zgehrd");
else
{
unitary_hess_mat = hess_mat;
Complex *z = unitary_hess_mat.fortran_vec ();
F77_XFCN (zunghr, ZUNGHR, (n, ilo, ihi, z, n, ptau, pwork,
lwork, info));
if (f77_exception_encountered)
(*current_liboctave_error_handler)
("unrecoverable error in zunghr");
else
{
F77_XFCN (zgebak, ZGEBAK, (F77_CONST_CHAR_ARG2 (&job, 1),
F77_CONST_CHAR_ARG2 (&side, 1),
n, ilo, ihi, pscale, n, z, n, info
F77_CHAR_ARG_LEN (1)
F77_CHAR_ARG_LEN (1)));
if (f77_exception_encountered)
(*current_liboctave_error_handler)
("unrecoverable error in zgebak");
else
{
// If someone thinks of a more graceful way of
// doing this (or faster for that matter :-)),
// please let me know!
if (n > 2)
for (int j = 0; j < a_nc; j++)
for (int i = j+2; i < a_nr; i++)
hess_mat.elem (i, j) = 0;
}
}
}
}
return info;
}
/*
;;; Local Variables: ***
;;; mode: C++ ***
;;; End: ***
*/
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