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/*
Copyright (C) 1994, 1995, 1996, 1997, 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 "dbleHESS.h"
#include "f77-fcn.h"
#include "lo-error.h"
extern "C"
{
F77_RET_T
F77_FUNC (dgebal, DGEBAL) (F77_CONST_CHAR_ARG_DECL,
const octave_idx_type&, double*, const octave_idx_type&, octave_idx_type&,
octave_idx_type&, double*, octave_idx_type&
F77_CHAR_ARG_LEN_DECL);
F77_RET_T
F77_FUNC (dgehrd, DGEHRD) (const octave_idx_type&, const octave_idx_type&, const octave_idx_type&,
double*, const octave_idx_type&, double*, double*,
const octave_idx_type&, octave_idx_type&);
F77_RET_T
F77_FUNC (dorghr, DORGHR) (const octave_idx_type&, const octave_idx_type&, const octave_idx_type&,
double*, const octave_idx_type&, double*, double*,
const octave_idx_type&, octave_idx_type&);
F77_RET_T
F77_FUNC (dgebak, DGEBAK) (F77_CONST_CHAR_ARG_DECL,
F77_CONST_CHAR_ARG_DECL,
const octave_idx_type&, const octave_idx_type&, const octave_idx_type&, double*,
const octave_idx_type&, double*, const octave_idx_type&, octave_idx_type&
F77_CHAR_ARG_LEN_DECL
F77_CHAR_ARG_LEN_DECL);
}
octave_idx_type
HESS::init (const Matrix& a)
{
octave_idx_type a_nr = a.rows ();
octave_idx_type a_nc = a.cols ();
if (a_nr != a_nc)
{
(*current_liboctave_error_handler) ("HESS requires square matrix");
return -1;
}
char job = 'N';
char side = 'R';
octave_idx_type n = a_nc;
octave_idx_type lwork = 32 * n;
octave_idx_type info;
octave_idx_type ilo;
octave_idx_type ihi;
hess_mat = a;
double *h = hess_mat.fortran_vec ();
Array<double> scale (n);
double *pscale = scale.fortran_vec ();
F77_XFCN (dgebal, DGEBAL, (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 dgebal");
else
{
Array<double> tau (n-1);
double *ptau = tau.fortran_vec ();
Array<double> work (lwork);
double *pwork = work.fortran_vec ();
F77_XFCN (dgehrd, DGEHRD, (n, ilo, ihi, h, n, ptau, pwork,
lwork, info));
if (f77_exception_encountered)
(*current_liboctave_error_handler) ("unrecoverable error in dgehrd");
else
{
unitary_hess_mat = hess_mat;
double *z = unitary_hess_mat.fortran_vec ();
F77_XFCN (dorghr, DORGHR, (n, ilo, ihi, z, n, ptau, pwork,
lwork, info));
if (f77_exception_encountered)
(*current_liboctave_error_handler)
("unrecoverable error in dorghr");
else
{
F77_XFCN (dgebak, DGEBAK, (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 dgebak");
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 (octave_idx_type j = 0; j < a_nc; j++)
for (octave_idx_type i = j+2; i < a_nr; i++)
hess_mat.elem (i, j) = 0;
}
}
}
}
return info;
}
/*
;;; Local Variables: ***
;;; mode: C++ ***
;;; End: ***
*/
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