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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 "dbleCHOL.h"
#include "f77-fcn.h"
#include "lo-error.h"
extern "C"
{
F77_RET_T
F77_FUNC (dpotrf, DPOTRF) (F77_CONST_CHAR_ARG_DECL, const int&,
double*, const int&, int&
F77_CHAR_ARG_LEN_DECL);
}
int
CHOL::init (const Matrix& a)
{
int a_nr = a.rows ();
int a_nc = a.cols ();
if (a_nr != a_nc)
{
(*current_liboctave_error_handler) ("CHOL requires square matrix");
return -1;
}
int n = a_nc;
int info;
chol_mat = a;
double *h = chol_mat.fortran_vec ();
F77_XFCN (dpotrf, DPOTRF, (F77_CONST_CHAR_ARG2 ("U", 1),
n, h, n, info
F77_CHAR_ARG_LEN (1)));
if (f77_exception_encountered)
(*current_liboctave_error_handler) ("unrecoverable error in dpotrf");
else
{
// If someone thinks of a more graceful way of doing this (or
// faster for that matter :-)), please let me know!
if (n > 1)
for (int j = 0; j < a_nc; j++)
for (int i = j+1; i < a_nr; i++)
chol_mat.elem (i, j) = 0.0;
}
return info;
}
/*
;;; Local Variables: ***
;;; mode: C++ ***
;;; End: ***
*/
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