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f-chol.cc
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1996-09-28
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// f-chol.cc -*- C++ -*-
/*
Copyright (C) 1993, 1994, 1995 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, 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "dbleCHOL.h"
#include "CmplxCHOL.h"
#include "tree-const.h"
#include "user-prefs.h"
#include "gripes.h"
#include "error.h"
#include "utils.h"
#include "help.h"
#include "defun-dld.h"
DEFUN_DLD_BUILTIN ("chol", Fchol, Schol, 2, 1,
"R = chol (X): cholesky factorization")
{
Octave_object retval;
int nargin = args.length ();
if (nargin != 1 || nargout > 1)
{
print_usage ("chol");
return retval;
}
tree_constant arg = args(0);
int nr = arg.rows ();
int nc = arg.columns ();
int arg_is_empty = empty_arg ("chol", nr, nc);
if (arg_is_empty < 0)
return retval;
if (arg_is_empty > 0)
return Matrix ();
if (arg.is_real_type ())
{
Matrix m = arg.matrix_value ();
if (! error_state)
{
int info;
CHOL fact (m, info);
if (info != 0)
error ("chol: matrix not positive definite");
else
retval = fact.chol_matrix ();
}
}
else if (arg.is_complex_type ())
{
ComplexMatrix m = arg.complex_matrix_value ();
if (! error_state)
{
int info;
ComplexCHOL fact (m, info);
if (info != 0)
error ("chol: matrix not positive definite");
else
retval = fact.chol_matrix ();
}
}
else
{
gripe_wrong_type_arg ("chol", arg);
}
return retval;
}
/*
;;; Local Variables: ***
;;; mode: C++ ***
;;; page-delimiter: "^/\\*" ***
;;; End: ***
*/