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eig.cc
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1996-11-03
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/*
Copyright (C) 1996 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "EIG.h"
#include "defun-dld.h"
#include "error.h"
#include "gripes.h"
#include "help.h"
#include "oct-obj.h"
#include "utils.h"
DEFUN_DLD (eig, args, nargout,
"eig (X) or [V, D] = eig (X): compute eigenvalues and eigenvectors of X")
{
octave_value_list retval;
int nargin = args.length ();
if (nargin != 1 || nargout > 2)
{
print_usage ("eig");
return retval;
}
octave_value arg = args(0);
int nr = arg.rows ();
int nc = arg.columns ();
int arg_is_empty = empty_arg ("eig", nr, nc);
if (arg_is_empty < 0)
return retval;
else if (arg_is_empty > 0)
return octave_value_list (2, Matrix ());
if (nr != nc)
{
gripe_square_matrix_required ("eig");
return retval;
}
Matrix tmp;
ComplexMatrix ctmp;
EIG result;
if (arg.is_real_type ())
{
tmp = arg.matrix_value ();
if (error_state)
return retval;
else
result = EIG (tmp);
}
else if (arg.is_complex_type ())
{
ctmp = arg.complex_matrix_value ();
if (error_state)
return retval;
else
result = EIG (ctmp);
}
else
{
gripe_wrong_type_arg ("eig", tmp);
return retval;
}
if (nargout == 0 || nargout == 1)
{
retval(0) = result.eigenvalues (), 1;
}
else
{
// Blame it on Matlab.
ComplexDiagMatrix d (result.eigenvalues ());
retval(1) = d;
retval(0) = result.eigenvectors ();
}
return retval;
}
/*
;;; Local Variables: ***
;;; mode: C++ ***
;;; End: ***
*/