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schur.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 <string>
#include "CmplxSCHUR.h"
#include "dbleSCHUR.h"
#include "defun-dld.h"
#include "error.h"
#include "gripes.h"
#include "help.h"
#include "oct-obj.h"
#include "utils.h"
DEFUN_DLD (schur, args, nargout,
"[U, S] = schur (A) or S = schur (A)\n\
\n\
or, for ordered Schur:\n\
\n\
[U, S] = schur (A, TYPE) or S = schur (A, TYPE)\n\
where TYPE is a string that begins with one of the following\n\
characters:\n\
\n\
A = continuous time poles\n\
D = discrete time poles\n\
U = unordered schur (default)")
{
octave_value_list retval;
int nargin = args.length ();
if (nargin < 1 || nargin > 2 || nargout > 2)
{
print_usage ("schur");
return retval;
}
octave_value arg = args(0);
string ord;
if (nargin == 2)
{
ord = args(1).string_value ();
if (error_state)
{
error ("schur: expecting string as second argument");
return retval;
}
}
char ord_char = ord.empty () ? 'U' : ord[0];
if (ord_char != 'U' && ord_char != 'A' && ord_char != 'D'
&& ord_char != 'u' && ord_char != 'a' && ord_char != 'd')
{
warning ("schur: incorrect ordered schur argument `%c'",
ord.c_str ());
return retval;
}
int nr = arg.rows ();
int nc = arg.columns ();
int arg_is_empty = empty_arg ("schur", 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 ("schur");
return retval;
}
if (arg.is_real_type ())
{
Matrix tmp = arg.matrix_value ();
if (! error_state)
{
SCHUR result (tmp, ord);
if (nargout == 0 || nargout == 1)
{
retval(0) = result.schur_matrix ();
}
else
{
retval(1) = result.schur_matrix ();
retval(0) = result.unitary_matrix ();
}
}
}
else if (arg.is_complex_type ())
{
ComplexMatrix ctmp = arg.complex_matrix_value ();
if (! error_state)
{
ComplexSCHUR result (ctmp, ord);
if (nargout == 0 || nargout == 1)
{
retval(0) = result.schur_matrix ();
}
else
{
retval(1) = result.schur_matrix ();
retval(0) = result.unitary_matrix ();
}
}
}
else
{
gripe_wrong_type_arg ("schur", arg);
}
return retval;
}
/*
;;; Local Variables: ***
;;; mode: C++ ***
;;; End: ***
*/