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syl.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.
*/
// Written by A. S. Hodel <scotte@eng.auburn.edu>
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "defun-dld.h"
#include "error.h"
#include "gripes.h"
#include "help.h"
#include "oct-obj.h"
#include "utils.h"
DEFUN_DLD (syl, args, nargout,
"X = syl (A, B, C): solve the Sylvester equation A X + X B + C = 0")
{
octave_value_list retval;
int nargin = args.length ();
if (nargin != 3 || nargout > 1)
{
print_usage ("syl");
return retval;
}
octave_value arg_a = args(0);
octave_value arg_b = args(1);
octave_value arg_c = args(2);
int a_nr = arg_a.rows ();
int a_nc = arg_a.columns ();
int b_nr = arg_b.rows ();
int b_nc = arg_b.columns ();
int c_nr = arg_c.rows ();
int c_nc = arg_c.columns ();
int arg_a_is_empty = empty_arg ("syl", a_nr, a_nc);
int arg_b_is_empty = empty_arg ("syl", b_nr, b_nc);
int arg_c_is_empty = empty_arg ("syl", c_nr, c_nc);
if (arg_a_is_empty > 0 && arg_b_is_empty > 0 && arg_c_is_empty > 0)
return Matrix ();
else if (arg_a_is_empty || arg_b_is_empty || arg_c_is_empty)
return retval;
// Arguments are not empty, so check for correct dimensions.
if (a_nr != a_nc || b_nr != b_nc)
{
gripe_square_matrix_required ("syl: first two parameters:");
return retval;
}
else if (a_nr != c_nr || b_nr != c_nc)
{
gripe_nonconformant ();
return retval;
}
// Dimensions look o.k., let's solve the problem.
if (arg_a.is_complex_type ()
|| arg_b.is_complex_type ()
|| arg_c.is_complex_type ())
{
// Do everything in complex arithmetic;
ComplexMatrix ca = arg_a.complex_matrix_value ();
if (error_state)
return retval;
ComplexMatrix cb = arg_b.complex_matrix_value ();
if (error_state)
return retval;
ComplexMatrix cc = arg_c.complex_matrix_value ();
if (error_state)
return retval;
retval = Sylvester (ca, cb, cc);
}
else
{
// Do everything in real arithmetic.
Matrix ca = arg_a.matrix_value ();
if (error_state)
return retval;
Matrix cb = arg_b.matrix_value ();
if (error_state)
return retval;
Matrix cc = arg_c.matrix_value ();
if (error_state)
return retval;
retval = Sylvester (ca, cb, cc);
}
return retval;
}
/*
;;; Local Variables: ***
;;; mode: C++ ***
;;; End: ***
*/