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## Copyright (C) 1996, 2000, 2002, 2003, 2005, 2006, 2007
## Auburn University. All rights reserved.
##
##
## This program 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 3 of the License, or (at
## your option) any later version.
##
## This program 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 this program; see the file COPYING. If not, see
## <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn {Function File} {} syschtsam (@var{sys}, @var{tsam})
## This function changes the sampling time (tsam) of the system. Exits with
## an error if sys is purely continuous time.
## @end deftypefn
## Author: John Ingram <ingraje@eng.auburn.edu>
## Created: August 1996
function retsys = syschtsam (sys, tsam)
if (nargin != 2)
print_usage ();
elseif (! isstruct (sys))
error ("sys must be in system data structure form");
elseif (! isscalar (tsam))
disp ("syschtsam:")
tsam
error ("tsam must be a scalar")
elseif (! (is_sample (tsam) || tsam <= 0))
error ("tsam must be real, scalar, and greater than zero");
elseif (sysgettsam (sys) == 0)
[nc, nz, mm, pp] = sysdimensions (sys);
warning ("syschtsam: continuous system (nc=%d, nz=%d, mm=%d, pp=%d)",
nc, nz, mm, pp);
warning ("syschtsam: The system is continuous, use c2d to make the system discrete");
endif
retsys = sys;
retsys.tsam = tsam;
endfunction
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