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- ## Copyright (C) 1996 Auburn University. All Rights Reserved.
- ##
- ## 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 USA.
-
- ## -*- texinfo -*-
- ## @deftypefn {Function File } { retsys =} syschtsam ( sys,tsam )
- ## This function changes the sampling time (tsam) of the system. Exits with
- ## an error if sys is purely continuous time.
- ## @end deftypefn
-
- function retsys = syschtsam (sys, tsam)
- ## Written by John Ingram August 1996
-
- if (nargin != 2)
- usage("retsys = syschtsam(sys,tsam)");
- elseif (!is_struct(sys))
- error("sys must be in system data structure form");
- elseif(!is_scalar(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
-