Mercurial > hg > octave-nkf
view scripts/control/system/syschtsam.m @ 6773:b6e2ab6a8421
[project @ 2007-07-10 12:41:35 by dbateman]
author | dbateman |
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date | Tue, 10 Jul 2007 12:41:35 +0000 |
parents | 34f96dd5441b |
children | 93c65f2a5668 |
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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, Inc., 51 Franklin Street, Fifth Floor, Boston, MA ## 02110-1301 USA. ## -*- 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