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syschtsa.m
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1999-04-29
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# Copyright (C) 1996 A. Scottedward Hodel
#
# 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, 675 Mass Ave, Cambridge, MA 02139, USA.
function retsys = syschtsa(sys,tsam)
#
# retsys = syschtsa(sys,tsam);
#
# This function changes the sampling time (tsam) of the system.
# Written by John Ingram August 1996
if (nargin != 2)
usage("retsys = syschtsa(sys,tsam)");
elseif (!is_struct(sys))
error("sys must be in system data structure form");
elseif(!is_scal(tsam))
disp("syschtsa:")
tsam
error("tsam must be a scalar")
elseif ( ! (is_sampl(tsam) | (tsam == 0) ) )
error("tsam must be real, scalar, and greater than zero");
elseif (sysgetts(sys) == 0)
[nc,nz,mm,pp] = sysdimen(sys);
warning("syschtsa: continuous system (nc=%d, nz=%d, mm=%d, pp=%d)", ...
nc,nz,mm,pp);
warning("syschtsa: The system is continuous, use c2d to make the system discrete");
endif
retsys = sys;
retsys.tsam = tsam;
endfunction