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is_siso.m
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1999-03-05
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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 SISO = is_siso(sys)
# function SISO = is_siso(sys)
# return nonzero if the system sys is single-input, single-output.
# a s hodel July 1996, 1998
if(nargin != 1)
usage("SISO = is_siso(sys)");
elseif( !is_struct(sys))
error("input must be a system structure (see ss2sys, tf2sys, zp2sys)");
endif
[n,nz,m,p] = sysdimensions(sys);
SISO = (m == 1 & p == 1);
endfunction