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## Copyright (C) 1998, 2000, 2002, 2003, 2004, 2005, 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} {} sysgettype (@var{sys})
## return the initial system type of the system
##
## @strong{Input}
## @table @var
## @item sys
## System data structure.
## @end table
##
## @strong{Output}
## @table @var
## @item systype
## String indicating how the structure was initially
## constructed. Values: @code{"ss"}, @code{"zp"}, or @code{"tf"}.
## @end table
##
## @acronym{FIR} initialized systems return @code{systype="tf"}.
## @end deftypefn
function systype = sysgettype (sys)
if (nargin != 1)
print_usage ();
endif
if (! isstruct (sys))
error ("sysgettype: input sys is not a structure");
endif
typestr = {"tf", "zp", "ss"};
systype = typestr{sys.sys(1) + 1};
endfunction
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