## Copyright (C) 1997 Kai P. Mueller
##
## 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 } { @var{outsys} =} ugain(n)
##  Creates a system with unity gain, no states.
##  This trivial system is sometimes needed to create arbitrary
##  complex systems from simple systems with buildssic.
##  Watch out if you are forming sampled systems since "ugain"
##  does not contain a sampling period.  
## @end deftypefn
## @seealso{hinfdemo (MIMO H_infinty example, Boeing 707-321 aircraft model)}

## Author: Kai P. Mueller <mueller@ifr.ing.tu-bs.de>
## Created: April 1998

function outsys = ugain (n)

  if((nargin != 1) || (nargout > 1))
    usage("outsys = ugain(n)")
  endif
  outsys = ss2sys([],[],[],eye(n));

endfunction