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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, 59 Temple Place, Suite 330, Boston, MA 02111 USA.
-
- ## -*- texinfo -*-
- ## @deftypefn {Function File } { @var{m} =} dgram ( @var{a}, @var{b})
- ## Return controllability grammian of discrete time system
- ## @example
- ## x(k+1) = a x(k) + b u(k)
- ## @end example
- ##
- ## @strong{Inputs}
- ## @table @var
- ## @item a
- ## @var{n} by @var{n} matrix
- ## @item b
- ## @var{n} by @var{m} matrix
- ## @end table
- ##
- ## @strong{Outputs}
- ## @var{m} (@var{n} by @var{n}) satisfies
- ## @example
- ## a m a' - m + b*b' = 0
- ## @end example
- ##
- ## @end deftypefn
-
- function m = dgram (a, b)
-
- ## Written by A. S. Hodel July 1995
-
- ## let dlyap do the error checking...
- m = dlyap(a,b*b');
- endfunction
-