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- ## Copyright (C) 1996 John W. Eaton
- ##
- ## 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
- ## 02111-1307, USA.
-
- ## Usage: gramian = dgram (A, B)
- ##
- ## Returns the discrete controllability and observability gramian.
- ##
- ## dgram (A, B) returns the discrete controllability gramian.
- ## dgram (A', C') returns the observability gramian.
-
- ## Author: R. Bruce Tenison <btenison@eng.auburn.edu>
- ## Created: October 1993
- ## Adapted-By: jwe
-
-
- function gramian = dgram (A, B)
-
- [U, Sig, V] = svd (B);
-
- gramian = U * dlyap (U'*A*U, Sig*Sig') * U';
-
- endfunction
-