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- # Copyright (C) 1993, 1994, 1995 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, 675 Mass Ave, Cambridge, MA 02139, USA.
-
- function gramian = dgram (A, B)
-
- # 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.
-
- # Written by R. Bruce Tenison (btenison@eng.auburn.edu)
- # October 1993
-
- [U, Sig, V] = svd (B);
-
- gramian = U * dlyap (U'*A*U, Sig*Sig') * U';
-
- endfunction
-