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dgram.m
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1999-03-05
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# Copyright (C) 1996 A. Scottedward Hodel
#
# 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 m = dgram(a,b)
# m = dgram(a,b)
# Return controllability grammian of discrete time system
#
# x(k+1) = a x(k) + b u(k)
#
# a m a' - m + b*b' = 0
# Written by A. S. Hodel July 1995
# let dlyap do the error checking...
m = dlyap(a,b*b');
endfunction