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comparison scripts/control/gram.m @ 3213:ba1c7cdc6090

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[project @ 1998-11-06 16:15:36 by jwe]
author jwe
date Fri, 06 Nov 1998 16:16:31 +0000
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3212:bf61c443a366 3213:ba1c7cdc6090
1 # Copyright (C) 1996 A. Scottedward Hodel
2 #
3 # This file is part of Octave.
4 #
5 # Octave is free software; you can redistribute it and/or modify it
6 # under the terms of the GNU General Public License as published by the
7 # Free Software Foundation; either version 2, or (at your option) any
8 # later version.
9 #
10 # Octave is distributed in the hope that it will be useful, but WITHOUT
11 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 # FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 # for more details.
14 #
15 # You should have received a copy of the GNU General Public License
16 # along with Octave; see the file COPYING. If not, write to the Free
17 # Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
18
19 function m = gram(a,b)
20 # m = gram(a,b)
21 # Return controllability grammian of continuous time system
22 #
23 # dx/dt = a x + b u
24 #
25 # a m + a' + b*b' = 0
26
27 # Written by A. S. Hodel
28 # $Revision: 1.2 $
29
30 # let lyap do the error checking...
31 m = lyap(a,b*b');
32 endfunction