1 ## Copyright (C) 2009 Lukas F. Reichlin
3 ## This file is part of LTI Syncope.
5 ## LTI Syncope is free software: you can redistribute it and/or modify
6 ## it under the terms of the GNU General Public License as published by
7 ## the Free Software Foundation, either version 3 of the License, or
8 ## (at your option) any later version.
10 ## LTI Syncope is distributed in the hope that it will be useful,
11 ## but WITHOUT ANY WARRANTY; without even the implied warranty of
12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 ## GNU General Public License for more details.
15 ## You should have received a copy of the GNU General Public License
16 ## along with LTI Syncope. If not, see <http://www.gnu.org/licenses/>.
19 ## Matrix power of LTI objects. The exponent must be an integer.
20 ## Used by Octave for "sys^int".
22 ## Author: Lukas Reichlin <lukas.reichlin@gmail.com>
23 ## Created: October 2009
26 function retsys = mpower (sys, e)
28 if (nargin != 2) # prevent sys = mpower (a, b, c, ...)
29 error ("lti: mpower: this is a binary operator");
32 if (! is_real_scalar (e) || e != round (e))
33 error ("lti: mpower: exponent must be an integer");
39 error ("lti: mpower: system must be square");
42 ex = round (abs (e)); # make sure ex is a positive integer
56 retsys = retsys * sys;