1 ## Copyright (C) 2010 Soren Hauberg
3 ## This program is free software; you can redistribute it and/or modify
4 ## it under the terms of the GNU General Public License as published by
5 ## the Free Software Foundation; either version 3, or (at your option)
8 ## This program is distributed in the hope that it will be useful, but
9 ## WITHOUT ANY WARRANTY; without even the implied warranty of
10 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 ## General Public License for more details.
13 ## You should have received a copy of the GNU General Public License
14 ## along with this file. If not, see <http://www.gnu.org/licenses/>.
17 ## @deftypefn {Function File} kronprod (@var{A}, @var{B})
18 ## @deftypefnx{Function File} kronprod (@var{A}, @var{B}, @var{P})
19 ## Construct a Kronecker product object.
20 ## XXX: Write proper documentation
22 ## With two input arguments, the following matrix is represented: kron (A, B);
24 ## With three input arguments, the following matrix is represented: P * kron (A, B) * P'
25 ## (P must be a permutation matrix)
29 function retval = kronprod (A, B, P)
31 KP.A = KP.B = KP.P = [];
32 elseif (nargin == 2 && ismatrix (A) && ismatrix (B))
36 elseif (nargin == 3 && ismatrix (A) && ismatrix (B))
37 # && strcmp (typeinfo (P), "permutation matrix"))
38 ## XXX: Check that the size of P is correct
46 retval = class (KP, "kronprod");