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} full (@var{KP})
18 ## Return the full matrix representation of the Kronecker product @var{KP}.
20 ## If @var{KP} is the Kronecker product of an @var{n}-by-@var{m} matrix and a
21 ## @var{q}-by-@var{r} matrix, then the result is a @var{n}@var{q}-by-@var{m}@var{r}
22 ## matrix. Thus, the result can require vast amount of memory, so this function
23 ## should be avoided whenever possible.
24 ## @seealso{full, @@kronprod/sparse}
27 function retval = full (KP)
32 if (!isa (KP, "kronprod"))
33 error ("full: input argument must be of class 'kronprod'");
36 retval = full (kron (KP.A, KP.B));
38 #retval = KP.P * retval * KP.P';
39 retval = retval (KP.P, KP.P);