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} rank (@var{KP})
18 ## Return the rank of the Kronecker product @var{KP}. This is computed as the
19 ## product of the ranks of the matrices forming the product.
20 ## @seealso{rank, @@kronprod/det, @@kronprod/trace}
23 function retval = rank (KP)
28 if (!isa (KP, "kronprod"))
29 error ("rank: input must be of class 'kronprod'");
32 retval = rank (KP.A) * rank (KP.B);