X-Git-Url: https://git.creatis.insa-lyon.fr/pubgit/?p=CreaPhase.git;a=blobdiff_plain;f=octave_packages%2Flinear-algebra-2.2.0%2F%40kronprod%2Frank.m;fp=octave_packages%2Flinear-algebra-2.2.0%2F%40kronprod%2Frank.m;h=2744f3839a4e591b53f49c81a9de16b495530dcb;hp=0000000000000000000000000000000000000000;hb=f5f7a74bd8a4900f0b797da6783be80e11a68d86;hpb=1705066eceaaea976f010f669ce8e972f3734b05

diff --git a/octave_packages/linear-algebra-2.2.0/@kronprod/rank.m b/octave_packages/linear-algebra-2.2.0/@kronprod/rank.m
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+++ b/octave_packages/linear-algebra-2.2.0/@kronprod/rank.m
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+## Copyright (C) 2010  Soren Hauberg
+## 
+## This program is free software; you can redistribute it and/or modify
+## it under the terms of the GNU General Public License as published by
+## the Free Software Foundation; either version 3, or (at your option)
+## any later version.
+## 
+## This program is distributed in the hope that it will be useful, but
+## WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+## General Public License for more details. 
+## 
+## You should have received a copy of the GNU General Public License
+## along with this file.  If not, see <http://www.gnu.org/licenses/>.
+
+## -*- texinfo -*-
+## @deftypefn {Function File} rank (@var{KP})
+## Return the rank of the Kronecker product @var{KP}. This is computed as the
+## product of the ranks of the matrices forming the product.
+## @seealso{rank, @@kronprod/det, @@kronprod/trace}
+## @end deftypefn
+
+function retval = rank (KP)
+  if (nargin != 1)
+    print_usage ();
+  endif
+  
+  if (!isa (KP, "kronprod"))
+    error ("rank: input must be of class 'kronprod'");
+  endif
+  
+  retval = rank (KP.A) * rank (KP.B);
+endfunction