Mercurial > octave
view scripts/linear-algebra/kron.m @ 3426:f8dde1807dee
[project @ 2000-01-13 08:40:00 by jwe]
author | jwe |
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date | Thu, 13 Jan 2000 08:40:53 +0000 |
parents | f16c2ce14886 |
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## Copyright (C) 1996, 1997 John W. Eaton ## ## This file is part of Octave. ## ## Octave 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 2, or (at your option) ## any later version. ## ## Octave 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 Octave; see the file COPYING. If not, write to the Free ## Software Foundation, 59 Temple Place - Suite 330, Boston, MA ## 02111-1307, USA. ## -*- texinfo -*- ## @deftypefn {Function File} {} kron (@var{a}, @var{b}) ## Form the kronecker product of two matrices, defined block by block as ## ## @example ## x = [a(i, j) b] ## @end example ## ## For example, ## ## @example ## @group ## kron (1:4, ones (3, 1)) ## @result{} 1 2 3 4 ## 1 2 3 4 ## 1 2 3 4 ## @end group ## @end example ## @end deftypefn ## Author: A. S. Hodel <scotte@eng.auburn.edu> ## Created: August 1993 ## Adapted-By: jwe function x = kron (a, b) if (nargin == 2) [m, n] = size (b); [ma, na] = size (a); x = zeros (ma*m, na*n); i_vec = 1:m; j_vec = 1:n; for jj = 1:na for ii = 1:ma x(i_vec+(ii-1)*m,j_vec) = a(ii,jj) * b; endfor j_vec = j_vec + n; endfor else usage ("kron (a, b)"); endif endfunction