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## Copyright (C) 1996 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.
## Usage: x = kron (a, b)
##
## Form the Kronecker product of two matrices, defined block by block
## as
##
## x = [a(i,j) b]
## 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);
## Do 1st column.
x = a (1, 1) * b;
for ii = 2:ma
tmp = a (ii, 1) * b;
x = [x; tmp];
endfor
## Do remaining columns.
for jj = 2:na
tmp = a (1, jj) * b;
for ii = 2:ma
pmt = a (ii, jj) * b;
tmp = [tmp; pmt];
endfor
x = [x, tmp];
endfor
else
usage ("kron (a, b)");
endif
endfunction
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