--- a +++ b/repmat.m @@ -0,0 +1,54 @@ +## Copyright (C) 2000 Paul Kienzle +## +## 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 2 of the License, 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 program; if not, write to the Free Software +## Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + +## -*- texinfo -*- +## @deftypefn {Function File} {} repmat (@var{A}, @var{m}, @var{n}) +## @deftypefnx {Function File} {} repmat (@var{A}, [@var{m} @var{n}]) +## Form a block matrix of size @var{m} by @var{n}, with a copy of matrix +## @var{A} as each element. If @var{n} is not specified, form an +## @var{m} by @var{m} block matrix. +## @end deftypefn + +## Author: Paul Kienzle <pkienzle@kienzle.powernet.co.uk> +## Created: July 2000 + +## 2001-06-27 Paul Kienzle <pkienzle@users.sf.net> +## * cleaner, slightly faster code + +function x = repmat (b, m, n) + if (nargin < 2 || nargin > 3) + usage ("repmat (a, m, n)"); + endif + + if nargin == 2 + if is_scalar (m) + n = m; + elseif (is_vector (m) && length (m) == 2) + n = m (2); + m = m (1); + else + error ("repmat: only builds 2D matrices") + endif + endif + + [rb, cb] = size (b); + if (isempty (b)) + x = zeros (m*rb, n*cb); + else + x = b ([1:rb]' * ones(1,m), [1:cb]' * ones(1,n)); + endif + +endfunction