diff main/general/repmat.m @ 0:6b33357c7561 octave-forge

Initial revision
author pkienzle
date Wed, 10 Oct 2001 19:54:49 +0000
parents
children acd3dcc6194b
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main/general/repmat.m	Wed Oct 10 19:54:49 2001 +0000
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+## 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