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Use kron since it is faster than constructing index vectors.
author | pkienzle |
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date | Mon, 29 Apr 2002 17:10:18 +0000 |
parents | 6b33357c7561 |
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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 ## 2002-04-29 Paul Kienzle <pkienzle@users.sf.net> ## * user builtin kron which is faster 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 if (isstr(b)) x = setstr(kron(ones(m,n),toascii(b))); else x = kron(ones(m,n),b); endif endfunction