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diff --git a/octave_packages/m/strings/dec2bin.m b/octave_packages/m/strings/dec2bin.m
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+## Copyright (C) 1996-2012 Daniel Calvelo
+##
+## 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 3 of the License, 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, see
+## <http://www.gnu.org/licenses/>.
+
+## -*- texinfo -*-
+## @deftypefn {Function File} {} dec2bin (@var{d}, @var{len})
+## Return a binary number corresponding to the non-negative integer
+## @var{d}, as a string of ones and zeros.  For example:
+##
+## @example
+## @group
+## dec2bin (14)
+##      @result{} "1110"
+## @end group
+## @end example
+##
+## If @var{d} is a matrix or cell array, return a string matrix with one
+## row per element in @var{d}, padded with leading zeros to the width of 
+## the largest value.
+##
+## The optional second argument, @var{len}, specifies the minimum
+## number of digits in the result.
+## @seealso{bin2dec, dec2base, dec2hex}
+## @end deftypefn
+
+## Author: Daniel Calvelo <dcalvelo@yahoo.com>
+## Adapted-by: Paul Kienzle <pkienzle@kienzle.powernet.co.uk>
+
+function b = dec2bin (d, len)
+
+  if (nargin == 1)
+    b = dec2base (d, 2);
+  elseif (nargin == 2)
+    b = dec2base (d, 2, len);
+  else
+    print_usage ();
+  endif
+
+endfunction
+
+
+%!assert(dec2bin (14), "1110");
+%!assert(dec2bin (14, 6), "001110");
+%!assert(dec2bin ({1, 2; 3, 4}), ["001"; "011"; "010"; "100"]);
+
+%%Test input validation
+%!error dec2bin ();
+%!error dec2bin (1, 2, 3);
+