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diff --git a/octave_packages/general-1.3.1/@dict/join.m b/octave_packages/general-1.3.1/@dict/join.m
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+## Copyright (C) 2009 VZLU Prague, a.s., Czech Republic
+##
+## 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 3 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, see <http://www.gnu.org/licenses/>.
+
+## -*- texinfo -*-
+## @deftypefn{Function File} {} join (d1, d2, joinop)
+## Merges two given dictionaries. For common keys, the function @var{joinop} is
+## called to combine the two values. If not supplied, values from d2 are taken.
+## @end deftypefn
+
+## Author: Jaroslav Hajek <highegg@gmail.com>
+
+function d = join (d1, d2, jop)
+  if (nargin < 2 || nargin > 3 || ! (isa (d1, "dict") && isa (d2, "dict")))
+    print_usage ();
+  endif
+
+  keys1 = d1.keys;
+  keys2 = d2.keys;
+
+  [keys, idx] = sort ([keys1; keys2]);
+  values = [d1.values; d2.values](idx);
+  n = numel (keys);
+
+  if (n > 1)
+    idx = find (strcmp (keys(1:n-1), keys(2:n)));
+    keys(idx) = [];
+    if (nargin == 3)
+      values(idx+1) = cellfun (jop, values(idx), values(idx+1), "UniformOutput", false);
+    endif
+    values(idx) = [];
+  endif
+
+  d = dict;
+  d.keys = keys;
+  d.values = values;
+
+endfunction
+