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diff --git a/octave_packages/general-1.3.1/@inputParser/addRequired.m b/octave_packages/general-1.3.1/@inputParser/addRequired.m
new file mode 100644
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+++ b/octave_packages/general-1.3.1/@inputParser/addRequired.m
@@ -0,0 +1,60 @@
+## Copyright (C) 2011 Carnë Draug <carandraug+dev@gmail.com>
+##
+## 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} {@var{parser} =} addRequired (@var{parser}, @var{argname})
+## @deftypefnx {Function File} {@var{parser} =} @var{parser}.addRequired (@var{argname})
+## @deftypefnx {Function File} {@var{parser} =} addRequired (@var{parser}, @var{argname}, @var{validator})
+## @deftypefnx {Function File} {@var{parser} =} @var{parser}.addRequired (@var{argname}, @var{validator})
+## Add new mandatory argument to the object @var{parser} of inputParser class.
+##
+## This method belongs to the inputParser class and implements an ordered
+## arguments type of API.
+##
+## @var{argname} must be a string with the name of the new argument. The order
+## in which new arguments are added with @command{addrequired}, represents the
+## expected order of arguments.
+##
+## @var{validator} is an optional function handle to validate the given values
+## for the argument with name @var{argname}. Alternatively, a function name
+## can be used.
+##
+## See @command{help inputParser} for examples.
+##
+## @emph{Note}: this can be used together with the other type of arguments but
+## it must be the first (see @command{@@inputParser}).
+##
+## @seealso{inputParser, @@inputParser/addOptional, @@inputParser/addParamValue
+## @@inputParser/addParamValue, @@inputParser/addSwitch, @@inputParser/parse}
+## @end deftypefn
+
+function inPar = addRequired (inPar, name, val)
+
+  ## check @inputParser/subsref for the actual code
+  if (nargin == 2)
+    inPar = subsref (inPar, substruct(
+                                      '.' , 'addRequired',
+                                      '()', {name}
+                                      ));
+  elseif (nargin == 3)
+    inPar = subsref (inPar, substruct(
+                                      '.' , 'addRequired',
+                                      '()', {name, val}
+                                      ));
+  else
+    print_usage;
+  endif
+
+endfunction