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diff --git a/octave_packages/general-1.3.1/@inputParser/addOptional.m b/octave_packages/general-1.3.1/@inputParser/addOptional.m
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+++ b/octave_packages/general-1.3.1/@inputParser/addOptional.m
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+## 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} =} addOptional (@var{parser}, @var{argname}, @var{default})
+## @deftypefnx {Function File} {@var{parser} =} @var{parser}.addOptional (@var{argname}, @var{default})
+## @deftypefnx {Function File} {@var{parser} =} addOptional (@var{parser}, @var{argname}, @var{default}, @var{validator})
+## @deftypefnx {Function File} {@var{parser} =} @var{parser}.addOptional (@var{argname}, @var{default}, @var{validator})
+## Add new optional argument to the object @var{parser} of the class inputParser
+## to implement 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{addOptional}, represents the
+## expected order of arguments.
+##
+## @var{default} will be the value used when the argument is not specified.
+##
+## @var{validator} is an optional anonymous function 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}: if a string argument does not validate, it will be considered a
+## ParamValue key. If an optional argument is not given a validator, anything
+## will be valid, and so any string will be considered will be the value of the
+## optional argument (in @sc{matlab}, if no validator is given and argument is
+## a string it will also be considered a ParamValue key).
+##
+## @seealso{inputParser, @@inputParser/addParamValue, @@inputParser/addSwitch,
+## @@inputParser/addParamValue, @@inputParser/addRequired, @@inputParser/parse}
+## @end deftypefn
+
+function inPar = addOptional (inPar, name, def, val)
+
+  ## check @inputParser/subsref for the actual code
+  if (nargin == 3)
+    inPar = subsref (inPar, substruct(
+                                      '.' , 'addOptional',
+                                      '()', {name, def}
+                                      ));
+  elseif (nargin == 4)
+    inPar = subsref (inPar, substruct(
+                                      '.' , 'addOptional',
+                                      '()', {name, def, val}
+                                      ));
+  else
+    print_usage;
+  endif
+
+endfunction