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+## Copyright (C) 2008, 2009, 2010 Luca Favatella <slackydeb@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 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, see <http://www.gnu.org/licenses/>.
+
+## -*- texinfo -*-
+## @deftypefn{Function File} {@var{options} =} gaoptimset
+## @deftypefnx{Function File} {@var{options} =} gaoptimset ('@var{param1}', @var{value1}, '@var{param2}', @var{value2}, @dots{})
+## Create genetic algorithm options structure.
+##
+## @strong{Inputs}
+## @table @var
+## @item param
+## Parameter to set. Unspecified parameters are set to their default
+## values; specifying no parameters is allowed.
+## @item value
+## Value of @var{param}.
+## @end table
+##
+## @strong{Outputs}
+## @table @var
+## @item options
+## Structure containing the options, or parameters, for the genetic algorithm.
+## @end table
+##
+## @strong{Options}
+## @table @code
+## @item CreationFcn
+## @item CrossoverFcn
+## @item CrossoverFraction
+## @item EliteCount
+## @item FitnessLimit
+## @item FitnessScalingFcn
+## @item Generations
+## @item InitialPopulation
+##       Can be partial.
+## @item InitialScores
+##       column vector | [] (default) . Can be partial.
+## @item MutationFcn
+## @item PopInitRange
+## @item PopulationSize
+## @item SelectionFcn
+## @item TimeLimit
+## @item UseParallel
+##       "always" | "never" (default) . Parallel evaluation of objective function. TODO: parallel evaluation of nonlinear constraints
+## @item Vectorized
+##       "on" | "off" (default) . Vectorized evaluation of objective function. TODO: vectorized evaluation of nonlinear constraints
+## @end table
+##
+## @seealso{ga}
+## @end deftypefn
+
+## Author: Luca Favatella <slackydeb@gmail.com>
+## Version: 4.4.7
+
+function options = gaoptimset (varargin)
+  if ((nargout != 1) ||
+      (mod (length (varargin), 2) == 1))
+    print_usage ();
+  else
+
+    ## initialize the return variable to a structure with all parameters
+    ## set to their default value
+    options = __gaoptimset_default_options__ ();
+
+    ## set custom options
+    for i = 1:2:length (varargin)
+      param = varargin{i};
+      value = varargin{i + 1};
+      if (! isfield (options, param))
+        error ("wrong parameter");
+      else
+        options = setfield (options, param, value);
+      endif
+    endfor
+  endif
+endfunction
+
+
+## number of input arguments
+%!error options = gaoptimset ("odd number of arguments")
+%!error options = gaoptimset ("Generations", 123, "odd number of arguments")
+
+## number of output arguments
+%!error gaoptimset ("Generations", 123)
+%!error [a, b] = gaoptimset ("Generations", 123)
+
+## type of arguments
+# TODO
+%!#error options = gaoptimset ("Vectorized", "bad value") # TODO: fix
+%!#error options = gaoptimset ("UseParallel", "bad value") # TODO: fix
+
+# TODO: structure/add tests below
+
+%!assert (getfield (gaoptimset ("Generations", 123), "Generations"), 123)
+
+%!test
+%! options = gaoptimset ("EliteCount", 1,
+%!                       "FitnessLimit", 1e-7,
+%!                       "Generations", 1000,
+%!                       "PopInitRange", [-5; 5],
+%!                       "PopulationSize", 200);
+%!
+%! ## "CrossoverFraction" is not specified, so gaoptimset should put the default value: testing this too
+%! assert ([(getfield (options, "CrossoverFraction"));
+%!          (getfield (options, "EliteCount"));
+%!          (getfield (options, "FitnessLimit"));
+%!          (getfield (options, "Generations"));
+%!          (getfield (options, "PopInitRange"));
+%!          (getfield (options, "PopulationSize"))],
+%!         [0.8; 1; 1e-7; 1000; [-5; 5]; 200])