Add a useful package (from Source forge) for octave

[CreaPhase.git] / octave_packages / ga-0.10.0 / rastriginsfcn.m

diff --git a/octave_packages/ga-0.10.0/rastriginsfcn.m b/octave_packages/ga-0.10.0/rastriginsfcn.m
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+## Copyright (C) 2008, 2009, 2010, 2012 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{y} =} rastriginsfcn (@var{x})
+## Rastrigin's function.
+## @end deftypefn
+
+## Author: Luca Favatella <slackydeb@gmail.com>
+## Version: 2.0
+
+function retval = rastriginsfcn (x)
+  if ((nargout != 1) ||
+      (nargin != 1) || (columns (x) != 2))
+    print_usage ();
+  else
+    x1 = x(:, 1);
+    x2 = x(:, 2);
+    retval = 20 + (x1 .** 2) + (x2 .** 2) - 10 .* (cos (2 .* pi .* x1) +
+                                                   cos (2 .* pi .* x2));
+  endif
+endfunction
+
+
+## number of input arguments
+%!error y = rastriginsfcn ()
+%!error y = rastriginsfcn ([0, 0], "other argument")
+
+## number of output arguments
+%!error [y1, y2] = rastriginsfcn ([0, 0])
+
+## type of arguments
+%!error y = rastriginsfcn ([0; 0])
+%!error y = rastriginsfcn (zeros (2, 3)) # TODO: document size of x
+
+%!assert (rastriginsfcn ([0, 0]), 0)
+%!assert (rastriginsfcn ([0, 0; 0, 0]), [0; 0])
+%!assert (rastriginsfcn (zeros (3, 2)), [0; 0; 0])