www.pudn.com > WebsiteCode.zip > rastrigin.m, change:2009-09-08,size:1129b

function f = rastrigin(x) % f = rastrigin(x) % % This function takes a input vector x and % returns a scalar output of the Rastrigin function: % a difficult search problem used to test GA % Global optimum is 0 at x = [0 0 .... 0] % % Inputs: % x - vector of any length in range {-5.12 5.12} % % Outputs: % f -scalar Rastrigin funtion value % % % Copyright 2009 A Sobester % % This program is free software: you can redistribute it and/or modify it % under the terms of the GNU Lesser General Public License as published by % the Free Software Foundation, either version 3 of the License, or 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 Lesser % General Public License for more details. % % You should have received a copy of the GNU General Public License and GNU % Lesser General Public License along with this program. If not, see % <http://www.gnu.org/licenses/>. f =10*length(x)+sum(x.^2-10*cos(2*pi*x));