www.pudn.com > PSOtofMatlab.rar > Rastrigin.m, change:2004-08-19,size:521b


% Rastrigin.m 
% Rastrigin function 
% 
% used to test optimization/global minimization problems  
% 
% f(x) = sum([x.^2-10*cos(2*pi*x) + 10], 2); 
%  
% x = N element row vector containing [x0, x1, ..., xN] 
% each row is processed independently, 
% you can feed in matrices of timeXN no prob 
% 
% example: cost = Rastrigin([1,2;5,6;0,-50]) 
% note: known minimum =0 @ all x = 0 
 
% Brian Birge 
% Rev 1.0 
% 9/12/04 
 
function [out]=Rastrigin(in) 
 
 cos_in = cos(2*pi*in); 
 out    = sum((in.^2-10*cos_in + 10), 2);