www.pudn.com > PSOtofMatlab.rar > NDparabola.m, change:2004-08-19,size:663b


% NDparabola.m 
% ND Parabola function (also called a Sphere function and DeJong's f1), 
% described by Clerc... 
% http://clerc.maurice.free.fr/pso/Semi-continuous_challenge/Semi-continuous_challenge.htm 
% 
% used to test optimization/global minimization problems  
% in Clerc's "Semi-continuous challenge" 
% 
% f(x) = sum( x.^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 = NDparabola([1,2;5,6;0,-50]) 
% note: known minimum =0 @ all x = 0 
 
% Brian Birge 
% Rev 1.0 
% 9/12/04 
 
function [out]=NDparabola(in) 
 out = sum(in.^2, 2);