ga_fextra1.m

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function PI=GA_fextra1(chro)
% Fitness function evaluation
% chro is the array transfered from GA for optimization.

% PenChen Chou, 2003-11-12

global MIN_offset MUL_factor

% Set MIN_offset=25 for this problem if not defined and
% You solve for a minimization problem.
if exist('MIN_offset','var'), 
    if isempty(MIN_offset), MIN_offset=25; end
end
% Always to set MAX_factor=1, if you have no idea about
% the meaning of MAX_factor at the first time.
if exist('MUL_factor','var'), 
    if isempty(MUL_factor), MUL_factor=1; end
end

% Fitness function evaluation
x=chro(1); y=chro(2);
PI=x*x*(4-2.1*x*x+x^4/3)+x*y+y*y*(-4+4*y*y);

% attached_part is used to transfer a minimization problem
% into a maximization problem. Input is PI, Output is PI.
attached_part;