ga_f614a.m

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function PI=GA_f614a(x)
global MIN_offset MUL_factor Emin MDL r_deg Init_P Init_V
global V11 V12 V21 V22 W11 W12 b11 b21 c11 FT Mode K a1 a2
% Fitness function evaluation of Example 6.1-4

% PenChen Chou, 7-29-2001
Init_P=10;
Init_V=0;
K=10;
a1=2;
a2=3;

V11=GA_round4dp(x(1));
V12=GA_round4dp(x(2));
V21=GA_round4dp(x(3));
V22=GA_round4dp(x(4));
b11=GA_round4dp(x(5));
b21=GA_round4dp(x(6));
W11=GA_round4dp(x(7));
W12=GA_round4dp(x(8));
c11=GA_round4dp(x(9));

% Get Y
[t, X, Y]=sim(MDL,[0:0.05:FT]);
error=abs(Y(:,1)); 
ERR=10*sum(error);
PI=ERR;
if MIN_offset>0
   PI=MIN_offset-PI;
   if PI<0, PI=10; end;
end;
if Emin>=ERR
   Emin=ERR; fprintf('\nERR=%f',ERR);
   %save ex614_data V11 V12 V21 V22 W11 W12 b11 b21 c11 ERR
   %pause(2)
else
   fprintf('>'); 
end;