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Evolution and Optimum Seeking

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354 Appendix A<br />

Start:<br />

x (0) =(250 250 250 250 250) F (x (0) )=;1250<br />

In terms of the values of the variables, none of the strategies tested achieved accuracies<br />

better than 10 ;2 . The two variants of the (10 , 100) evolution strategy came closest to<br />

the exact solution.<br />

Problem 2.41<br />

Objective function:<br />

Constraints:<br />

Minimum:<br />

Start:<br />

F (x) =;<br />

x = 0 0 0 0 50000<br />

14<br />

5X<br />

i=1<br />

(ixi)<br />

as for Problem 2.40<br />

F (x )= ;250000<br />

14<br />

Gj active forj =1 2 3 4 6<br />

x (0) =(250 250 250 250 250) F (x (0) )=;3750<br />

This problem di ers from the previous one only in the numerical values regarding the<br />

accuracies achieved, the same remarks apply as for Problem 2.40.<br />

Figure A.25: Graphical representation of Problem 2.41 on the plane<br />

x2 = x3 = x4 =0<br />

F (x) == ; 30000 ;25000 ;20000<br />

;15000 ;10000 ;5000 0=

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