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Evolution and Optimum Seeking

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328 Appendix A<br />

Minimum:<br />

x =(3 0:5) F (x )=0<br />

Besides the strong minimum x there is a weak minimum at in nity:<br />

Saddle point:<br />

Start:<br />

x 0 ! (;1 1) F (x 0 ) ! 0<br />

x 00 =(0 1) F (x 00 ) ' 14:20<br />

x (0) =(0 0) F (x (0) ) ' 14:20<br />

For very large initial step lengths the (1+1) evolution strategy converged once to the weak<br />

minimum x 0 .<br />

Problem 2.2<br />

As Problem 2.1, but with:<br />

Start:<br />

Problem 2.3<br />

Objective function:<br />

x (0) =(0:1 0:1) F (x (0) ) ' 12:99<br />

q<br />

F (x) =;jx sin( jxj)j<br />

Figure A.2: Diagram F (x) for Problem 2.3

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