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Evolution and Optimum Seeking

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348 Appendix A<br />

Problem 2.32 after Bracken <strong>and</strong> McCormick (1970)<br />

Objective function:<br />

Constraints:<br />

Minimum:<br />

F (x) =;x 2<br />

1 ; x 2<br />

2<br />

Gj(x) =xj 0 for j =1 2<br />

G 3(x) =;x 1 +1 0 G 4(x) =;x 1 ; 4 x 2 +5 0<br />

x =(1 1) F (x )=;2 G 3 <strong>and</strong> G 4 active<br />

Besides this global minimum there is another local one:<br />

Start:<br />

x 0 = 0 5<br />

4<br />

F (x 0 )=; 25<br />

16 G 1 <strong>and</strong> G 4 active<br />

x (0) =(0 0) F (x (0) )=0<br />

All the search methods converged to the global minimum.<br />

Problem 2.33 after Zettl (1970)<br />

As Problems 2.14 <strong>and</strong> 2.15, but with the constraints:<br />

Gj(x) =xj+2 ; 2 0 for j =1 2<br />

Figure A.21: Graphical representation of Problem 2.32<br />

F (x) ==0:04 0:16 0:36 0:64 1:0 1:44 1:96 2:56 3:24 4=

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