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Evolution and Optimum Seeking

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Numerical Comparison of Strategies 189<br />

Table 6.4 (continued)<br />

POWE{Powell's method of conjugate directions<br />

Number of Number of Number of line Number of objec- Computation time<br />

variables iterations searches tive function calls in seconds<br />

70<br />

80<br />

90<br />

100<br />

(max) 135<br />

3 3 11 27 0.08<br />

6 5 35 77 0.30<br />

10 9 99 215 0.97<br />

20 17 354 744 4.82<br />

30 53 1621 3401 24.1<br />

40 search becomes in nite { no convergence<br />

50 175 8864 21532 235<br />

60 138 8367 19677 222<br />

9<br />

>=<br />

><br />

search becomes in nite { no convergence<br />

DFPS{Stewart's modi cation of the Davidon-Fletcher-Powell method<br />

Number of Number of Number of objec- Computation time Fatal errors<br />

variables iterations tive function calls in seconds<br />

3 3 20 0.04<br />

6 4 41 0.14<br />

10 5 74 0.34<br />

20 7 178 1.36<br />

30 9 333 3.63<br />

60 13 926 19.7<br />

100 17 2003 67.9<br />

135 20 3190 145<br />

(max) 180 22 4757 270 2 oating<br />

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