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Evolution and Optimum Seeking

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Numerical Comparison of Strategies 183<br />

Table 6.3 (continued)<br />

DSCG{Davies-Swann-Campey method with Gram-Schmidt orthogonalization<br />

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

variables orthog. searches tive function calls in seconds<br />

3 0 3 20 0.04<br />

6 0 6 34 0.10<br />

10 0 10 56 0.20<br />

20 0 20 111 0.68<br />

30 0 30 136 1.18<br />

50 0 50 226 2.80<br />

(max) 75 0 75 338 6.10<br />

DSCP{Davies-Swann-Campey method with Palmer orthogonalization<br />

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

variables orthog. searches tive function calls in seconds<br />

(max) 95 0 95 428 9.49<br />

Results for n 75 identical to those of DSCG in addition.<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 />

3 1 3 11 0.02<br />

6 1 6 20 0.06<br />

10 1 10 32 0.12<br />

20 1 20 62 0.32<br />

30 1 30 92 0.60<br />

60 1 60 182 1.96<br />

100 1 100 202 3.72<br />

(max) 135 1 135 407 8.60<br />

1 complete iteration = n + 1 line searches included are all the iterations begun

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