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Table 3
Values of the parameters set in PIKAIA with their meaning in comparison with the standard ones.
| Parameter | Present work | Default | Identifier name |
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| ng | 100 | 100 | number of individuals in a population |
| ngen | 300 | 500 | number of generations over which solution is to evolve |
| nd | 5 | 6 | number of significant digits |
| crossover | 0.90 | 0.85 | crossover probability |
| mut | 2 | 2 | mutation mode: 1 – one-point mutation, fixed rate; 2 – one-point, adjustable rate based on fitness; |
| 3 – one-point, adjustable rate based on distance; 4 – one-point + creep, fixed rate; | |||
| 5 – one-point+creep, adjustable rate based on fitness; | |||
| 6 – one-point+creep, adjustable rate based on distance | |||
| imut | 0.005 | 0.005 | initial mutation rate |
| pmutmn | 0.0005 | 0.0005 | minimum mutation rate |
| pmutmx | 0.35 | 0.25 | maximum mutation rate |
| fdif | 1.0 | 1.0 | relative fitness differential |
| irep | 1 | 3 | reproduction plan: 1 – full generational; 2 – steady state replace-random; |
| 3 – state-replace-worst (only with no elitism) | |||
| ielite | 1 | 0 | elitism: 1 = on, 0 = off |
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