Last change
on this file since 7611 was
6152,
checked in by bfarka, 13 years ago
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added ecj and custom statistics to communicate with the okb services #1441
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File size:
2.0 KB
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1 | /* |
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2 | Copyright 2006 by Sean Luke and George Mason University |
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3 | Licensed under the Academic Free License version 3.0 |
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4 | See the file "LICENSE" for more information |
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5 | */ |
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6 | |
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7 | |
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8 | package ec.select; |
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9 | import ec.*; |
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10 | import ec.util.*; |
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11 | import ec.steadystate.*; |
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12 | |
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13 | /* |
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14 | * RandomSelection.java |
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15 | * |
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16 | * Created: Tue Sep 3 2002 |
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17 | * By: Liviu Panait |
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18 | */ |
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19 | |
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20 | /** |
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21 | * Picks a random individual in the subpopulation. This is mostly |
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22 | * for testing purposes. |
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23 | * |
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24 | |
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25 | <p><b>Default Base</b><br> |
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26 | select.random |
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27 | |
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28 | * |
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29 | * @author Sean Luke |
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30 | * @version 1.0 |
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31 | */ |
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32 | |
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33 | public class RandomSelection extends SelectionMethod implements SteadyStateBSourceForm |
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34 | { |
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35 | /** default base */ |
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36 | public static final String P_RANDOM = "random"; |
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37 | |
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38 | public Parameter defaultBase() |
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39 | { |
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40 | return SelectDefaults.base().push(P_RANDOM); |
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41 | } |
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42 | |
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43 | // I hard-code both produce(...) methods for efficiency's sake |
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44 | |
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45 | public int produce(final int subpopulation, |
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46 | final EvolutionState state, |
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47 | final int thread) |
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48 | { |
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49 | return state.random[thread].nextInt( state.population.subpops[subpopulation].individuals.length ); |
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50 | } |
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51 | |
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52 | // I hard-code both produce(...) methods for efficiency's sake |
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53 | |
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54 | public int produce(final int min, |
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55 | final int max, |
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56 | final int start, |
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57 | final int subpopulation, |
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58 | final Individual[] inds, |
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59 | final EvolutionState state, |
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60 | final int thread) |
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61 | { |
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62 | int n = 1; |
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63 | if (n>max) n = max; |
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64 | if (n<min) n = min; |
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65 | |
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66 | for(int q = 0; q < n; q++) |
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67 | { |
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68 | Individual[] oldinds = state.population.subpops[subpopulation].individuals; |
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69 | inds[start+q] = oldinds[state.random[thread].nextInt( state.population.subpops[subpopulation].individuals.length )]; |
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70 | } |
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71 | return n; |
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72 | } |
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73 | |
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74 | public void individualReplaced(final SteadyStateEvolutionState state, |
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75 | final int subpopulation, |
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76 | final int thread, |
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77 | final int individual) |
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78 | { return; } |
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79 | |
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80 | public void sourcesAreProperForm(final SteadyStateEvolutionState state) |
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81 | { return; } |
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82 | |
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83 | } |
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