File: gaExample1.php

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File: gaExample1.php
Role: Example script
Content type: text/plain
Description: GA Example 1
Class: GA
Generic genetic algorithms base implementation
Author: By
Last change:
Date: 15 years ago
Size: 1,107 bytes
 

Contents

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<?
require_once('ga.php');
class
Test {
    var
$p1;
    var
$p2;
   
    function
Test($p1=0,$p2=0) {
       
$this->p1 = $p1;
       
$this->p2 = $p2;
    }
}

function
debug($x) {
    echo
"<pre style='border: 1px solid black'>";
   
print_r($x);
    echo
'</pre>';
}

//This will be the mutation function. Just increments the property.
function inc($x) {
    return
$x+1;
}
//This will be the fitness function. Is just the sum of all properties.
function total($obj) {
    return
$obj->p1 + $obj->p2;
}

$t1 = new Test(1,4);
$t2 = new Test(3,2);
$ga = new GA();
$ga->population = array($t1,$t2);
$ga->fitness_function = 'total'; //Uses the 'total' function as fitness function
$ga->num_couples = 1; //1 couple per generation
$ga->death_rate = 0; //1 death per generation
$ga->generations = 10; //Executes 10 generations
$ga->crossover_functions = 'max'; //Uses the 'max' (built-in) function as crossover function
$ga->mutation_function = 'inc'; //Uses the 'inc' function as mutation function
$ga->mutation_rate = 1; //1% mutation rate
$ga->evolve(); //Run
debug($ga->population);
?>


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