File: population.php

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File: population.php
Role: Example script
Content type: text/plain
Description: Example script
Class: PHP Genetic GPS
General Problem Solving using Genetic Algorithms
Author: By
Last change:
Date: 6 years ago
Size: 1,424 bytes
 

Contents

Class file image Download
<?php

class Population extends iPopulation
{
    function
__construct($size = 20, $length, $type, $cmp_function = null)
    {
       
$this->size = $size;
       
$this->length = $length;
       
$this->type = $type;
       
$this->cmp_function = $cmp_function;
    }
   
    public function
makePopulation()
    {
       
$length = $this->length;
       
$type = $this->type;
       
        for(
$i = 0; $i < $this->size; $i++)
        {
           
$this->add(new Genome([ 'length' => $length, 'type' => $type ]));
           
$this->members[$i]->initialize();
        }
       
$this->calcTotal();
    }
    public function
add($genome)
    {
       
$this->members[] = $genome;
    }
    public function
sort()
    {
       
usort($this->members, $this->cmp_function);
    }
    public function
delete($index, $flag = true)
    {
        unset(
$this->members[$index]);
        if(
$flag )
           
array_values($this->members);
    }
    public function
reset()
    {
       
$this->totalFitness = 0;
    }
    public function
calcTotal()
    {
       
$sum = 0;

        for(
$i = 0; $i < $this->size; $i++)
           
$sum += $this->members[$i]->fitness;

       
$this->totalFitness = floatval($sum);
    }
    public function
totalFitness()
    {
        return
$this->totalFitness;
    }
    public function
best($num = 1)
    {
       
$this->sort();
        return
array_slice($this->members, 0, $num);
    }
    public function
worst($num = 0)
    {
       
$this->sort();
        return
array_slice($this->members, $size - $num, $size);
    }
    public function
clear()
    {
       
$this->reset();
        for(
$i = 0; $i < $this->size; $i++)
           
$this->delete($i);
       
$this->members = [];
    }
}


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