138 lines
2.6 KiB
PHP
138 lines
2.6 KiB
PHP
<?php
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declare(strict_types=1);
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namespace Phpml\Clustering\KMeans;
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use IteratorAggregate;
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use Countable;
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use SplObjectStorage;
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use LogicException;
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class Cluster extends Point implements IteratorAggregate, Countable
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{
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/**
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* @var Space
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*/
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protected $space;
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/**
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* @var SplObjectStorage|Point[]
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*/
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protected $points;
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/**
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* @param Space $space
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* @param array $coordinates
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*/
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public function __construct(Space $space, array $coordinates)
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{
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parent::__construct($coordinates);
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$this->space = $space;
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$this->points = new SplObjectStorage();
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}
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/**
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* @return array
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*/
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public function getPoints()
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{
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$points = [];
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foreach ($this->points as $point) {
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$points[] = $point->toArray();
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}
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return $points;
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}
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/**
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* @return array
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*/
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public function toArray()
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{
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return array(
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'centroid' => parent::toArray(),
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'points' => $this->getPoints(),
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);
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}
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/**
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* @param Point $point
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*
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* @return Point
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*/
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public function attach(Point $point)
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{
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if ($point instanceof self) {
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throw new LogicException('cannot attach a cluster to another');
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}
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$this->points->attach($point);
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return $point;
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}
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/**
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* @param Point $point
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*
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* @return Point
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*/
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public function detach(Point $point)
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{
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$this->points->detach($point);
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return $point;
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}
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/**
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* @param SplObjectStorage $points
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*/
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public function attachAll(SplObjectStorage $points)
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{
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$this->points->addAll($points);
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}
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/**
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* @param SplObjectStorage $points
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*/
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public function detachAll(SplObjectStorage $points)
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{
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$this->points->removeAll($points);
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}
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public function updateCentroid()
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{
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if (!$count = count($this->points)) {
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return;
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}
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$centroid = $this->space->newPoint(array_fill(0, $this->dimension, 0));
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foreach ($this->points as $point) {
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for ($n = 0; $n < $this->dimension; ++$n) {
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$centroid->coordinates[$n] += $point->coordinates[$n];
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}
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}
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for ($n = 0; $n < $this->dimension; ++$n) {
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$this->coordinates[$n] = $centroid->coordinates[$n] / $count;
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}
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}
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/**
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* @return Point[]|SplObjectStorage
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*/
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public function getIterator()
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{
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return $this->points;
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}
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/**
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* @return mixed
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*/
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public function count()
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{
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return count($this->points);
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}
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}
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