126 lines
2.4 KiB
PHP
126 lines
2.4 KiB
PHP
<?php
|
|
|
|
declare(strict_types=1);
|
|
|
|
namespace Phpml\Clustering\KMeans;
|
|
|
|
use ArrayAccess;
|
|
|
|
class Point implements ArrayAccess, \Countable
|
|
{
|
|
/**
|
|
* @var int
|
|
*/
|
|
protected $dimension;
|
|
|
|
/**
|
|
* @var array
|
|
*/
|
|
protected $coordinates = [];
|
|
|
|
/**
|
|
* @var mixed
|
|
*/
|
|
protected $label;
|
|
|
|
/**
|
|
* @param mixed $label
|
|
*/
|
|
public function __construct(array $coordinates, $label = null)
|
|
{
|
|
$this->dimension = count($coordinates);
|
|
$this->coordinates = $coordinates;
|
|
$this->label = $label;
|
|
}
|
|
|
|
public function toArray(): array
|
|
{
|
|
return $this->coordinates;
|
|
}
|
|
|
|
/**
|
|
* @return float|int
|
|
*/
|
|
public function getDistanceWith(self $point, bool $precise = true)
|
|
{
|
|
$distance = 0;
|
|
for ($n = 0; $n < $this->dimension; ++$n) {
|
|
$difference = $this->coordinates[$n] - $point->coordinates[$n];
|
|
$distance += $difference * $difference;
|
|
}
|
|
|
|
return $precise ? $distance ** .5 : $distance;
|
|
}
|
|
|
|
/**
|
|
* @param Point[] $points
|
|
*/
|
|
public function getClosest(array $points): ?self
|
|
{
|
|
$minPoint = null;
|
|
|
|
foreach ($points as $point) {
|
|
$distance = $this->getDistanceWith($point, false);
|
|
|
|
if (!isset($minDistance)) {
|
|
$minDistance = $distance;
|
|
$minPoint = $point;
|
|
|
|
continue;
|
|
}
|
|
|
|
if ($distance < $minDistance) {
|
|
$minDistance = $distance;
|
|
$minPoint = $point;
|
|
}
|
|
}
|
|
|
|
return $minPoint;
|
|
}
|
|
|
|
public function getCoordinates(): array
|
|
{
|
|
return $this->coordinates;
|
|
}
|
|
|
|
/**
|
|
* @param mixed $offset
|
|
*/
|
|
public function offsetExists($offset): bool
|
|
{
|
|
return isset($this->coordinates[$offset]);
|
|
}
|
|
|
|
/**
|
|
* @param mixed $offset
|
|
*
|
|
* @return mixed
|
|
*/
|
|
public function offsetGet($offset)
|
|
{
|
|
return $this->coordinates[$offset];
|
|
}
|
|
|
|
/**
|
|
* @param mixed $offset
|
|
* @param mixed $value
|
|
*/
|
|
public function offsetSet($offset, $value): void
|
|
{
|
|
$this->coordinates[$offset] = $value;
|
|
}
|
|
|
|
/**
|
|
* @param mixed $offset
|
|
*/
|
|
public function offsetUnset($offset): void
|
|
{
|
|
unset($this->coordinates[$offset]);
|
|
}
|
|
|
|
public function count(): int
|
|
{
|
|
return count($this->coordinates);
|
|
}
|
|
}
|