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1 <?php 2 3 declare(strict_types=1); 4 5 namespace Phpml\Math\Distance; 6 7 use Phpml\Exception\InvalidArgumentException; 8 use Phpml\Math\Distance as DistanceInterface; 9 10 /** 11 * Class Distance 12 */ 13 abstract class Distance implements DistanceInterface 14 { 15 /** 16 * @var float|int 17 */ 18 public $norm; 19 20 /** 21 * Distance constructor. 22 */ 23 public function __construct(float $norm = 3.0) 24 { 25 $this->norm = $norm; 26 } 27 28 /** 29 * @throws InvalidArgumentException 30 */ 31 public function distance(array $a, array $b): float 32 { 33 $distance = 0; 34 35 foreach ($this->deltas($a, $b) as $delta) { 36 $distance += $delta ** $this->norm; 37 } 38 39 return $distance ** (1 / $this->norm); 40 } 41 42 /** 43 * @throws InvalidArgumentException 44 */ 45 protected function deltas(array $a, array $b): array 46 { 47 $count = count($a); 48 49 if ($count !== count($b)) { 50 throw new InvalidArgumentException('Size of given arrays does not match'); 51 } 52 53 $deltas = []; 54 55 for ($i = 0; $i < $count; $i++) { 56 $deltas[] = abs($a[$i] - $b[$i]); 57 } 58 59 return $deltas; 60 } 61 }
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