Minkowski::run() - Code Metrics - stojg/recommend - Measure and Improve Code Quality continuously with Scrutinizer

Minkowski::run() A
last analyzed 2015-12-03 06:43 UTC

↳ Parent: Minkowski

Complexity

Conditions	4
Paths	6

Size

Total Lines	16
Code Lines	10

Duplication

Lines	0
Ratio	0 %

Importance

Changes	1
Bugs	0	Features	0

Metric	Value
c	1
b	0
f	0
dl	0
loc	16
rs	9.2
cc	4
eloc	10
nc	6
nop	2

<?php

namespace stojg\recommend\strategy;

/**
 * Computes the Minkowski distance.
 * 
 * If the data is dense (almost all attributes have a non
 * zero value) and the magnitude of the attributes values
 * are important, this is a good similarity comparisator
 */
class Minkowski
{
    /**
     * @var int
     */
    protected $r = 1;

    /**
     * @param int $r
     */
    public function __construct($r = 1)
    {
        $this->r = $r;
    }

    /**
     * Both rating1 and rating2 are an array of the form
     * ['The Strokes'=> 3.0, 'Slightly Stoopid' =>  2.5, ...].
     * 
     * @param array $rating1
     * @param array $rating2
     */
    public function run($rating1, $rating2)
    {
        $distance = 0;
        $commonRatings = false;
        foreach ($rating1 as $key => $rating) {
            if (isset($rating2[$key])) {
                $distance += pow(abs($rating - $rating2[$key]), $this->r);
                $commonRatings = true;
            }
        }
        if ($commonRatings) {
            return pow($distance, 1 / $this->r);
        }

        return false;
    }
}


1			<?php
2
3			namespace stojg\recommend\strategy;
4
5			/**
6			* Computes the Minkowski distance.
7			*
8			* If the data is dense (almost all attributes have a non
9			* zero value) and the magnitude of the attributes values
10			* are important, this is a good similarity comparisator
11			*/
12			class Minkowski
13			{
14			/**
15			* @var int
16			*/
17			protected $r = 1;
18
19			/**
20			* @param int $r
21			*/
22			public function __construct($r = 1)
23			{
24			$this->r = $r;
25			}
26
27			/**
28			* Both rating1 and rating2 are an array of the form
29			* ['The Strokes'=> 3.0, 'Slightly Stoopid' => 2.5, ...].
30			*
31			* @param array $rating1
32			* @param array $rating2
33			*/
34			public function run($rating1, $rating2)
35			{
36			$distance = 0;
37			$commonRatings = false;
38			foreach ($rating1 as $key => $rating) {
39			if (isset($rating2[$key])) {
40			$distance += pow(abs($rating - $rating2[$key]), $this->r);
41			$commonRatings = true;
42			}
43			}
44			if ($commonRatings) {
45			return pow($distance, 1 / $this->r);
46			}
47
48			return false;
49			}
50			}
51

stojg / recommend

Minkowski::run() A last analyzed 2015-12-03 06:43 UTC

Complexity

Size

Duplication

Importance

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Minkowski::run() A
last analyzed 2015-12-03 06:43 UTC