Matrix::divideByScalar() - Code Metrics - Inspection of "change Classifier namespace to Classification" - php-ai/php-ml - Measure and Improve Code Quality continuously with Scrutinizer

Completed

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by Arkadiusz

created 2016-04-30 21:45 UTC

Matrix::divideByScalar() A

↳ Parent: Matrix

Complexity

Conditions	3
Paths	3

Size

Total Lines	11
Code Lines	6

Duplication

Lines	0
Ratio	0 %

Importance

Changes	2
Bugs	0	Features	0

Metric	Value
c	2
b	0
f	0
dl	0
loc	11
rs	9.4285
cc	3
eloc	6
nc	3
nop	1

<?php

declare (strict_types = 1);

namespace Phpml\Math;

use Phpml\Exception\InvalidArgumentException;
use Phpml\Exception\MatrixException;

class Matrix
{
    /**
     * @var array
     */
    private $matrix;

    /**
     * @var int
     */
    private $rows;

    /**
     * @var int
     */
    private $columns;

    /**
     * @var float
     */
    private $determinant;

    /**
     * @param array $matrix
     * @param bool  $validate
     *
     * @throws InvalidArgumentException
     */
    public function __construct(array $matrix, bool $validate = true)
    {
        $this->rows = count($matrix);
        $this->columns = count($matrix[0]);

        if ($validate) {
            for ($i = 0; $i < $this->rows; ++$i) {
                if (count($matrix[$i]) !== $this->columns) {
                    throw InvalidArgumentException::matrixDimensionsDidNotMatch();
                }
            }
        }

        $this->matrix = $matrix;
    }

    /**
     * @param array $array
     * 
     * @return Matrix
     */
    public static function fromFlatArray(array $array)
    {
        $matrix = [];
        foreach ($array as $value) {
            $matrix[] = [$value];
        }

        return new self($matrix);
    }

    /**
     * @return array
     */
    public function toArray()
    {
        return $this->matrix;
    }

    /**
     * @return int
     */
    public function getRows()
    {
        return $this->rows;
    }

    /**
     * @return int
     */
    public function getColumns()
    {
        return $this->columns;
    }

    /**
     * @param $column
     *
     * @return array
     *
     * @throws MatrixException
     */
    public function getColumnValues($column)
    {
        if ($column >= $this->columns) {
            throw MatrixException::columnOutOfRange();
        }

        $values = [];
        for ($i = 0; $i < $this->rows; ++$i) {
            $values[] = $this->matrix[$i][$column];
        }

        return $values;
    }

    /**
     * @return float|int
     * 
     * @throws MatrixException
     */
    public function getDeterminant()
    {
        if ($this->determinant) {
            return $this->determinant;
        }

        if (!$this->isSquare()) {
            throw MatrixException::notSquareMatrix();
        }

        $determinant = 0;
        if ($this->rows == 1 && $this->columns == 1) {
            $determinant = $this->matrix[0][0];
        } elseif ($this->rows == 2 && $this->columns == 2) {
            $determinant =
                $this->matrix[0][0] * $this->matrix[1][1] -
                $this->matrix[0][1] * $this->matrix[1][0];
        } else {
            for ($j = 0; $j < $this->columns; ++$j) {
                $subMatrix = $this->crossOut(0, $j);
                $minor = $this->matrix[0][$j] * $subMatrix->getDeterminant();
                $determinant += fmod($j, 2) == 0 ? $minor : -$minor;
            }
        }

        return $this->determinant = $determinant;
    }

    /**
     * @return bool
     */
    public function isSquare()
    {
        return $this->columns === $this->rows;
    }

    /**
     * @return Matrix
     */
    public function transpose()

    {
        $newMatrix = [];
        for ($i = 0; $i < $this->rows; ++$i) {
            for ($j = 0; $j < $this->columns; ++$j) {
                $newMatrix[$j][$i] = $this->matrix[$i][$j];
            }
        }

        return new self($newMatrix, false);
    }

    /**
     * @param Matrix $matrix
     *
     * @return Matrix
     *
     * @throws InvalidArgumentException
     */
    public function multiply(Matrix $matrix)
    {
        if ($this->columns != $matrix->getRows()) {
            throw InvalidArgumentException::inconsistentMatrixSupplied();
        }

        $product = [];
        $multiplier = $matrix->toArray();
        for ($i = 0; $i < $this->rows; ++$i) {
            for ($j = 0; $j < $matrix->getColumns(); ++$j) {
                $product[$i][$j] = 0;
                for ($k = 0; $k < $this->columns; ++$k) {
                    $product[$i][$j] += $this->matrix[$i][$k] * $multiplier[$k][$j];
                }
            }
        }

        return new self($product, false);
    }

    /**
     * @param $value
     *
     * @return Matrix
     */
    public function divideByScalar($value)

    {
        $newMatrix = array();
        for ($i = 0; $i < $this->rows; ++$i) {
            for ($j = 0; $j < $this->columns; ++$j) {
                $newMatrix[$i][$j] = $this->matrix[$i][$j] / $value;
            }
        }

        return new self($newMatrix, false);
    }

    /**
     * @return Matrix
     *
     * @throws MatrixException
     */
    public function inverse()
    {
        if (!$this->isSquare()) {
            throw MatrixException::notSquareMatrix();
        }

        $newMatrix = array();
        for ($i = 0; $i < $this->rows; ++$i) {
            for ($j = 0; $j < $this->columns; ++$j) {
                $subMatrix = $this->crossOut($i, $j);
                if (fmod($i + $j, 2) == 0) {
                    $newMatrix[$i][$j] = ($subMatrix->getDeterminant());
                } else {
                    $newMatrix[$i][$j] = -($subMatrix->getDeterminant());
                }
            }
        }

        $cofactorMatrix = new self($newMatrix, false);

        return $cofactorMatrix->transpose()->divideByScalar($this->getDeterminant());
    }

    /**
     * @param int $row
     * @param int $column
     *
     * @return Matrix
     */
    public function crossOut(int $row, int $column)
    {
        $newMatrix = [];
        $r = 0;
        for ($i = 0; $i < $this->rows; ++$i) {
            $c = 0;
            if ($row != $i) {
                for ($j = 0; $j < $this->columns; ++$j) {
                    if ($column != $j) {
                        $newMatrix[$r][$c] = $this->matrix[$i][$j];
                        ++$c;
                    }
                }
                ++$r;
            }
        }

        return new self($newMatrix, false);
    }
}


1			<?php
2
3			declare (strict_types = 1);
4
5			namespace Phpml\Math;
6
7			use Phpml\Exception\InvalidArgumentException;
8			use Phpml\Exception\MatrixException;
9
10			class Matrix
11			{
12			/**
13			* @var array
14			*/
15			private $matrix;
16
17			/**
18			* @var int
19			*/
20			private $rows;
21
22			/**
23			* @var int
24			*/
25			private $columns;
26
27			/**
28			* @var float
29			*/
30			private $determinant;
31
32			/**
33			* @param array $matrix
34			* @param bool $validate
35			*
36			* @throws InvalidArgumentException
37			*/
38			public function __construct(array $matrix, bool $validate = true)
39			{
40			$this->rows = count($matrix);
41			$this->columns = count($matrix[0]);
42
43			if ($validate) {
44			for ($i = 0; $i < $this->rows; ++$i) {
45			if (count($matrix[$i]) !== $this->columns) {
46			throw InvalidArgumentException::matrixDimensionsDidNotMatch();
47			}
48			}
49			}
50
51			$this->matrix = $matrix;
52			}
53
54			/**
55			* @param array $array
56			*
57			* @return Matrix
58			*/
59			public static function fromFlatArray(array $array)
60			{
61			$matrix = [];
62			foreach ($array as $value) {
63			$matrix[] = [$value];
64			}
65
66			return new self($matrix);
67			}
68
69			/**
70			* @return array
71			*/
72			public function toArray()
73			{
74			return $this->matrix;
75			}
76
77			/**
78			* @return int
79			*/
80			public function getRows()
81			{
82			return $this->rows;
83			}
84
85			/**
86			* @return int
87			*/
88			public function getColumns()
89			{
90			return $this->columns;
91			}
92
93			/**
94			* @param $column
95			*
96			* @return array
97			*
98			* @throws MatrixException
99			*/
100			public function getColumnValues($column)
101			{
102			if ($column >= $this->columns) {
103			throw MatrixException::columnOutOfRange();
104			}
105
106			$values = [];
107			for ($i = 0; $i < $this->rows; ++$i) {
108			$values[] = $this->matrix[$i][$column];
109			}
110
111			return $values;
112			}
113
114			/**
115			* @return float\|int
116			*
117			* @throws MatrixException
118			*/
119			public function getDeterminant()
120			{
121			if ($this->determinant) {
122			return $this->determinant;
123			}
124
125			if (!$this->isSquare()) {
126			throw MatrixException::notSquareMatrix();
127			}
128
129			$determinant = 0;
130			if ($this->rows == 1 && $this->columns == 1) {
131			$determinant = $this->matrix[0][0];
132			} elseif ($this->rows == 2 && $this->columns == 2) {
133			$determinant =
134			$this->matrix[0][0] * $this->matrix[1][1] -
135			$this->matrix[0][1] * $this->matrix[1][0];
136			} else {
137			for ($j = 0; $j < $this->columns; ++$j) {
138			$subMatrix = $this->crossOut(0, $j);
139			$minor = $this->matrix[0][$j] * $subMatrix->getDeterminant();
140			$determinant += fmod($j, 2) == 0 ? $minor : -$minor;
141			}
142			}
143
144			return $this->determinant = $determinant;
145			}
146
147			/**
148			* @return bool
149			*/
150			public function isSquare()
151			{
152			return $this->columns === $this->rows;
153			}
154
155			/**
156			* @return Matrix
157			*/
158			public function transpose()
			0 ignored issues – show Duplication introduced 2016-04-29 23:01 UTC by Report Bug Copy Issue Report This method seems to be duplicated in your project. Duplicated code is one of the most pungent code smells. If you need to duplicate the same code in three or more different places, we strongly encourage you to look into extracting the code into a single class or operation. You can also find more detailed suggestions in the “Code” section of your repository. Loading history...
159			{
160			$newMatrix = [];
161			for ($i = 0; $i < $this->rows; ++$i) {
162			for ($j = 0; $j < $this->columns; ++$j) {
163			$newMatrix[$j][$i] = $this->matrix[$i][$j];
164			}
165			}
166
167			return new self($newMatrix, false);
168			}
169
170			/**
171			* @param Matrix $matrix
172			*
173			* @return Matrix
174			*
175			* @throws InvalidArgumentException
176			*/
177			public function multiply(Matrix $matrix)
178			{
179			if ($this->columns != $matrix->getRows()) {
180			throw InvalidArgumentException::inconsistentMatrixSupplied();
181			}
182
183			$product = [];
184			$multiplier = $matrix->toArray();
185			for ($i = 0; $i < $this->rows; ++$i) {
186			for ($j = 0; $j < $matrix->getColumns(); ++$j) {
187			$product[$i][$j] = 0;
188			for ($k = 0; $k < $this->columns; ++$k) {
189			$product[$i][$j] += $this->matrix[$i][$k] * $multiplier[$k][$j];
190			}
191			}
192			}
193
194			return new self($product, false);
195			}
196
197			/**
198			* @param $value
199			*
200			* @return Matrix
201			*/
202			public function divideByScalar($value)
			0 ignored issues – show Duplication introduced 2016-04-29 23:01 UTC by Report Bug Copy Issue Report This method seems to be duplicated in your project. Duplicated code is one of the most pungent code smells. If you need to duplicate the same code in three or more different places, we strongly encourage you to look into extracting the code into a single class or operation. You can also find more detailed suggestions in the “Code” section of your repository. Loading history...
203			{
204			$newMatrix = array();
205			for ($i = 0; $i < $this->rows; ++$i) {
206			for ($j = 0; $j < $this->columns; ++$j) {
207			$newMatrix[$i][$j] = $this->matrix[$i][$j] / $value;
208			}
209			}
210
211			return new self($newMatrix, false);
212			}
213
214			/**
215			* @return Matrix
216			*
217			* @throws MatrixException
218			*/
219			public function inverse()
220			{
221			if (!$this->isSquare()) {
222			throw MatrixException::notSquareMatrix();
223			}
224
225			$newMatrix = array();
226			for ($i = 0; $i < $this->rows; ++$i) {
227			for ($j = 0; $j < $this->columns; ++$j) {
228			$subMatrix = $this->crossOut($i, $j);
229			if (fmod($i + $j, 2) == 0) {
230			$newMatrix[$i][$j] = ($subMatrix->getDeterminant());
231			} else {
232			$newMatrix[$i][$j] = -($subMatrix->getDeterminant());
233			}
234			}
235			}
236
237			$cofactorMatrix = new self($newMatrix, false);
238
239			return $cofactorMatrix->transpose()->divideByScalar($this->getDeterminant());
240			}
241
242			/**
243			* @param int $row
244			* @param int $column
245			*
246			* @return Matrix
247			*/
248			public function crossOut(int $row, int $column)
249			{
250			$newMatrix = [];
251			$r = 0;
252			for ($i = 0; $i < $this->rows; ++$i) {
253			$c = 0;
254			if ($row != $i) {
255			for ($j = 0; $j < $this->columns; ++$j) {
256			if ($column != $j) {
257			$newMatrix[$r][$c] = $this->matrix[$i][$j];
258			++$c;
259			}
260			}
261			++$r;
262			}
263			}
264
265			return new self($newMatrix, false);
266			}
267			}
268

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Matrix::divideByScalar() A

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