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Edit File : Builder.php \| Size : 1.67 KB
<?php /** * * Class for the creating "special" Matrices * * @copyright Copyright (c) 2018 Mark Baker (https://github.com/MarkBaker/PHPMatrix) * @license https://opensource.org/licenses/MIT MIT / namespace Matrix; /* * Matrix Builder class. * * @package Matrix / class Builder { /* * Create a new matrix of specified dimensions, and filled with a specified value * If the column argument isn't provided, then a square matrix will be created * * @param mixed $fillValue * @param int $rows * @param int\|null $columns * @return Matrix * @throws Exception / public static function createFilledMatrix($fillValue, $rows, $columns = null) { if ($columns === null) { $columns = $rows; } $rows = Matrix::validateRow($rows); $columns = Matrix::validateColumn($columns); return new Matrix( array_fill( 0, $rows, array_fill( 0, $columns, $fillValue ) ) ); } /* * Create a new identity matrix of specified dimensions * This will always be a square matrix, with the number of rows and columns matching the provided dimension * * @param int $dimensions * @return Matrix * @throws Exception */ public static function createIdentityMatrix($dimensions, $fillValue = null) { $grid = static::createFilledMatrix($fillValue, $dimensions)->toArray(); for ($x = 0; $x < $dimensions; ++$x) { $grid[$x][$x] = 1; } return new Matrix($grid); } } Back

Edit File : Builder.php | Size : 1.67 KB

<?php

/**
 *
 * Class for the creating "special" Matrices
 *
 * @copyright  Copyright (c) 2018 Mark Baker (https://github.com/MarkBaker/PHPMatrix)
 * @license    https://opensource.org/licenses/MIT    MIT
 */

namespace Matrix;

/**
 * Matrix Builder class.
 *
 * @package Matrix
 */
class Builder
{
    /**
     * Create a new matrix of specified dimensions, and filled with a specified value
     * If the column argument isn't provided, then a square matrix will be created
     *
     * @param mixed $fillValue
     * @param int $rows
     * @param int|null $columns
     * @return Matrix
     * @throws Exception
     */
    public static function createFilledMatrix($fillValue, $rows, $columns = null)
    {
        if ($columns === null) {
            $columns = $rows;
        }

$rows = Matrix::validateRow($rows);
        $columns = Matrix::validateColumn($columns);

return new Matrix(
            array_fill(
                0,
                $rows,
                array_fill(
                    0,
                    $columns,
                    $fillValue
                )
            )
        );
    }

/**
     * Create a new identity matrix of specified dimensions
     * This will always be a square matrix, with the number of rows and columns matching the provided dimension
     *
     * @param int $dimensions
     * @return Matrix
     * @throws Exception
     */
    public static function createIdentityMatrix($dimensions, $fillValue = null)
    {
        $grid = static::createFilledMatrix($fillValue, $dimensions)->toArray();

for ($x = 0; $x < $dimensions; ++$x) {
            $grid[$x][$x] = 1;
        }

return new Matrix($grid);
    }
}

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