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File / Folder	Size	Action
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Decomposition	--	ren
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.htaccess	0.27KB	edt ren
Builder.php	1.74KB	edt ren
Div0Exception.php	0.249KB	edt ren
Exception.php	0.246KB	edt ren
Functions.php	11.01KB	edt ren
Matrix.php	11.702KB	edt ren
Operations.php	4.229KB	edt ren

<?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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