vendor/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Shared/JAMA/Matrix.php

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<?php

namespace PhpOffice\PhpSpreadsheet\Shared\JAMA;

use PhpOffice\PhpSpreadsheet\Calculation\Exception as CalculationException;
use PhpOffice\PhpSpreadsheet\Calculation\Functions;
use PhpOffice\PhpSpreadsheet\Shared\StringHelper;

/**
 * Matrix class.
 *
 * @author Paul Meagher
 * @author Michael Bommarito
 * @author Lukasz Karapuda
 * @author Bartek Matosiuk
 *
 * @version 1.8
 *
 * @see https://math.nist.gov/javanumerics/jama/
 */
class Matrix
{
    const POLYMORPHIC_ARGUMENT_EXCEPTION = 'Invalid argument pattern for polymorphic function.';
    const ARGUMENT_TYPE_EXCEPTION = 'Invalid argument type.';
    const ARGUMENT_BOUNDS_EXCEPTION = 'Invalid argument range.';
    const MATRIX_DIMENSION_EXCEPTION = 'Matrix dimensions are not equal.';
    const ARRAY_LENGTH_EXCEPTION = 'Array length must be a multiple of m.';
    const MATRIX_SPD_EXCEPTION = 'Can only perform operation on symmetric positive definite matrix.';

    /**
     * Matrix storage.
     *
     * @var array
     */
    public $A = [];

    /**
     * Matrix row dimension.
     *
     * @var int
     */
    private $m;

    /**
     * Matrix column dimension.
     *
     * @var int
     */
    private $n;

    /**
     * Polymorphic constructor.
     *
     * As PHP has no support for polymorphic constructors, we use tricks to make our own sort of polymorphism using func_num_args, func_get_arg, and gettype. In essence, we're just implementing a simple RTTI filter and calling the appropriate constructor.
     */
    public function __construct(...$args)
    {
        if (count($args) > 0) {
            $match = implode(',', array_map('gettype', $args));