MCordingley\LinearAlgebra\Matrix::pad PHP Метод

    private function pad(int $size) : self
    {
        $nextPower = pow(2, ceil(log($size, 2)));
        $padded = $this->toArray();
        for ($row = 0; $row < $size; $row++) {
            for ($column = $size; $column < $nextPower; $column++) {
                $padded[$row][$column] = $row === $column ? 1 : 0;
            }
        }
        for ($row = $size; $row < $nextPower; $row++) {
            $padded[] = [];
            for ($column = 0; $column < $nextPower; $column++) {
                $padded[$row][$column] = $row === $column ? 1 : 0;
            }
        }
        return new static($padded);
    }