public override string ToString()
        {
            return ToString("G", CultureInfo.CurrentCulture);
        }

        /// <summary>
        /// Вид форматной строки: {index[:formatString][,alignment]}
        /// </summary>
        public string ToString(string _format)
        {
            return ToString(_format, CultureInfo.CurrentCulture);
        }

        /// <summary>
        /// Вид форматной строки: {index[:formatString][,alignment]}
        /// </summary>
        public string ToString(string _format, IFormatProvider _provider)
        {
            if (_matrix == null)
                return "null";

            _provider = _provider ?? CultureInfo.CurrentCulture;

            string width = "0";

            if (string.IsNullOrEmpty(_format))
                _format = "{0:G} ";
            else if (_format.IndexOf(',') != -1)
            {
                int index = _format.IndexOf(',');

                width = _format.Substring(index + 1);
                _format = string.Format("{{0,{0}:{1}}}", width, _format.Substring(0, index));

                if (width == "" || _format == "")
                    throw new FormatException(string.Format("Неверный формат для печати матрицы {0}", _id));
            }
            else
            {
                width = char.IsLetter(_format[0]) || _format[0] == '0' ? "12" : _format;
                _format = string.Format(char.IsLetter(_format[0]) || _format[0] == '0' ? "{{0:{0}}} " : "{{0,{0}}}", _format);
            }

            StringBuilder str = new StringBuilder(Convert.ToInt32(width) * _matrix.Length + 2 * _matrix.GetLength(0));

            for (int i = 0; i < _matrix.GetLength(0); i++)
            {
                for (int j = 0; j < _matrix.GetLength(1); j++)
                    str.AppendFormat(_format, _matrix[i, j]);

                str.AppendFormat("\n");
            }

            return str.ToString();
        }

        object ICloneable.Clone()
        {
            return Clone();
        }

        public Matrix Clone()
        {
            Matrix clone = new Matrix(this);

            return clone;
        }