/// <summary>
///
/// </summary>
/// <param name="i"></param>
/// <param name="j"></param>
/// <returns></returns>
public T this[int i, int j]
{
get
{
CoreUtil.BoundsCheck(i, CountX);
return(_values[IndexAtUnchecked(i, j)]);
}
set
{
CoreUtil.BoundsCheck(i, CountX);
_values[IndexAtUnchecked(i, j)] = value;
}
}