def _parse_is_sub_array_assignment(line):
    """
    :param line: String line
    :returns: True if the statment is a sub array assignment. False otherwise.

    >>> line = 'Map(:,:,1) = [1 2 3];'
    >>> _parse_is_sub_array_assignment(line)
    True

    """
    lhs = line.split(' = ')[0].strip()
    if '(' in lhs:
        return True
    return False