You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: length.m
    path of file: ./repos/mpsim/lib/class/packed/@packed
    
    the code of the file until where you have to start completion: function answer = length (A)
    % for some unknown reason, the builtin length() was not
    % giving the correct answer for an empty packed obj.
    switch nargin
    case 0
        error('packed:length:notEnoughInputs', ...
        'Not enough input parameters.');

    
function answer = length (A)
    % for some unknown reason, the builtin length() was not
    % giving the correct answer for an empty packed obj.
    switch nargin
    case 0
        error('packed:length:notEnoughInputs', ...
        'Not enough input parameters.');
    case 1
        myassert(size(A, 1), size(A, 2));
        answer = size(A, 1);
    otherwise
        error('packed:length:tooManyInputs', ...
        'Too many input parameters.');
    end