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: end.m
    path of file: ./repos/gift/GroupICAT/icatb/icatb_spm_files/@icatb_file_array
    
    the code of the file until where you have to start completion: function en = end(a,k,n)
% Overloaded end function for file_array objects.
%_________________________________
    
function for file_array objects.
%__________________________________________________________________________
% Copyright (C) 2005-2017 Wellcome Trust Centre for Neuroimaging

%
% $Id: end.m 7147 2017-08-03 14:07:01Z spm $


dim = size(a);
if k>length(dim)
    en = 1;
else
    if n<length(dim)
    dim = [dim(1:(n-1)) prod(dim(n:end