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: update_bit.m
    path of file: ./repos/polar-3gpp-matlab/components
    
    the code of the file until where you have to start completion: function update_bit(row, col)
% Copyright © 2017 Robert G. Maunder. This program is free software: you 
% can redistribute it and/or modify it under the terms of the GNU General 
% Public License as published by the Free Software Foundation, either 
% version 3 of the License, or (at your option) any later version. This 

    
function update_bit(row, col)
% Copyright © 2017 Robert G. Maunder. This program is free software: you 
% can redistribute it and/or modify it under the terms of the GNU General 
% Public License as published by the Free Software Foundation, either 
% version 3 of the License, or (at your option) any later version. This 
% program is distributed in the hope that it will be useful, but WITHOUT 
% ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 
% FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 
% more details.

global bits
global bits_updated

offset = size(bits,1)/2^(size(bits,2)-col+1);

for l = 1:size(bits,3)
    if mod(row-1,2*offset) >= offset
        if ~bits_updated(row,col-1)
            update_bit(row,col-1);
        end