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: dicm2nii_untouched.m
    path of file: ./repos/bspm/thirdparty/dicm2nii
    
    the code of the file until where you have to start completion: function varargout = dicm2nii(src, dataFolder, varargin)
% Convert dicom and more into nii or img/hdr files. 
% 
% DICM2NII(dcmSource, niiFolder, outFormat, MoCoOption)
% 
% The input arguments are all optional:
%  1. source file or folder. It can be a zip or tgz file, a folder containing
%     dicom files, or other convertible files. It can also contain wildcards
%     like 'run
    
function vol = mos2vol(mos, nSL)
nMos = ceil(sqrt(nSL)); % always nMos x nMos tiles
[nr, nc, nv] = size(mos); % number of row, col and vol in mosaic

nr = nr / nMos; nc = nc / nMos; % number of row and col in slice
vol = zeros([nr nc nSL nv], class(mos)); %#ok
for i = 1:nSL
    r =    mod(i-1, nMos) * nr + (1:nr); % 2nd slice is tile(2,1)
    c = floor((i-1)/nMos) * nc + (1:nc);
    % r = floor((i-1)/nMos) * nr + (1:nr); % 2nd slice is tile(1,2)
    % c =    mod(i-1, nMos) * nc + (1:nc);
    vol(:, :, i, :) = mos(r, c, :);
end