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: atlas_lookup.m
    path of file: ./repos/spm/external/fieldtrip/plotting/private
    
    the code of the file until where you have to start completion: function [label] = 
    
function likes 3xN
elseif strcmp(coordsys, 'mni') && strcmp(atlas.coordsys, 'mni')
  % nothing to do
elseif strcmp(coordsys, 'tal') && strcmp(atlas.coordsys, 'tal')
  % nothing to do
elseif strcmp(coordsys, 'tal') && strcmp(atlas.coordsys, 'mni')
  pos = tal2mni(pos')'; % this function likes 3xN
elseif ~strcmp(coordsys, atlas.coordsys)
  ft_error('the mismatch between the coordinate system in the atlas and the coordinate system in the data cannot be resolved');
end