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: ft_datatype_comp.m
    path of file: ./repos/spm12/external/fieldtrip/utilities
    
    the code of the file until where you have to start completion: function [comp] = ft_datatype_comp(comp, varargin)

% FT_DATATYPE_COMP describes the FieldTrip MATLAB structure for comp data

    
function [comp] = ft_datatype_comp(comp, varargin)

% FT_DATATYPE_COMP describes the FieldTrip MATLAB structure for comp data
%
% The comp data structure represents time-series channel-level data that has
% been decomposed or unmixed from the channel level into its components or
% "blind sources", for example using ICA (independ