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: description.m
    path of file: ./repos/hctsa/Toolboxes/OpenTSTOOL/tstoolbox/@description
    
    the code of the file until where you have to start completion: function d = description(varargin)

    
function d = description(varargin)

%tstoolbox/@description/description
%   description class constructor Syntax:
%     * d = description()
%     * d = description(name)
%     * d = description(name, type)
%     * d = description(yunit)
%
%   An object of class description contains auxiliary descriptive
%   information for a signal, e.g. information about data unit, creator,
%   how the signal should be plotted, a user specified comment text, a
%   processing history and the commandlines that were used to generate
%   this signal
%
% Copyright 1997-2001 DPI Goettingen, License http://www.physik3.gwdg.de/tstool/gpl.txt


d.label = '';				% may be used to freely by the user, will be continued when producing a new signal (optional)
d.name = '';			  	% set when loaded from file, otherwise empty, will not be continued in processing (optional)
d.type = '';		  		% 'Spectrum', 'Time-Signal', 'Matrix', 'Image' , 'Spektrogramm' etc. (optional)
d.plothint = '';			% Recommend