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: plot.m
    path of file: ./repos/chebfun/@classicfun
    
    the code of the file until where you have to start completion: function varargout = plot(f, varargin)
%PLOT   Basic linear plot for CLASSICFUN objects. 

    
function varargout = plot(f, varargin)
%PLOT   Basic linear plot for CLASSICFUN objects. 
%   PLOT(F) plots the CLASSICFUN object F.
%
%   PLOT(F, S) allows various line types, plot symbols, and colors to be used
%   when S is a character string made from one element from any or all the
%   following 3 columns:
%  
%            b     blue          .     point              -     solid
%            g     green         o     circle             :     dotted
%            r     red           x     x-mark             -.    dashdot 
%            c     cyan          +     plus               --    dashed   
%            m     magenta       *     star             (none)  no line
%            y     yellow        s     square
%            k     black         d     diamond
%            w     white         v     triangle (down)
%                                ^     triangle (up)
%                                <     triangle (left)
%                                >     triangle (right)
%                                p     pentagram
%                                h     hexagram
%
%   The X,Y pairs, or X,Y,S triples, can be followed by parameter/value
%   pairs to specify additional properties of the lines. For example,
%            F = bndfun(@sin, [-2 7]);
%            plot(F, 'LineWidth', 2, 'Color', [.6 0 0]) 
%   will create a plot with a dark red line of width 2 points.
%
%   The line data for the plot is determined by PLOTDATA, which queries F.onefun
%   for suitable information. CLASSICFUN/PLOT will display points at sample values (if
%   returned by PLOTDATA) on if LENGTH(F) < 257.
%
%   H1 = PLOT(F) returns a column vector of handles to lineseries objects, one
%   handle per plotted line (in the case of array-valued CLASSICFUN objects).    
%   [H1, H2] returns a second vector of column handles, this time for each of
%   the marker plots.
%
% See also PLOTDATA.

% Copyright 2017 by The University of Oxford and The Chebfun Developers. 
% See http://www.chebfun.org/ for Chebfun information.

% Deal with an empty input:
if ( isempty(f) )
    if ( nargout == 1 )
        varargout{1} = plot([]);
    end