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: vl_plotstyle.m
    path of file: ./repos/2015_Face_Detection/vlfeat/toolbox/plotop
    
    the code of the file until where you have to start completion: function style = vl_plotstyle(index)
% VL_PLOTSTYLES  Get a plot style
%   STYLES = VL_PLOTSTYLE(INDEX) returns a cell array of PLOT() options

    
function style = vl_plotstyle(index)
% VL_PLOTSTYLES  Get a plot style
%   STYLES = VL_PLOTSTYLE(INDEX) returns a cell array of PLOT() options
%   for the color/line style of index INDEX. The available styles are
%   defined the ColorOrder and LineStyleOrder properties of the
%   current axes and cycled first by color and then by line style.
%
%   If there is no current axes can be found, then VL_PLOTSTYLE() uses
%   the DefaultAxesColorOrder and DefaultLineStyleOrder root
%   properties.
%
%   If INDEXES has more than one element, then VL_PLOTSTYLE(INDEXES)
%   returns a cell array of styles of the same size of INDEXES.
%
%   Example::
%     The code fragment
%
%        set(gca,'LineStyleOrder', {'-','-.'}, 'NextPlot', 'replacechildren') ;
%        plot([1 2], [1:20 ; 1:20]') ;
%
%     and
%
%       set(gca,'NextPlot', 'replacechildren') ;
%       set(gca,'LineStyleOrder', {'-','-.'}) ;
%       for i = 1:20
%         style = vl_plotstyle(i) ;
%         plot([1 2], [i i], style{:}) ;
%         hold on ;
%       end