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_demo_kdtree_plot.m
    path of file: ./repos/robotic_perception/Trafic_Sign_Recognition/code/vlfeat-0.9.20-bin/vlfeat-0.9.20/toolbox/demo
    
    the code of the file until where you have to start completion: function h = vl_demo_kdtree_plot(kdtree, nodeIndex, xlim, ylim)
% VL_DEMO_KDTREE_PLOT


    
function h = vl_demo_kdtree_plot(kdtree, nodeIndex, xlim, ylim)
% VL_DEMO_KDTREE_PLOT

% Copyright (C) 2007-12 Andrea Vedaldi and Brian Fulkerson.
% All rights reserved.
%
% This file is part of the VLFeat library and is made available under
% the terms of the BSD license (see the COPYING file).

dim        = kdtree.nodes.splitDimension(nodeIndex) ;
thresh     = kdtree.nodes.splitThreshold(nodeIndex) ;
lowerChild  = kdtree.nodes.lowerChild(nodeIndex) ;
upperChild = kdtree.nodes.upperChild(nodeIndex) ;

if dim == 1
  xs = [thresh, thresh] ;
  ys = ylim ;
  ylimLower = ylim ;
  ylimUpper = ylim ;
  xlimLower = [xlim(1) thresh] ;
  xlimUpper = [thresh xlim(2)] ;
else
  xs = xlim ;
  ys = [thresh, thresh] ;
  xlimLower = xlim ;
  xlimUpper = xlim ;
  ylimLower = [ylim(1) thresh] ;
  ylimUpper = [thresh ylim(2)] ;
end