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: similaritygraph.m
    path of file: ./repos/fit/FITv2.0e/ica_fuse/toolbox/icasso122
    
    the code of the file until where you have to start completion: function h=similaritygraph(coord,S,lim,lcolor)
%function h=similaritygraph(coord,[S],[lim],[lcolor])
%
%PURPOSE
%
%To visualize a weighted graph
% 
%INPUT 
%
%[An argument in brackets is optional. If it isn't  given or it's
% an empty matrix/string, the function will use a default value.] 
%
% coord    (Mx2 matrix) coordinates
% [S]      (MxM matrix) similarity matrix: if thi
    
function always adds to a plot (turns 'hold on' temporarily).
%
%Output is a structure of handles to graphic objects etc
%
% h.graph   (vector) graphic handles to all edges (lines)
% h.vertex  (vector) graphic handles to all vertices (markers)
% h.example (vector) contains one example (graphic handle) of each
%             different line type (gray level); needed for legend 
% h.text    (cell array of strings) contains labels for lines in h.example
%             legend(h.example,h.text) sets a proper legend for the
%             graph line colors
%
%If there are no values in ith bin, the shade is left out, and
%h.graph(i)=[], h.example(i)=NaN, and h.text(i)='' will be set.
%
%USED IN
% icassoGraph

%COPYRIGHT NOTICE
%This function is a part of Icasso software library
%Copyright (C) 2003-2005 Johan Himberg
%
%This program is free software; you can redistribute it and/or
%modify it under the terms of the GNU General Public License
%as published by the Free Software Foundation; either version 2
%of the License, or any later version.
%
%This program is distributed in the hope that it will be useful,
%but WITHOUT ANY WARRANTY; without even the implied warranty of
%MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
%GNU General Public License for more details.
%
%You should have received a copy of the GNU General Public License
%along with this program; if not, write to the Free Software
%Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

isHold=ishold;
hold on;

if nargin<3|isempty(lim),
  lim=[.5 .75 .9 1];
end

if nargin<2,
  S=zeros(size(coord,1));
end