how to plot H in this code? I have some difficulties?

Gv = graph({'s1' 's_1' 's2' 's_2' },{'s2' 's_2','s3' 's_3'});
Gv.Nodes.Service = {'s1','s2','s_1','s_2','s3','s_3'}';
Application = Gv.Nodes;

Gvsub = graph();
figure(3)
hold on
plot(Gvsub);
hold off
for i = 1:numnodes(Gv)
   if isempty(Gvsub.Nodes)
      H = addnode(Gvsub,Gv.Nodes.Service(i));
  else
      H = addnode(Gvsub,Gv.Nodes.Service(i));
  end
  Application(1,:) = [];   % REMOVING THE USED ROW AFTER BEING USED
end