%%*****************************************************************
%% viewgraph: plot the graph of an adjacency matrix.
%%*****************************************************************
%% SDPT3: version 4.0
%% Copyright (c) 1997 by
%% Kim-Chuan Toh, Michael J. Todd, Reha H. Tutuncu
%% Last Modified: 16 Sep 2004
%%*****************************************************************

   function viewgraph(B);

   n = length(B); 
   z = exp(2*pi*sqrt(-1)*[0:n-1]/n);
   circle = exp(2*pi*sqrt(-1)*linspace(0,1,100)); 
   plot(circle,':'); hold on
   axis('square'); 
   for i = 1:n
       idx = find(B(i,i+1:n) == 1);
       idx = idx + i;
       for k = 1:length(idx)
           z1 = z(i); z2 = z(idx(k)); 
           plot([real(z1) real(z2)],[imag(z1) imag(z2)]); 
       end;
   end;
   plot(z,'.r','markersize',16); 
   hold off;
%%=====================================================