function cidx=plotng01(C)
%Plots the connections in C as line segments.
%  C is the center structure that is constructed
%    by the neural gas routine.  cflag returns 1
%    if there are no connections.

[m,n]=size(C.M);  %A square matrix
cidx=0;

for i=1:n
  for j=1:n
    if C.M(i,j)==1
      cidx=cidx+1;
      Lx(:,cidx)=C.cen(:,i);
      Ly(:,cidx)=C.cen(:,j);
    end
  end
end

if cidx==0
   disp('No connections');
end

for i=1:cidx
  line([Lx(1,i) Ly(1,i)],[Lx(2,i), Ly(2,i)]);
  if i==1
    hold on
  end
end