eta=-1; k=0.01;


ro=i*eta/2/(1-i*eta/2);
to=1/(1-i*eta/2);

for in=0:99
  k=2*pi/100*in;
  p=exp(i*k);
  R=ro;
  T=to;
  dat=[];
  for j=1:100
    r=ro+(rand(1)+i*rand(1))/100.*0;
    t=to+(rand(1)+i*rand(1))/100.*0;
  
    Rn=R+T^2*r*p^2/(1-p^2*r*R);
    Tn=T*t*p/(1-p^2*r*R);
  
    R=Rn; T=Tn;
    abs(R)^2+abs(T)^2;
    dat=[dat ; T];
  end
  hold off
  plot(dat,'b-')
  axis([-1 1 -1 1])
  hold on
  plot(real(dat(1)),imag(dat(1)),'r*')
  in
  pause
%  if (in<10)
%    eval(['print -dgif8 out0' num2str(in) '.gif']);
%  else
%    eval(['print -dgif8 out' num2str(in) '.gif']);
%  end
end