function display_b(analysis,ys)
%displys the inference from vision_engine_b
 symbols='s*.-+';
n=length(ys(:,1));ys=[ys;ys(1,:)];
for i=1:n
   v=[i i+1];
   plot(ys(v,1),ys(v,2),symbols(analysis(i,1)))
   hold on
end
title('square =1; * =2; . =3; - =4; + =5')
hold off