function overshoot=Get_overshoot(yss,y);
%% overshoot=Get_overshoot(yss,y);
%% Find overshoot (percentage) of y
%% overshoot=nan; if yss is not determined.
%% PenChen Chou. 2004/1/15

if nargin~=2, 
    error('Error! No enough input arguments (need 2)!'); 
end
if yss==eps, 
   overshoot=nan; 
else
   ymax=max(y);
   if ymax>yss
      overshoot=100*(ymax-yss)/yss;
   else
      overshoot=1;
   end
end