function flago=qobsv(a,c)
% 確定狀態(A,C)對的可觀測性

% Copyright 2001-2002 ECUST. 
%   $Revision: 1.2 $  $Date: 2002/02/22 19:21:44 $

S=obsv(a,c);nc=rank(S);n=size(a,1);
if n==nc,flago='system is completely state observable';
else flago='system is not completely state observable';end;