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function SIGN_FUN=sign_fun(s)
if s>=0
    SIGN_FUN=1;
else
    SIGN_FUN=-1;
end


%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%兩個M檔 貼在一起%%%%%%%%%%%%


function xdot=ztwoorder(t,x)

global u
xdot=[x(2);
      -1.5*x(2).^2+cos(3.*x(1))+u ];