Matlab中switch语句编写 求助

function [Fx] = F(t0,t1,F0,F1,t)  
%F Summary of this function goes here
%   Detailed explanation goes here
switch (t)
    case (t<t1&&t>=t0)
        Fx=F0+((F1-F0)/(t1-t0))*(t-t0);
    case (t>=t1)
        Fx=0;
    otherwise
        disp('error')
end
本人是初学者，哪位大神帮忙看看我那错了？