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Transfer function conversion from state-space looks like: G(s)=OUTPUT(s)/INPUT(s)=C*inv(s*I-A)*B+D, where s is the Laplace transform operator and I is the identity matrix (I=eye(size(A)) in MATLAB).
So if your B and D are equal to zero matrices, your G(s) is zero and you'll get a zero output with every input.
It is about the reason why you get zero output.
Thanks a lot!
it would be helpful to show how to get the (all) values of "t", at which the intersections occur.
Namely, two values of the parameter "t" correspond to each self-intersection.