The function in octave tf2ss is supposed to build a state space representation of a system. What I don't understand is how to make it produce a system that has a NxN C matrix, ie a system that outputs more than just one value and thus consists of more than just one transfer function from input to output. For example state space system with two transfer functions such as
[1/s^2, 1/s] would be
A = [0, 1; 0, 0], B = [0; 1], C = eye(2), D = 0.
Perhaps there is some other method to combine multiple transfer functions into one system in octave?