How do I find the the zero state direction and the zero input direction of a transfer matrix in Matlab?

I want to compute using matlab the Rosenbrock System Matrix, and in particular I am trying to do a an analysis similar to the one at the end of http://people.duke.edu/~hpgavin/ce263/zeros.pdf . So, starting from a transfer matrix I would like to show that if there is a zero at a certain position, there is a zero blocking property.   To do so, as written in the link, I have to find the zeros state direction and the zero input direction, and I am having troubles doing do.   I am considering a different system from the one in the link, so I am trying to do a similar analysis applied to another system, and I am doing this:     s = tf('s');   P = 1/(s+5); C = 6/s;   S = 1/(1+P*C); T = P*C/(1+P*C);   G_2 = [T S; S -S]; %transfer matrix   Now, I have that my transfer matrix is :   G_2   and for it I would like to do the analysis to find the zero state diretion and the zero input direction, but I am having troubles doing so.   Can somebody please help me? Thanks in advance.