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408                             STATE SPACE ANALYSIS                           [CHAP.  7



                 (c)  By Eq. (7.44) the system function  H(z) is given by




















           7.36.  Consider the system in Prob. 7.7. Assume that




                 Find  x[O]  and  x[l] such that q[2] = 0.

                     From Eq. (7.23) we have




                 Thus,





                                                  j       x[ol
                                             = [: [m + :x[ol]
                                                   +
                 from which we obtain  x[O] = -  and  x[l] = i.


           7.37.  Consider the system in Prob. 7.7. We observe y[O]  = 1 and y[l] = 0 with x[O] = x[l] = 0.
                 Find the initial state q[O].
                     Using Eq. (7.1251, we have





                 Thus,





                 Solving for  ql[Ol and  q,[Ol,  we obtain
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