Computation of the structural invariants of linear multivariable systems with an extended version of the program zeros

The structural invariants like finite and infinite zeros play an important role in many problems in the analysis of linear systems. In [1] Emami-Naeini and Van Dooren presented the program zeros for computing the finite zeros of a linear system, which in the author's opinion is at present the best commonly available program for this problem. Such a program does not exist for computing the other structural invariants, like the infinite zeros and the Kronecker indices. This paper presents an extended version of the program zeros, which computes the finite zeros as well as the other structural invariants.