Some results on an inverse problem in multivariable systems

A systems property of great interest to the control engineer concerns the system's ability to exhibit those responses which are asked of it. This capability is governed by the nature of the system equations and the set of inputs which are available to 'force' the system. Given the set of desired system responses S
y
, and the system equations, this paper is concerned with characterizing the set of inputs which suffice to generate S
y
.