Abstract
A necessary and sufficient condition is derived for the structural controllability for systems described by the following descriptor form
Kx=Ax+Bu
The descriptor form representation of systems has an advantage that it can reflect physical structure of real systems more directly than using usual state-space form.
The condition for the structural controllability is represented by means of Coates graph g[A B] and g[M N], where [M N] denotes a structured matrix which is uniquely determined by K, A, B.
