zeropen zero pencil [Z,U]=zeropen(Sl) Sl a linear system (syslin list in state-space form [A,B,C,D]) Z matrix pencil Z=s*E-A U square orthogonal matrix Z= sE - F is the zero pencil of the linear system Sl with matrices [A,B,C,D]. Utility function. With U row compression of [B;D] i.e, U*[B;D]=[0;*]; one has: The zeros of Z are the zeros of Sl. systmat kroneck