zeropen(1)

NAME
zeropen - zero pencil

CALLING SEQUENCE
[Z,U]=zeropen(Sl)

PARAMETERS

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

DESCRIPTION
Z = sE - F is the zero pencil of the linear system Sl with matrices [A,B,C,D].

With U row compression of [B;D] i.e, U*[B;D]=[0;*]; one has:
U*[-sI+A |B;   [ Z |0;
      C  |D] = [ * |*]
The zeros of Z are the zeros of Sl.

SEE ALSO
systmat, kroneck

AUTHOR
F. D.