File: zeropen.cat

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zeropen(1)                     Scilab Function                     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]. Utility function.

  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