"+1">Purpose</FONT></B>
<PRE>
  To compute for given state-space representations
  (A,B,C,0), (AV,BV,CV,DV), and (AW,BW,CW,DW) of the
  transfer-function matrices G, V and W, respectively,
  the Cholesky factors of the frequency-weighted
  controllability and observability Grammians corresponding
  to a frequency-weighted model reduction problem.
  G, V and W must be stable transfer-function matrices with
  the state matrices A, AV, and AW in real Schur form.
  It is assumed that the state space realization