ONT SIZE="+1">Purpose</FONT></B>
<PRE>
  To reduce a complex matrix pair (A,B) in generalized complex
  Schur form to a block-diagonal form using well-conditioned
  non-unitary equivalence transformations. The condition numbers
  of the left and right transformations used for the reduction
  are roughly bounded by PMAX, where PMAX is a given value.
  The transformations are optionally postmultiplied in the given
  matrices X and Y. The generalized Schur form is optionally
  ordered, so that clustered eigenv