       = 'L':  A is in lower Hessenberg form if ABSCHU = 'B' and
                  lower Schur form otherwise.

  ULB     CHARACTER*1
          Indicates whether B is in upper or lower Schur form or
          upper or lower Hessenberg form as follows:
          = 'U':  B is in upper Hessenberg form if ABSCHU = 'A' and
                  upper Schur form otherwise;
          = 'L':  B is in lower Hessenberg form if ABSCHU = 'A' and
                  lower Schur form otherwise.

</PRE>
<B>Input/Output Paramete