r the
          linear part of the system, as specified above.
          This array need not be set on entry if INIT = 'B'.
          On exit, the elements 1 : lin2 of this array contain the
          optimal parameters for the nonlinear part followed by the
          optimal parameters for the linear part of the system, as
          specified above.

  LX      (input/output) INTEGER
          On entry, this parameter must contain the intended length
          of X. If N &gt;= 0, then LX &gt;= NX := lin2 (s