 array, dimension (3)
          On input, IPAR(1) determines the actual state dimension,
          i.e., the order of the matrix A as follows, where
          NO = NR(1).NR(2).
          NR(1) = 1 or 2.1-2.8: IPAR(1) is ignored.
          NO = 2.9            : IPAR(1) = 1 generates the CARE for
                                optimal state feedback (default);
                                IPAR(1) = 2 generates the Kalman
                                filter CARE.
          NO = 3.1            : IPAR(1) 