y-M part of this array must
          contain the input/state matrix of the original system.
          On exit, the leading NR-by-M part of this array contains
          the input/state matrix Br of the reduced order system.

  LDB     INTEGER
          The leading dimension of array B.  LDB &gt;= MAX(1,N).

  C       (input/output) DOUBLE PRECISION array, dimension (LDC,N)
          On entry, the leading P-by-N part of this array must
          contain the state/output matrix of the original system.
      